1) The study surveyed the macrobenthic invertebrate composition, abundance, and distribution in three ponds in Agbede Flood Plain in southern Nigeria between January and June 2007.
2) A total of 10 taxa comprising 1,031 individuals were recorded. The most dominant groups were Coleopterans (35.79%), Hemiptera (20.19%), and Dipterans (18.47%).
3) Pond 2, which experienced no human activities, contained the highest number of macroinvertebrates (416), suggesting human activities can rapidly alter aquatic communities.
Physico-chemical parameters and macrobenthic invertebrates of the intertidal ...Angelo Mark Walag
Physico-chemical parameters and macrobenthic invertebrates of the intertidal zone of Gusa, Cagayan de Oro City, Philippines were assessed from March to May 2014. Water temperature, pH, salinity, dissolved oxygen, biological oxygen demand, and type of substrate were determined in the study were within the normal range. A modified transect-quadrat method was used in an approximately 14,000 m2 of study area. Seven hundred twenty seven individuals belonging to 15 species were found in the area. These organisms belong to four phyla namely: Mollusca, Arthropoda, Echinodermata, and Annelida. The three most abundant organisms found were Coenobita clypeatus, Ophiothrix longipeda, and Cypraea poraria with relative abundance of 73.86%, 4.13% and 3.71% respectively. Most of the macrobenthic fauna identified exhibited a clumped pattern of distribution, while the rest are randomly distributed. The species diversity of the area is 1.19 which is very low compared to reports from related studies.
Trends in Macrophyte Diversity in Anthropogenic Perturbed Lentic Ecosystems w...Premier Publishers
Aquatic macrophytes hold several niches within the ecosystem, including inter alia water purification, carbon sequestration and serve as microhabitats for aquatic insects. These dynamic roles make macrophytes good indicators of current environmental conditions. Hence assessing their abundance in line with wetland ecosystem dynamics and function is essential. Frequency of occurrence and density values were estimated, using twenty (20) 2 m x 2 m quadrats for each macrophyte encountered. The results of the study revealed twenty-one (21) macrophytes belonging to 16 families. These ponds varied markedly in terms of species composition and in numerical strength such that Polygonum lanigerum (1143+175st/ha), Setaria verticillata (337.5+ 32.8st/ha), Azolla pinnata (337.7+ 16.4 st/ha) recorded high density values while Lagenaria breviflora (18.7±2.19), Sida acuta (18.75±5.30), Ludwigia erecta (18.7±0.15) and Milletia aboensis (18.7±0.03) were the least abundant species. Pond A and D with 11 taxa each had the higher Shannon-Wiener (2.192, 2.214) and Simpson (0.8699, 0.8787) diversity indices respectively when compared to the other ponds. On the contrary, pond C with four taxa had the least Shannon-Wiener and Simpson diversity indices (1.253, 0.6782) respectively. Equitability and evenness ranged between 0.914 - 0. 952 and 0.814 - 0.900 respectively. Bray and Curtis cluster analysis showed that pond B was the most dissimilar compared to other ponds in terms of the taxa composition.
This document summarizes a study comparing the ecology of two ponds in southern India with different management practices. Water quality parameters and plant biodiversity were analyzed seasonally. One pond hosted migratory birds and was protected as a wildlife reserve, while the other was used for irrigation and faced more human impacts. Water quality varied between ponds, with higher sulfate levels in the migratory bird pond. More plant species and individuals were found in the protected pond, indicating it supported a more stable ecosystem. The study highlights the importance of understanding pond ecology in relation to utilization and management for conservation.
This document discusses a study that examined the potential for three species of aquatic macrophytes (Pista stratiotes, Spirodela intermedia, and Lemna minor) to simultaneously remove several heavy metals from water. In laboratory experiments, the macrophytes were exposed to varying concentrations of iron, copper, zinc, manganese, chromium, and lead over 15 days. High removal percentages for all three species and metals were observed. However, L. minor did not survive the experimental conditions. The rate of metal uptake by the macrophytes was dependent on the initial metal concentration. Overall, the study evaluated the macrophytes' ability to remove multiple heavy metals from water to help treat naturally polluted environments.
FLORAL DIVERSITY OF MANGROVE ECOSYSTEM FROM COASTAL ENVIRONMENT OF URAN (RAIG...Prabhakar Pawar
Mangrove forests are among the world’s most productive ecosystems and are the only forests situated at the confluence of land and sea in tropical and subtropical latitudes.Mangroves are one of the biologically diverse ecosystems in the world, rich in organic matter and nutrients and support very large biomass of flora and fauna. With continuing degradation and destruction ofmangroves, there is a critical need to understand the biodiversity of the mangrove ecosystems.Mangroves represent spirit of Mumbai and NaviMumbai - they are plucky survivors. Each day, millions of citizens in Mumbai pass these hardy plants imaging they are little more than dirty, muddy weeds growing pointlessly along the shoreline. Overexploitation and unsustainable demand has resulted in considerable degradation of mangrove areas and it is feared that the area under mangroves around Mumbai areas has dwindled by 35% in the last 25 years and only about 20 Km2 of mangroves exist today. During this study, 4 species of true
mangroves representing 3 genera and 3 families, 10 species of mangrove associates belonging to 8 genera and 6 families and 1 species of non-mangrove halophytes were recorded from the mangrove ecosystems of Uran (Raigad), Navi Mumbai,Maharashtra.At present, coastal environment of Uran shows moderate mangrove density but in coming few years, area around Uran coast will be dominated by intense industrialization and urbanization. In such circumstances, pollution of Uran coast cannot be ignored. Therefore, data presented in this paper can be taken as a base line data for better management of these natural resources.
Key words: Mangroves diversity, Uran, Navi Mumbai,Maharashtra
The multivariate statistical analysis of the environmental pollutants at lake...Alexander Decker
1. The document analyzes environmental pollutants in Lake Nyamagoma in Tanzania using multivariate statistical analysis of water samples collected from 8 sites during the wet season.
2. The results show variation in pollutant levels controlled by factors like primary productivity, redox conditions, dissolution, nitrification, denitrification, mixing, and reduction processes, as well as human activities in the area.
3. Four factors were extracted from the analysis: 1) high turbidity and primary productivity, 2) cation exchange processes, 3) variation in pollutants by depth and nutrients from the catchment, and 4) reduction processes and increased salinity.
Pollution assessment of ilokun in-used dumpsite, Ado Ekiti, NigeriaStephen Onyekachi
This document presents the results of a study on the impacts of heavy metals on macrobenthos biodiversity from a dumpsite in Ado Ekiti, Nigeria. Water and sediment samples were collected from 5 points around the dumpsite and analyzed for physicochemical properties and heavy metal concentrations. The study found high levels of cadmium, iron and copper near the dumpsite that decreased further away. A total of 9 macrobenthos species were identified, with some tolerant species like flies and bloodworms found near the dumpsite. The results indicate that heavy metals from the dumpsite are impacting local water and sediment quality and macrobenthos biodiversity.
Physico-chemical parameters and macrobenthic invertebrates of the intertidal ...Angelo Mark Walag
Physico-chemical parameters and macrobenthic invertebrates of the intertidal zone of Gusa, Cagayan de Oro City, Philippines were assessed from March to May 2014. Water temperature, pH, salinity, dissolved oxygen, biological oxygen demand, and type of substrate were determined in the study were within the normal range. A modified transect-quadrat method was used in an approximately 14,000 m2 of study area. Seven hundred twenty seven individuals belonging to 15 species were found in the area. These organisms belong to four phyla namely: Mollusca, Arthropoda, Echinodermata, and Annelida. The three most abundant organisms found were Coenobita clypeatus, Ophiothrix longipeda, and Cypraea poraria with relative abundance of 73.86%, 4.13% and 3.71% respectively. Most of the macrobenthic fauna identified exhibited a clumped pattern of distribution, while the rest are randomly distributed. The species diversity of the area is 1.19 which is very low compared to reports from related studies.
Trends in Macrophyte Diversity in Anthropogenic Perturbed Lentic Ecosystems w...Premier Publishers
Aquatic macrophytes hold several niches within the ecosystem, including inter alia water purification, carbon sequestration and serve as microhabitats for aquatic insects. These dynamic roles make macrophytes good indicators of current environmental conditions. Hence assessing their abundance in line with wetland ecosystem dynamics and function is essential. Frequency of occurrence and density values were estimated, using twenty (20) 2 m x 2 m quadrats for each macrophyte encountered. The results of the study revealed twenty-one (21) macrophytes belonging to 16 families. These ponds varied markedly in terms of species composition and in numerical strength such that Polygonum lanigerum (1143+175st/ha), Setaria verticillata (337.5+ 32.8st/ha), Azolla pinnata (337.7+ 16.4 st/ha) recorded high density values while Lagenaria breviflora (18.7±2.19), Sida acuta (18.75±5.30), Ludwigia erecta (18.7±0.15) and Milletia aboensis (18.7±0.03) were the least abundant species. Pond A and D with 11 taxa each had the higher Shannon-Wiener (2.192, 2.214) and Simpson (0.8699, 0.8787) diversity indices respectively when compared to the other ponds. On the contrary, pond C with four taxa had the least Shannon-Wiener and Simpson diversity indices (1.253, 0.6782) respectively. Equitability and evenness ranged between 0.914 - 0. 952 and 0.814 - 0.900 respectively. Bray and Curtis cluster analysis showed that pond B was the most dissimilar compared to other ponds in terms of the taxa composition.
This document summarizes a study comparing the ecology of two ponds in southern India with different management practices. Water quality parameters and plant biodiversity were analyzed seasonally. One pond hosted migratory birds and was protected as a wildlife reserve, while the other was used for irrigation and faced more human impacts. Water quality varied between ponds, with higher sulfate levels in the migratory bird pond. More plant species and individuals were found in the protected pond, indicating it supported a more stable ecosystem. The study highlights the importance of understanding pond ecology in relation to utilization and management for conservation.
This document discusses a study that examined the potential for three species of aquatic macrophytes (Pista stratiotes, Spirodela intermedia, and Lemna minor) to simultaneously remove several heavy metals from water. In laboratory experiments, the macrophytes were exposed to varying concentrations of iron, copper, zinc, manganese, chromium, and lead over 15 days. High removal percentages for all three species and metals were observed. However, L. minor did not survive the experimental conditions. The rate of metal uptake by the macrophytes was dependent on the initial metal concentration. Overall, the study evaluated the macrophytes' ability to remove multiple heavy metals from water to help treat naturally polluted environments.
FLORAL DIVERSITY OF MANGROVE ECOSYSTEM FROM COASTAL ENVIRONMENT OF URAN (RAIG...Prabhakar Pawar
Mangrove forests are among the world’s most productive ecosystems and are the only forests situated at the confluence of land and sea in tropical and subtropical latitudes.Mangroves are one of the biologically diverse ecosystems in the world, rich in organic matter and nutrients and support very large biomass of flora and fauna. With continuing degradation and destruction ofmangroves, there is a critical need to understand the biodiversity of the mangrove ecosystems.Mangroves represent spirit of Mumbai and NaviMumbai - they are plucky survivors. Each day, millions of citizens in Mumbai pass these hardy plants imaging they are little more than dirty, muddy weeds growing pointlessly along the shoreline. Overexploitation and unsustainable demand has resulted in considerable degradation of mangrove areas and it is feared that the area under mangroves around Mumbai areas has dwindled by 35% in the last 25 years and only about 20 Km2 of mangroves exist today. During this study, 4 species of true
mangroves representing 3 genera and 3 families, 10 species of mangrove associates belonging to 8 genera and 6 families and 1 species of non-mangrove halophytes were recorded from the mangrove ecosystems of Uran (Raigad), Navi Mumbai,Maharashtra.At present, coastal environment of Uran shows moderate mangrove density but in coming few years, area around Uran coast will be dominated by intense industrialization and urbanization. In such circumstances, pollution of Uran coast cannot be ignored. Therefore, data presented in this paper can be taken as a base line data for better management of these natural resources.
Key words: Mangroves diversity, Uran, Navi Mumbai,Maharashtra
The multivariate statistical analysis of the environmental pollutants at lake...Alexander Decker
1. The document analyzes environmental pollutants in Lake Nyamagoma in Tanzania using multivariate statistical analysis of water samples collected from 8 sites during the wet season.
2. The results show variation in pollutant levels controlled by factors like primary productivity, redox conditions, dissolution, nitrification, denitrification, mixing, and reduction processes, as well as human activities in the area.
3. Four factors were extracted from the analysis: 1) high turbidity and primary productivity, 2) cation exchange processes, 3) variation in pollutants by depth and nutrients from the catchment, and 4) reduction processes and increased salinity.
Pollution assessment of ilokun in-used dumpsite, Ado Ekiti, NigeriaStephen Onyekachi
This document presents the results of a study on the impacts of heavy metals on macrobenthos biodiversity from a dumpsite in Ado Ekiti, Nigeria. Water and sediment samples were collected from 5 points around the dumpsite and analyzed for physicochemical properties and heavy metal concentrations. The study found high levels of cadmium, iron and copper near the dumpsite that decreased further away. A total of 9 macrobenthos species were identified, with some tolerant species like flies and bloodworms found near the dumpsite. The results indicate that heavy metals from the dumpsite are impacting local water and sediment quality and macrobenthos biodiversity.
Surface and ground water pollution in abata ogun agricultural wetlandAlexander Decker
The document summarizes a study assessing the effect of organic and inorganic fertilizer application on surface and ground water quality in Abata Ogun agricultural wetland in Nigeria. Water sampling during rainy and dry seasons found high concentrations of nutrients, bacteria, and other pollutants indicating contamination from agricultural activities. Wells and streams on the farm had lower water quality than the control well, with measurements exceeding standards. The wetland's stream deposited sediments and contamination spread downstream. The study highlights the need for awareness and sustainable farming practices to prevent health risks from consuming contaminated water.
This document provides notes on ecosystems compiled by Dr. G Subbarao for environmental science students. It defines key ecosystem concepts like producers, consumers, decomposers, food chains, and food webs. It also explains ecological pyramids and how they illustrate the transfer of energy and biomass between trophic levels. Examples are given of various natural ecosystems like forests, grasslands, ponds, and oceans. Energy flow through ecosystems is described, with the sun as the main source of energy and photosynthesis enabling its transfer and transformation through food webs.
Effects of inorganic nutrient P and N application on Azolla biomass growth an...Innspub Net
This study examined the effects of phosphorus (P) and nitrogen (N) application on Azolla biomass growth and nutrient uptake. Azolla samples were collected from six major rice growing regions in Kenya and grown in plastic pots with varying levels of P (0 or 3 mg/L) and N (0 or 200 mg/L) added to the irrigation water. Biomass accumulation and doubling time were measured over 10 days. Application of N and P significantly reduced Azolla biomass accumulation and increased doubling time. Tissue N and P content in Azolla and irrigation water nutrient levels also varied between regions. The study provides information on how external nutrient levels affect Azolla growth.
Traced metals and nutrients in mosquito breeding sites at the obuasi municip...Alexander Decker
1. The document summarizes a study that assessed trace metals and nutrients in mosquito breeding sites in Obuasi, Ghana. Water samples were collected fortnightly from 15 sites for 8 months and analyzed for iron, lead, arsenic, zinc, nitrates, sulfates, and phosphates.
2. The results found iron ranged from 0.12-13.42 mg/L, lead ranged from 0.01-0.30 mg/L, and arsenic and zinc were not detected. Nitrates were above 1 mg/L, sulfates exceeded limits in some sites, and phosphates varied between 0.1-1.5 mg/L.
3. The concentrations
Determination of mercury level in rana esculenta (frog), sediment and water f...Alexander Decker
1) The study measured mercury levels in edible frogs (Rana esculenta), sediment, and water from the River Guma in Benue State, Nigeria over three months.
2) Mercury levels were highest in frog livers, followed by intestines and muscles. No mercury was detected in the water.
3) Mercury concentrations in frog tissues were above the recommended WHO value but below levels that would pose health risks. The results indicate bioaccumulation of mercury in the food chain.
Development of sawdust from the Lagos Lagoon in Nigeria as a renewable feedst...Innspub Net
The accumulation of solid waste and consumption of fossil fuels are two phenomenons which already have a major destructive effect on the environment. The lack of alternative solid waste management procedures and shortage of the development of renewable energy resources should be addressed in order to sustain environmental quality. Sawdust is a major waste product along the Lagos lagoon with cellulose one of the predominant structural components of sawdust. The bio-conversion of waste cellulose, a glucose biopolymer into glucose a fermentable sugar has been performed with cellulase from Aspergillus Niger. Delignified and non-delignified sawdust from five different trees along the Lagos Lagoon have been saccharified with A. niger cellulase. The saccharification of these sawdust materials have been performed at different incubation temperatures of 30°C, 40°C, 50°C and 60°C. Optimum saccharification of non-delignified and delignified cellulose from the various trees along the Lagos Lagoon were optimum saccharified at different temperatures resulting in different sugar concentrations produced. A temperature of 40°C was optimum for maximum degradation of non-delignified cellulose from all the trees producing sugar at concentration between 3.0 – 4.3mg.ml-1. Optimum saccharification of delignified cellulose from all the trees was obtained at a temperature of 50°C resulting in a sugar concentration of 5.9 – 8.4mg.ml-1.
This document discusses biodiversity, including the variety of living things, ecological diversity through different habitats and species interactions, and genetic diversity within populations. It notes the benefits of biodiversity, such as ecosystem functions, services like cleaning water and air, and providing habitat for wildlife. Biodiversity also provides resources like new food sources, medicines from plants and marine organisms. However, biodiversity is threatened by extinction and population reductions due to hunting, habitat loss, pollution, climate change, and invasive species. Ways to protect biodiversity discussed include sustainable harvesting, establishing protected areas, and legislation like the Endangered Species Act.
The document discusses biodiversity at three hierarchical levels - genetic, species, and ecological diversity. It provides examples of genetic diversity within different species. Species diversity depends on the number and richness of species in a region. Ecological diversity includes different ecosystem types. Tropical regions generally have higher biodiversity than temperate or polar areas. Species richness increases with area up to a limit based on species-area relationships. The document outlines threats to biodiversity from habitat loss, overexploitation, invasive species, and co-extinctions.
Analyses of Community Attributes of Meiofauna Under A Pollution Regime in the...Agriculture Journal IJOEAR
— Meiofauna community attributes of the lower Bonny estuary was investigated under a pollution regime. This is germane because of the strategic importance of meiofauna in the food chain and the sustenance of any aquatic ecosystem. Five stations representing diverse land based activities such as refuse dump site, fuel depot, fishing-landing areas, residential housing and a station located upstream (control) were chosen for investigation. The meiofauna samples were collected from sediments in three replicate spots per station per sampling months at low tide. Sediment samples were stirred through (63-212nm) meshes to separate meiofauna and organic debris. Meiofauna samples were processed by first washing Meiofauna through a sieve of fine mesh size made of silk material, in order to wash off formation and excess silt or mud. Meiofauna samples were sorted out and identified using standard keys. Result from field studies indicate that meiofauna population abundance and diversity varied slightly between stations and seasons. There was however, no established trend. Meiofauna were generally more abundant in the rainy season than in the dry season. In general, pollution indicator meiofaunal taxa were more in all stations except the control station; the increasing impact of pollutants in the river led to a rise in the relative abundance of r-strategist genera like Chromadora. We conclude that the application of meiofaunal indices can be a useful tool for assessing the environmental quality of estuarine ecosystems.
first record of emys orbicularis (boulenger, 1882), (reptilia, testudinati)IJEAB
Five specimens of the European Pond Terrapin (Emys orbicularis) were discovered in May 2015 in a ditch within the Castel di Guido Natural Park in northern Latium, Italy. This represents the first recorded sighting of the species in this area, which has been monitored since 2006. The discovery of individuals of varying sizes, including a newborn, suggests a reproductive population has become established. It is believed the terrapins recently colonized this site from an existing population five kilometers away, demonstrating the species' ability to traverse degraded urban environments. This first documentation of E. orbicularis in the Castel di Guido Natural Park provides new information about the status and conservation of the species in the region
This document provides information about Dr. T. Citarasu and his research interests in marine ecosystem and marine biotechnology at Manonmaniam Sundaranar University. It discusses how the ocean contributes to the climate and is home to most life on Earth. It also outlines various applications of marine biotechnology including medicines, cosmetics, nutraceuticals, enzymes, fuels, foods and more. The document then discusses different sources of marine natural products including microbes, fungi, invertebrates like sponges, cnidarians, annelids, arthropods, molluscs and echinoderms. It provides several examples of bioactive compounds isolated from these marine sources and their activities.
A preliminary survey of gastrointestinal parasites of animals inAlexander Decker
This study surveyed gastrointestinal parasites in 18 animal species at the Federal University of Agriculture
Abeokuta Zoological Park in Nigeria. Fecal samples collected from April to July 2014 were examined
microscopically and 7 parasite species were identified, with hookworm being the most prevalent at 22.2%. Of the
animals surveyed, 55.6% were infected with at least one parasite. Non-human primates had the highest infection
rates and intensities. The study recommends routine deworming and improved hygiene to control parasite
transmission between animals and humans at the zoo.
Potentially harmful algae along the kenyan coast a norm or threat.Alexander Decker
This document summarizes a study of potentially harmful algal species along the Kenyan coast from 2009-2010. A total of 39 potentially harmful algal taxa were observed over the study period. The taxa with the highest abundances were Chaetoceros sp., Nitzschia sp., Coscinodiscus sp., Pseudo-nitzschia sp., Rhizosolenia sp., Anabaena sp., Protoperidinium sp., Oscillatoria sp. and Trichodesnium sp. whereas the lowest abundances were Fibrocapsa sp., Chrysochromulina sp., Umezakia sp., Dinophysis sp. and Aphanizomenom sp. The
Assessment of aquaculture sediment for agricultural fertilizer supplement and...researchagriculture
Overuse of farmlands for crop production and rising cost of chemical Overuse of farmlands for crop production and rising cost of chemical fertilizers have grossly affected crop yield, production and food availability, and the search for alternative use of locally available aquaculture-waste for fertilizer and soil improvement can improve crop yield and food availability for the teaming population of Nigeria and other sub-Saharan African countries. This research determined the pH, Organic Matter, nitrate and phosphate qualities of 10 fishpond sediments for use as agricultural fertilizer supplement and soil conditioner in Owerri, Nigeria. Samples were subjected to standard physicochemical analysis. The pH ranged from 8.1-7.3, organic matter from 46.6-61.3 g/kg, nitrate from 2.6-3.2 g/kg and phosphate from 0.05-0.1 g/kg. The higher the organic matter in the sediment samples, the higher the recorded pH, nitrate and phosphate from the different ponds sediments. Organic material, nitrate, phosphate and pH variation in the sediments might be due to nutrients added to pond water from fertilizer, unconsumed feed, fish feaces and metabolites. The nitrate and phosphate are major plant nutrients; organic matter can be used as soil conditioner. The pH can determine the soil chemistry and availability of the nutrients. The fish pond sediment can help to improve soil texture and soil fertility, which may influence soil aeration, water, and nutrient-holding capacity and root penetration by crops and increased crops growth and yield. It can serve as alternative uses for fertilizer, soil conditioner, and its application as a waste management approach in aquaculture for environmental sustainability.
Article Citation:
Ihejirika CE, Onwudike SU, Nwaogu LA, Emereibeole EI, Ebe TE and Ejiogu CC.
Assessment of aquaculture sediment for agricultural fertilizer supplement and soil conditioner in Owerri Urban, Nigeria.
Journal of Research in Agriculture (2012) 1(1): 034-038.
Full Text:
http://www.jagri.info/documents/AG0009.pdf
Assessment of aquaculture sediment for agricultural fertilizer supplement an...researchagriculture
Overuse of farmlands for crop production and rising cost of chemical
Overuse of farmlands for crop production and rising cost of chemical fertilizers have
grossly affected crop yield, production and food availability, and the search for
alternative use of locally available aquaculture
-
waste for fertilizer and soil
improvement can improve crop yield and food availability for the teaming population
of Nigeria and other sub
-
Saharan African countries. This research determined the pH,
Organic Matter, nitrate and phosphate qualities of 10 fishpond sediments for use as
agricultural fertilizer supplement and soil conditioner in Owerri, Nigeria. Samples
were subjected to standard physicochemical analysis. The pH ranged from 8.1
-
7.3,
organic matter from 46.6
-
61.3 g/kg, nitrate from 2.6
-
3.2 g/kg and phosphate from
0.05
-
0.1 g/kg. The higher the organic matter in the sediment samples, the higher the
recorded pH, nitrate and phosphate from the different ponds sediments. Organic
material, nitrate, phosphate and pH variation in the sediments might be due to
nutrients added to pond water from fertilizer, unconsumed feed, fish feaces and
metabolites. The nitrate and phosphate are major plant nutrients; organic matter can
be used as soil conditioner. The pH can determine the soil chemistry and availability
of the nutrients. The fish pond sediment can help to improve soil texture and soil
fertility, which may influence soil aeration, water, and nutrient
-
holding capacity and
root penetration by crops and increased crops growth and yield. It can serve as
alternative uses for fertilizer, soil conditioner, and its application as a waste
management approach in aquaculture for environmental sustainability.
This document discusses ecological concepts such as mortality, r-selected species, habitat, ecological niche, and carrying capacity. It defines mortality as the rate at which individuals die in a population. R-selected species are those that live in environments below carrying capacity and can grow rapidly when conditions are favorable. Habitat refers to where an organism lives, while ecological niche describes its role in an ecosystem. Niche can be defined by variables like temperature and resources. Carrying capacity is the maximum population size an environment can sustain indefinitely.
This study examines the physicochemical controls on the transport of veterinary pharmaceuticals and hormones from animal manures to surface waters. The researchers investigated the long-term sorption kinetics of the antibiotic lincomycin on various biochars derived from animal manures. They also studied the sorption and transport of the hormone 17β-estradiol on biochars using batch experiments and fixed-bed column experiments. The results showed fast initial surface sorption and slower long-term pore diffusion of lincomycin onto the biochars. Additionally, biochar had a greater sorption capacity for 17β-estradiol than sand and reduced its transport compared to biochar-free sand in column experiments.
This document provides information on various types of ecosystems. It begins by defining an ecosystem as the organisms living in a given area and how they interact with abiotic factors. It then discusses energy flow through food chains and food webs. Major ecosystem types described include forests, grasslands, deserts, tundra, freshwater, and marine ecosystems. The document also covers biogeochemical cycles, succession, and renewable and non-renewable energy resources.
Methods of measuring biodiversity Biodiversity indexLekhan Lodhi
Scientists use several methods to measure biodiversity, including canopy fogging, quadrat sampling, transect sampling, and netting. The method used depends on the types of organisms being counted and the habitat. To protect biodiversity, scientists document species identities and locations in museum collections and computer databases. Analyzing species distributions has identified "biodiversity hotspots" with exceptionally high diversity in small areas.
Biodiversity = Science, Technology and Society Group-2jammellcerezo
Biodiversity refers to the variety of life on Earth, including diversity within and between species and ecosystems. It provides many benefits like food, clean water, climate regulation, and cultural services. There are three main types of biodiversity: genetic diversity within species, species diversity between species, and ecosystem diversity between ecosystems. Biodiversity is threatened by habitat loss, pollution, climate change, and other human activities. Protected areas aim to conserve biodiversity by limiting human impacts and regulating activities like hunting, grazing, and forestry within areas like national parks, wildlife sanctuaries, and forest reserves.
3 ijfaf jul-2017-1-evaluation of the ichthyofaunalAI Publications
Fish constitute more than half of the total number of all the aquatic vertebrates in the world; thus, a study was carried out for six months from January-June, 2016 to investigate the physico-chemical parameters, composition, abundance and diversity of ichthyofauna present in some sections of Omambala, Ezu and Ahommiri Rivers in Anambra state, Nigeria. Water samples were collected for physico-chemical analysis and fish samples were also collected with the assistance of artisanal fishermen using different types of traditional fishing gears namely - gill nets, cast nets, hook and line, local traps (baited) and bag nets to evaluate fish species composition and abundance. The result of the physico-chemical analysis showed uniform values for temperature (25±0.16oC-30±0.48oC), dissolved oxygen (3.65±0.78-5.65±0.11mg/l) and biochemical oxygen demand (13±0.03-16±0.08mg/l) which favoured the distribution of fishes present in different sections of the three Rivers. A total catch of 11,031 fishes were recorded from the three Rivers which comprised 11 orders, 29 families, 43 genera and 69 species. Umuoba-Anam section had 9691 catches, Ebenebe section (702) and Awa section (638). Monthly composition showed highest in March (1,909) and June (2,294) for dry and rainy seasons respectively. Seasonal composition showed highest during the rainy season with a total number of 5922 fishes while 5109 fishes was recorded for the dry season. The diversity indices of the three Rivers indicated diverse communities with ten common species variety and Shannon Weiner (H’) diversity index of 2.755-3.682. Tilapia zilli (22.2%) was the most common and abundant species followed by Clarias anguillaris (21.4%), Malapterus electricus (18.9%), Heterobranchus bidorsalis (15.4%), Xenomystis nigri (14.6%), Heterotis niloticus (13.0%), Auchenoglanis monkei (11.0%), Tilapia dageti (10.2%), Hepsetus odoe (8.1%) and Bagrus filamentosus (7.2%). The study revealed that taxa richness and species diversity increase with increased water level and uniform physico-chemical changes. Further survey of fish species diversity and abundance should be carried out continuously for a longer period on a larger scale for a thorough assessment of the water bodies and their fishery potentials.
Aspects of the Geomorphology and Limnology of some molluscinhabited freshwate...iosrjce
This document summarizes a study of the geomorphology and limnology of 25 freshwater bodies in northern Nigeria that are inhabited by molluscs. A total of 14 mollusc species from 9 families were found across the water bodies. Measurements of the water bodies showed variations in elevation, size, substrate, and vegetation. Water quality parameters like temperature, pH, dissolved oxygen, alkalinity, and hardness also varied significantly between sites. Linear regression analysis revealed relationships between elevation and other factors. Canonical correspondence analysis established relationships between mollusc distributions and environmental characteristics. The study provides information on the habitats and water quality conditions of mollusc-inhabited freshwaters in northern Nigeria.
Surface and ground water pollution in abata ogun agricultural wetlandAlexander Decker
The document summarizes a study assessing the effect of organic and inorganic fertilizer application on surface and ground water quality in Abata Ogun agricultural wetland in Nigeria. Water sampling during rainy and dry seasons found high concentrations of nutrients, bacteria, and other pollutants indicating contamination from agricultural activities. Wells and streams on the farm had lower water quality than the control well, with measurements exceeding standards. The wetland's stream deposited sediments and contamination spread downstream. The study highlights the need for awareness and sustainable farming practices to prevent health risks from consuming contaminated water.
This document provides notes on ecosystems compiled by Dr. G Subbarao for environmental science students. It defines key ecosystem concepts like producers, consumers, decomposers, food chains, and food webs. It also explains ecological pyramids and how they illustrate the transfer of energy and biomass between trophic levels. Examples are given of various natural ecosystems like forests, grasslands, ponds, and oceans. Energy flow through ecosystems is described, with the sun as the main source of energy and photosynthesis enabling its transfer and transformation through food webs.
Effects of inorganic nutrient P and N application on Azolla biomass growth an...Innspub Net
This study examined the effects of phosphorus (P) and nitrogen (N) application on Azolla biomass growth and nutrient uptake. Azolla samples were collected from six major rice growing regions in Kenya and grown in plastic pots with varying levels of P (0 or 3 mg/L) and N (0 or 200 mg/L) added to the irrigation water. Biomass accumulation and doubling time were measured over 10 days. Application of N and P significantly reduced Azolla biomass accumulation and increased doubling time. Tissue N and P content in Azolla and irrigation water nutrient levels also varied between regions. The study provides information on how external nutrient levels affect Azolla growth.
Traced metals and nutrients in mosquito breeding sites at the obuasi municip...Alexander Decker
1. The document summarizes a study that assessed trace metals and nutrients in mosquito breeding sites in Obuasi, Ghana. Water samples were collected fortnightly from 15 sites for 8 months and analyzed for iron, lead, arsenic, zinc, nitrates, sulfates, and phosphates.
2. The results found iron ranged from 0.12-13.42 mg/L, lead ranged from 0.01-0.30 mg/L, and arsenic and zinc were not detected. Nitrates were above 1 mg/L, sulfates exceeded limits in some sites, and phosphates varied between 0.1-1.5 mg/L.
3. The concentrations
Determination of mercury level in rana esculenta (frog), sediment and water f...Alexander Decker
1) The study measured mercury levels in edible frogs (Rana esculenta), sediment, and water from the River Guma in Benue State, Nigeria over three months.
2) Mercury levels were highest in frog livers, followed by intestines and muscles. No mercury was detected in the water.
3) Mercury concentrations in frog tissues were above the recommended WHO value but below levels that would pose health risks. The results indicate bioaccumulation of mercury in the food chain.
Development of sawdust from the Lagos Lagoon in Nigeria as a renewable feedst...Innspub Net
The accumulation of solid waste and consumption of fossil fuels are two phenomenons which already have a major destructive effect on the environment. The lack of alternative solid waste management procedures and shortage of the development of renewable energy resources should be addressed in order to sustain environmental quality. Sawdust is a major waste product along the Lagos lagoon with cellulose one of the predominant structural components of sawdust. The bio-conversion of waste cellulose, a glucose biopolymer into glucose a fermentable sugar has been performed with cellulase from Aspergillus Niger. Delignified and non-delignified sawdust from five different trees along the Lagos Lagoon have been saccharified with A. niger cellulase. The saccharification of these sawdust materials have been performed at different incubation temperatures of 30°C, 40°C, 50°C and 60°C. Optimum saccharification of non-delignified and delignified cellulose from the various trees along the Lagos Lagoon were optimum saccharified at different temperatures resulting in different sugar concentrations produced. A temperature of 40°C was optimum for maximum degradation of non-delignified cellulose from all the trees producing sugar at concentration between 3.0 – 4.3mg.ml-1. Optimum saccharification of delignified cellulose from all the trees was obtained at a temperature of 50°C resulting in a sugar concentration of 5.9 – 8.4mg.ml-1.
This document discusses biodiversity, including the variety of living things, ecological diversity through different habitats and species interactions, and genetic diversity within populations. It notes the benefits of biodiversity, such as ecosystem functions, services like cleaning water and air, and providing habitat for wildlife. Biodiversity also provides resources like new food sources, medicines from plants and marine organisms. However, biodiversity is threatened by extinction and population reductions due to hunting, habitat loss, pollution, climate change, and invasive species. Ways to protect biodiversity discussed include sustainable harvesting, establishing protected areas, and legislation like the Endangered Species Act.
The document discusses biodiversity at three hierarchical levels - genetic, species, and ecological diversity. It provides examples of genetic diversity within different species. Species diversity depends on the number and richness of species in a region. Ecological diversity includes different ecosystem types. Tropical regions generally have higher biodiversity than temperate or polar areas. Species richness increases with area up to a limit based on species-area relationships. The document outlines threats to biodiversity from habitat loss, overexploitation, invasive species, and co-extinctions.
Analyses of Community Attributes of Meiofauna Under A Pollution Regime in the...Agriculture Journal IJOEAR
— Meiofauna community attributes of the lower Bonny estuary was investigated under a pollution regime. This is germane because of the strategic importance of meiofauna in the food chain and the sustenance of any aquatic ecosystem. Five stations representing diverse land based activities such as refuse dump site, fuel depot, fishing-landing areas, residential housing and a station located upstream (control) were chosen for investigation. The meiofauna samples were collected from sediments in three replicate spots per station per sampling months at low tide. Sediment samples were stirred through (63-212nm) meshes to separate meiofauna and organic debris. Meiofauna samples were processed by first washing Meiofauna through a sieve of fine mesh size made of silk material, in order to wash off formation and excess silt or mud. Meiofauna samples were sorted out and identified using standard keys. Result from field studies indicate that meiofauna population abundance and diversity varied slightly between stations and seasons. There was however, no established trend. Meiofauna were generally more abundant in the rainy season than in the dry season. In general, pollution indicator meiofaunal taxa were more in all stations except the control station; the increasing impact of pollutants in the river led to a rise in the relative abundance of r-strategist genera like Chromadora. We conclude that the application of meiofaunal indices can be a useful tool for assessing the environmental quality of estuarine ecosystems.
first record of emys orbicularis (boulenger, 1882), (reptilia, testudinati)IJEAB
Five specimens of the European Pond Terrapin (Emys orbicularis) were discovered in May 2015 in a ditch within the Castel di Guido Natural Park in northern Latium, Italy. This represents the first recorded sighting of the species in this area, which has been monitored since 2006. The discovery of individuals of varying sizes, including a newborn, suggests a reproductive population has become established. It is believed the terrapins recently colonized this site from an existing population five kilometers away, demonstrating the species' ability to traverse degraded urban environments. This first documentation of E. orbicularis in the Castel di Guido Natural Park provides new information about the status and conservation of the species in the region
This document provides information about Dr. T. Citarasu and his research interests in marine ecosystem and marine biotechnology at Manonmaniam Sundaranar University. It discusses how the ocean contributes to the climate and is home to most life on Earth. It also outlines various applications of marine biotechnology including medicines, cosmetics, nutraceuticals, enzymes, fuels, foods and more. The document then discusses different sources of marine natural products including microbes, fungi, invertebrates like sponges, cnidarians, annelids, arthropods, molluscs and echinoderms. It provides several examples of bioactive compounds isolated from these marine sources and their activities.
A preliminary survey of gastrointestinal parasites of animals inAlexander Decker
This study surveyed gastrointestinal parasites in 18 animal species at the Federal University of Agriculture
Abeokuta Zoological Park in Nigeria. Fecal samples collected from April to July 2014 were examined
microscopically and 7 parasite species were identified, with hookworm being the most prevalent at 22.2%. Of the
animals surveyed, 55.6% were infected with at least one parasite. Non-human primates had the highest infection
rates and intensities. The study recommends routine deworming and improved hygiene to control parasite
transmission between animals and humans at the zoo.
Potentially harmful algae along the kenyan coast a norm or threat.Alexander Decker
This document summarizes a study of potentially harmful algal species along the Kenyan coast from 2009-2010. A total of 39 potentially harmful algal taxa were observed over the study period. The taxa with the highest abundances were Chaetoceros sp., Nitzschia sp., Coscinodiscus sp., Pseudo-nitzschia sp., Rhizosolenia sp., Anabaena sp., Protoperidinium sp., Oscillatoria sp. and Trichodesnium sp. whereas the lowest abundances were Fibrocapsa sp., Chrysochromulina sp., Umezakia sp., Dinophysis sp. and Aphanizomenom sp. The
Assessment of aquaculture sediment for agricultural fertilizer supplement and...researchagriculture
Overuse of farmlands for crop production and rising cost of chemical Overuse of farmlands for crop production and rising cost of chemical fertilizers have grossly affected crop yield, production and food availability, and the search for alternative use of locally available aquaculture-waste for fertilizer and soil improvement can improve crop yield and food availability for the teaming population of Nigeria and other sub-Saharan African countries. This research determined the pH, Organic Matter, nitrate and phosphate qualities of 10 fishpond sediments for use as agricultural fertilizer supplement and soil conditioner in Owerri, Nigeria. Samples were subjected to standard physicochemical analysis. The pH ranged from 8.1-7.3, organic matter from 46.6-61.3 g/kg, nitrate from 2.6-3.2 g/kg and phosphate from 0.05-0.1 g/kg. The higher the organic matter in the sediment samples, the higher the recorded pH, nitrate and phosphate from the different ponds sediments. Organic material, nitrate, phosphate and pH variation in the sediments might be due to nutrients added to pond water from fertilizer, unconsumed feed, fish feaces and metabolites. The nitrate and phosphate are major plant nutrients; organic matter can be used as soil conditioner. The pH can determine the soil chemistry and availability of the nutrients. The fish pond sediment can help to improve soil texture and soil fertility, which may influence soil aeration, water, and nutrient-holding capacity and root penetration by crops and increased crops growth and yield. It can serve as alternative uses for fertilizer, soil conditioner, and its application as a waste management approach in aquaculture for environmental sustainability.
Article Citation:
Ihejirika CE, Onwudike SU, Nwaogu LA, Emereibeole EI, Ebe TE and Ejiogu CC.
Assessment of aquaculture sediment for agricultural fertilizer supplement and soil conditioner in Owerri Urban, Nigeria.
Journal of Research in Agriculture (2012) 1(1): 034-038.
Full Text:
http://www.jagri.info/documents/AG0009.pdf
Assessment of aquaculture sediment for agricultural fertilizer supplement an...researchagriculture
Overuse of farmlands for crop production and rising cost of chemical
Overuse of farmlands for crop production and rising cost of chemical fertilizers have
grossly affected crop yield, production and food availability, and the search for
alternative use of locally available aquaculture
-
waste for fertilizer and soil
improvement can improve crop yield and food availability for the teaming population
of Nigeria and other sub
-
Saharan African countries. This research determined the pH,
Organic Matter, nitrate and phosphate qualities of 10 fishpond sediments for use as
agricultural fertilizer supplement and soil conditioner in Owerri, Nigeria. Samples
were subjected to standard physicochemical analysis. The pH ranged from 8.1
-
7.3,
organic matter from 46.6
-
61.3 g/kg, nitrate from 2.6
-
3.2 g/kg and phosphate from
0.05
-
0.1 g/kg. The higher the organic matter in the sediment samples, the higher the
recorded pH, nitrate and phosphate from the different ponds sediments. Organic
material, nitrate, phosphate and pH variation in the sediments might be due to
nutrients added to pond water from fertilizer, unconsumed feed, fish feaces and
metabolites. The nitrate and phosphate are major plant nutrients; organic matter can
be used as soil conditioner. The pH can determine the soil chemistry and availability
of the nutrients. The fish pond sediment can help to improve soil texture and soil
fertility, which may influence soil aeration, water, and nutrient
-
holding capacity and
root penetration by crops and increased crops growth and yield. It can serve as
alternative uses for fertilizer, soil conditioner, and its application as a waste
management approach in aquaculture for environmental sustainability.
This document discusses ecological concepts such as mortality, r-selected species, habitat, ecological niche, and carrying capacity. It defines mortality as the rate at which individuals die in a population. R-selected species are those that live in environments below carrying capacity and can grow rapidly when conditions are favorable. Habitat refers to where an organism lives, while ecological niche describes its role in an ecosystem. Niche can be defined by variables like temperature and resources. Carrying capacity is the maximum population size an environment can sustain indefinitely.
This study examines the physicochemical controls on the transport of veterinary pharmaceuticals and hormones from animal manures to surface waters. The researchers investigated the long-term sorption kinetics of the antibiotic lincomycin on various biochars derived from animal manures. They also studied the sorption and transport of the hormone 17β-estradiol on biochars using batch experiments and fixed-bed column experiments. The results showed fast initial surface sorption and slower long-term pore diffusion of lincomycin onto the biochars. Additionally, biochar had a greater sorption capacity for 17β-estradiol than sand and reduced its transport compared to biochar-free sand in column experiments.
This document provides information on various types of ecosystems. It begins by defining an ecosystem as the organisms living in a given area and how they interact with abiotic factors. It then discusses energy flow through food chains and food webs. Major ecosystem types described include forests, grasslands, deserts, tundra, freshwater, and marine ecosystems. The document also covers biogeochemical cycles, succession, and renewable and non-renewable energy resources.
Methods of measuring biodiversity Biodiversity indexLekhan Lodhi
Scientists use several methods to measure biodiversity, including canopy fogging, quadrat sampling, transect sampling, and netting. The method used depends on the types of organisms being counted and the habitat. To protect biodiversity, scientists document species identities and locations in museum collections and computer databases. Analyzing species distributions has identified "biodiversity hotspots" with exceptionally high diversity in small areas.
Biodiversity = Science, Technology and Society Group-2jammellcerezo
Biodiversity refers to the variety of life on Earth, including diversity within and between species and ecosystems. It provides many benefits like food, clean water, climate regulation, and cultural services. There are three main types of biodiversity: genetic diversity within species, species diversity between species, and ecosystem diversity between ecosystems. Biodiversity is threatened by habitat loss, pollution, climate change, and other human activities. Protected areas aim to conserve biodiversity by limiting human impacts and regulating activities like hunting, grazing, and forestry within areas like national parks, wildlife sanctuaries, and forest reserves.
3 ijfaf jul-2017-1-evaluation of the ichthyofaunalAI Publications
Fish constitute more than half of the total number of all the aquatic vertebrates in the world; thus, a study was carried out for six months from January-June, 2016 to investigate the physico-chemical parameters, composition, abundance and diversity of ichthyofauna present in some sections of Omambala, Ezu and Ahommiri Rivers in Anambra state, Nigeria. Water samples were collected for physico-chemical analysis and fish samples were also collected with the assistance of artisanal fishermen using different types of traditional fishing gears namely - gill nets, cast nets, hook and line, local traps (baited) and bag nets to evaluate fish species composition and abundance. The result of the physico-chemical analysis showed uniform values for temperature (25±0.16oC-30±0.48oC), dissolved oxygen (3.65±0.78-5.65±0.11mg/l) and biochemical oxygen demand (13±0.03-16±0.08mg/l) which favoured the distribution of fishes present in different sections of the three Rivers. A total catch of 11,031 fishes were recorded from the three Rivers which comprised 11 orders, 29 families, 43 genera and 69 species. Umuoba-Anam section had 9691 catches, Ebenebe section (702) and Awa section (638). Monthly composition showed highest in March (1,909) and June (2,294) for dry and rainy seasons respectively. Seasonal composition showed highest during the rainy season with a total number of 5922 fishes while 5109 fishes was recorded for the dry season. The diversity indices of the three Rivers indicated diverse communities with ten common species variety and Shannon Weiner (H’) diversity index of 2.755-3.682. Tilapia zilli (22.2%) was the most common and abundant species followed by Clarias anguillaris (21.4%), Malapterus electricus (18.9%), Heterobranchus bidorsalis (15.4%), Xenomystis nigri (14.6%), Heterotis niloticus (13.0%), Auchenoglanis monkei (11.0%), Tilapia dageti (10.2%), Hepsetus odoe (8.1%) and Bagrus filamentosus (7.2%). The study revealed that taxa richness and species diversity increase with increased water level and uniform physico-chemical changes. Further survey of fish species diversity and abundance should be carried out continuously for a longer period on a larger scale for a thorough assessment of the water bodies and their fishery potentials.
Aspects of the Geomorphology and Limnology of some molluscinhabited freshwate...iosrjce
This document summarizes a study of the geomorphology and limnology of 25 freshwater bodies in northern Nigeria that are inhabited by molluscs. A total of 14 mollusc species from 9 families were found across the water bodies. Measurements of the water bodies showed variations in elevation, size, substrate, and vegetation. Water quality parameters like temperature, pH, dissolved oxygen, alkalinity, and hardness also varied significantly between sites. Linear regression analysis revealed relationships between elevation and other factors. Canonical correspondence analysis established relationships between mollusc distributions and environmental characteristics. The study provides information on the habitats and water quality conditions of mollusc-inhabited freshwaters in northern Nigeria.
Effect of water parameters on temporal distribution and abundance of zooplank...AbdullaAlAsif1
Seasonal abundance of zooplankton in relation to different physico-chemical conditions of Kaptai lake has been studied. A total of four major groups of zooplankton were identified from study area of Kaptai lake during three seasons observation at pre-monsoon, monsoon and Post-monsoon. These four groups were categorized into rotifers, copepods, cladocerans and others (fish larvae, shrimp larvae, insects, mosquito larvae etc.). The mean abundance of group rotifers, copepods, cladoceras and others were 103, 84.67, 38.33 and 41.83 ind. L-1 respectively. The highest group was rotifers in terms of abundance and composition where compositions were recorded 38 % at three season's observation. The lowest group was cladoceras in term of abundance and composition where compositions were recorded 14 %. The air temperature, water temperature, transparency, water pH, DO, BOD5, PO 4-P, NO 2-N, SiO 3-Si, TSS, TDS, Alkalinity ranged between 21 and 27.5C, 23.5 and 31.5C, 0.8 and 3 m, 7.1 and 7.5, 5.72 and 8.58 mg/l, 8.55 and 12.87 mg/l, 3.22 and 4.13 µg/l, 0.992 and 1.19 µg/l, 161.18 and 201.15 µg/l, 0.28 and 0.48 g/l, 0.18 and 0.68 g/l, 40 and 60 ppm, respectively. Margalef richness index (d), Pielou's evenness index (J'), Shannon-Wiener diversity index (H'), Simpson dominance index (λ) are analyzed by Primer V6 software to quantify the collected species. Through same software SIMPER, Cluster analysis also done to compare similarity between season.
Biodiversity and abundance of fish and plankton of nguru lake, northeastern, ...Alexander Decker
This document summarizes a study on the biodiversity and abundance of fish and plankton in Nguru Lake, Nigeria. Twenty-five species of phytoplankton from four divisions were found in the lake. Sixteen species of zooplankton from four groups were present. Twenty-four fish species belonging to thirteen families were identified. The family Cichlidae dominated the fish population. Shannon-Weiner indices indicated some stations had higher diversity and were less polluted than others. The study provides baseline data on the lake's biodiversity to support development of its fisheries potential.
Assessment of nutritive values of some waterweedsAlexander Decker
This document summarizes a study that evaluated the nutritive values and phytochemical constituents of 10 common waterweeds in Nigeria. The study found that the waterweeds contained 13.67-32.67% crude protein, 4-26% crude fiber, and 7.33-26% ash. The waterweeds also had adequate levels of other nutrients. Though high in moisture, the waterweeds could provide a source of nutrients, especially protein, for livestock during dry seasons. Qualitative analysis found that most waterweeds contained steroids, while four contained saponins and some contained phenols or tannins. Nymphaea lotus was found to have the lowest levels of anti-
Food and feeding habits of the brackish river prawn (macrobrachium macrobrach...Alexander Decker
This document summarizes a study on the food and feeding habits of the brackish river prawn (Macrobrachium macrobrachion) in the Great Kwa River estuary in Nigeria. Stomach contents from 200 prawns collected over six months were analyzed. A variety of food items were found, including detritus, diatoms, algae, mud, sand, fish bones, insect parts, and more. Detritus was the most common food item based on frequency of occurrence. Insect parts were the most abundant food item based on numerical analysis. The study concludes that M. macrobrachion is an omnivorous detritivore that feeds opportunistically on available food
Trophic state indices and Phytoplankton quotients for the Kisumu Bay, Lake Vi...Douglas Anyona
This study aimed to estimate phytoplankton quotients and trophic state indices for Kisumu Bay in Lake Victoria to determine the bay's eutrophic level. Water and phytoplankton samples were collected from 5 stations in the bay from 2009-2010. Cyanophyceae was the most dominant phytoplankton group at 57%. The mean phytoplankton quotient was estimated to be 4.1, indicating a high eutrophic state. Nutrient levels were also high, with total phosphorus at 289.6 μg/L and total nitrogen at 1518.5 μg/L. The elevated eutrophic state was attributed to high nutrient loads from anthropogenic activities, industrial and
Diversity and abundance of Macrobenthos in a subtropical estuary, BangladeshAbdullaAlAsif1
Soft bottom macrobenthos are important component of the marine and coastal trophic chain. There has been sparse information regarding the distribution of soft bottom macrobenthos form the coastal water of Bangladesh. Consequently, the present study was an effort to reveal the diversity and abundance of macrobenthos in the Feni Estuary in a seasonal pattern together with the hydrological factors. A total of 17 taxa families of soft-bottom invertebrates were found over the two sampling seasons. The current study yielded a total number of 34,726 ind./m 2 (mean 2480ind./m 2) including 18,909ind./m 2 in wet season (mean 2682ind./m 2) and 15,817 ind./m 2 in dry season (2259ind./m 2). The highest density of soft-bottom invertebrates was in the wet season while the lowest number in the dry season. A total of 5 groups of macrobenthos were found over the two sampling seasons. The dominant group was Polychaeta that contributed 43.60% of the total soft-bottom invertebrates. The values of biodiversity indices were higher in dry season compare to the wet season in most of the sampling station during the study period.
Impacts of agricultural wastes on groundwater pollution in lipakala farms, on...Alexander Decker
This document summarizes a study on the impacts of agricultural wastes on groundwater pollution at Lipakala Farms in Nigeria. Water samples from the main water well supplying the farm were tested. Results showed elevated levels of ions like lead and nitrates. Physical characteristics like temperature and turbidity were within acceptable limits, but taste indicated high salt deposits. Microbial analysis found bacterial and coliform contamination, indicating pollution from waste. The well is located downstream from a waste dump and farmland, making it susceptible to runoff. Improved waste disposal and public education are recommended to prevent further groundwater contamination.
ABSTRACT- Fresh water resources are not unlimited. The high rate of increase of human population of Nepal and the
rapid rate of industrialization have created problems of disposal of waste water products. The domestic wastes, excretory
materials of both human and animals and industrial effluents are discharged into the nearly lakes, rivers, reservoirs and
tanks and even in the catchment area of the above water bodies. The undesirable substances are regularly mixed into the
water of pond through surface run-off that degrades the water quality. Since last several years, there have been added an
array of agricultural pesticides and insecticides, which are further seriously aggravating the problem of pollution both for
public health and aquaculture. The detailed information of water quality and status of affected living organisms of water
bodies are necessary for the implementation of any management plan. The present investigation encompasses on plankton
identifying the ecological quality of Chhapakaiya pond Birgunj, Nepal. Seasonal sampling from all the sampling sites (site
A, B, C, D) in winter, summer and rainy season for period of 12 months (November 2014 – October 2015) at 9:00-11: 00
AM. A total of 27 taxa from different classes of zooplankton were reported. The zooplanktons were reported to be
maximum (774.4 unit/L) during summer and minimum (539.2 unit/L) during the rainy season in Chhapakaiya pond.
Key-words- Zooplankton, Biological productivity, Habitat degradation
Environmental conditions and zooplankton community structure in five ponds in...Innspub Net
The degradation of surface water quality in Cameroon is linked to the absence of a functional waste management strategy. For such a strategy to be efficient, a general understanding of aquatic ecosystems will be of importance, these management strategies are particularly lacking in the eastern part of the country. To better understand and appreciate the ecosystems in the town of Bertoua, five ponds where chosen for the physicochemical and zooplankton communities analysis. Sampling on these ponds was conducted from March 2016 to April 2017 on a monthly basis. Samples for physicochemical analysis were collected at 20cm below water surface at the middle of each pond and measured were done following the recommendations of Rodier and Alpha. Biological samples were collected by filtering 50 liters of water through a 64µm mesh opening sieve. Identification was done using standard methods and identification keys. One-way ANOVA analysis was conducted to assess the potential differences between the different ponds base monthly observations. Although they are all hypereutrophic, with regard to the values of the physicochemical parameters, the five ponds showed no significant difference between them but, the structure of the zooplankton community remains very diverse. 118 zooplankton species have been identified in the five ponds. The distribution of zooplankton in these hydrosystems was mainly governed by the presence of organic matter. This study sheds light on the status and biological diversity of ponds in eastern Cameroon, data on which to rely to develop management strategies.
This document summarizes a study that assessed pollutant levels in Lake Tadie in Mampong Ashanti, Ghana. Water samples were collected from 5 points around the lake and analyzed for physicochemical and biological parameters in a laboratory. The results found that temperature, total dissolved solids, and levels of sulfate, nitrate and phosphate were within recommended limits. However, pH levels and concentrations of iron, lead and fecal coliform bacteria exceeded guidelines. The acidic pH is likely due to runoff of fertilizers and waste from surrounding agricultural and residential areas entering the lake. Overall, the lake water quality has been impacted by human activities in the area.
Stomach histological decay of milkfish, chanos chanos (forsskal, 1775)Alexander Decker
This document summarizes a study on the histological decay of the stomach in milkfish (Chanos chanos) reared in a traditional brackishwater pond in East Java, Indonesia. Several factors were found to contribute to deterioration of the stomach, including environmental stress from heavy metals in the water, high ammonia levels, a shift in the natural food composition to cyanobacteria, and infection by the Myxobolus parasite. Earlier harvest, higher mortality, and smaller fish size compared to normal indicated declining productivity of traditional milkfish aquaculture in the region in recent decades.
The document summarizes a study that monitored water quality and benthic ecosystems around fish farms in Igoumenitsa Bay, Greece between 2011-2012. Water samples found increased nutrients like phosphorus near the fish farms, especially in summer, indicating localized eutrophication. A dispersion model showed waste from the farms could spread over 120 meters, mostly towards the coast. The benthic ecosystem was not significantly disturbed, though a biotic index found potential ecological risk in summer. Increased feeding and fish metabolism in summer, combined with seasonal currents, contributed to the localized nutrient increase near the farms.
2009 assessment effects of cage culture on nitrogenearambulm3
This document summarizes a study that investigated nitrogen and phosphorus dynamics in relation to fallowing periods for a fish cage farm located in a shallow lake in China. The study analyzed total nitrogen and total phosphorus levels in lake water and sediment during two fish rearing cycles from 2000-2001. Key findings include:
1) Nutrient levels increased more during the first rearing cycle than the second.
2) Impacts were greatest near the cages (underneath and at cage sides), with higher sedimentation of nitrogen and phosphorus observed at cage sides.
3) After 3 months of fallowing, water nutrient levels decreased significantly but sediment nutrient levels remained high, indicating recovery occurs during fallowing
Specific physicochemical parameters influence on the plankton structure in ag...Innspub Net
The continuous discharge of effluents into Warri River, impacts on its water quality parameters as well as plankton species which requires commensurate surveillance. This study focuses on its physicochemical characteristics and their influence on plankton composition and abundance. The surface water samples and plankton collected monthly from June to November 2014 were analyzed using standard methods. The physicochemical parameters showed variations among the stations. The ANOVA results revealed that water temperature, transparency, turbidity, TDS, conductivity, pH, acidity, Dissolved Oxygen and phosphate were significantly different (P <0.05) among the studied sites. A total of 849 plankton species identified; 814 species were phytoplankton consisting of four groups (Bacillariophyta> Chlorophyta> Euglenophyta> Cyanophyta, arranged in order of dominance. While zooplankton had 35 species grouped into 5 groups; Rotifera> Copepoda> Protozoa> Cladocera> Arachnida, in order of dominance. Pearson correlation revealed a significant correlation between different Plankton species population and some parameters (p<0.05). The principal component analysis labelled acidity, organic load, mineralization, nutrient, and organic pollution as influential factors governing plankton abundance in the studied area. These factors identify with materials from industries and human activities along the river, which results in the alteration of plankton composition, particularly Melosira granulata (Ehrenberg) Ralfs,1861. Inferred biological indicator of the water body. Diversity indices ranged from 0.28 to 1.39; Station 2 had the highest (1.39) and Station 1 the lowest species richness, a highly polluted river.
The document summarizes a field trip conducted by oceanography students to Nijhum Dwip island. The objectives of the trip were to learn field study techniques, collect samples of plants, soil, water and plankton, and assess water quality parameters and the socioeconomic conditions of local communities. During the trip, students assessed intertidal plant communities, collected phytoplankton and zooplankton samples, measured water quality, and learned sampling methods. The island was described as having diverse and productive ecosystems important for fisheries and declared as a national park and marine protected area.
This document summarizes a study that investigated the bioaccumulation and distribution of organochlorine pesticide residues in the food web of Lagos Lagoon, Nigeria. Samples of water, sediment, plankton, benthic invertebrates, and fish were collected from four locations in the lagoon and analyzed for 18 organochlorine pesticides using gas chromatography. The highest concentrations of pesticides were found in sediment samples, with total concentrations up to 2,953.84 μg/kg. Pesticide concentrations increased higher up the food web, with the highest levels found in predatory fish species. The results indicate bioaccumulation and biomagnification of pesticides in the Lagos Lago
Plankton diversity and aquatic ecology of a freshwater lake (L3) at Bharti Is...GJESM Publication
The Larsemann Hills range is an ice-free oasis on the Ingrid Christensen Coast of Princess Elizabeth
Land, East Antarctica, which includes Bharti Island, Fisher Island, McLeod Island, Broknes Peninsula, Stornes
Peninsula, and several other islands, promontories, and nunataks. The Larsemann Hills is an ice-free area of
approximately 50 km2, located halfway between the Vestfold Hills and the Amery Ice Shelf on the south-eastern
coast of Prydz Bay, Princess Elizabeth Land, East Antarctica. The ice-free area consists of two major peninsulas (Stornes and Broknes), four minor peninsulas, and approximately 130 near shore islands. The Larsemann Hills area contains more than 150 lakes at different Islands and peninsulas. Bharti Island of Larsemann Hills in east Antarctica was selected as a sampling site for the present study. Water sample was collected from a freshwater lake during XXXth Indian Scientific Expedition to Antarctica (ISEA) and analyzed for the physico-chemical parameters, major elements, trace metals and major plankton diversity in surface lake water by following standard methodology. The concentrations of metals Cu, Pb, Cd, Zn and Cr were measured using Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Phytoplankton and zooplankton were also assessed in the aquatic ecosystem of Lake L3 at Bharti Island, Larsemann Hills over east Antarctica. Psychrophillic bacteria were found 71 cfu in lake water, while total bacterial count was found to be 5.4 × 102cfu.
Similar to Ecological survey of macrobenthic invertebrates of selected ponds in agbede flood plain, southern nigeria (20)
Abnormalities of hormones and inflammatory cytokines in women affected with p...Alexander Decker
Women with polycystic ovary syndrome (PCOS) have elevated levels of hormones like luteinizing hormone and testosterone, as well as higher levels of insulin and insulin resistance compared to healthy women. They also have increased levels of inflammatory markers like C-reactive protein, interleukin-6, and leptin. This study found these abnormalities in the hormones and inflammatory cytokines of women with PCOS ages 23-40, indicating that hormone imbalances associated with insulin resistance and elevated inflammatory markers may worsen infertility in women with PCOS.
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Ecological survey of macrobenthic invertebrates of selected ponds in agbede flood plain, southern nigeria
1. Journal of Biology, Agriculture and Healthcare www.iiste.org
ISSN 2224-3208 (Paper) ISSN 2225-093X (Online)
Vol.3, No.10, 2013
23
Ecological Survey of Macrobenthic Invertebrates of Selected
Ponds in Agbede Flood Plain, Southern Nigeria
* John Ovie Olomukoro, Idiaghe Martins Osamuyiamen And Abdul-Rahman Dirisu
Department Of Animal And Environmental Biology,
Faculty Of Life Sciences, University Of Benin, Benin City, P.M.B. 1154, Nigeria.
*CORRESPONDING AUTHOR: E-mail: olomsjo@yahoo.com
Abstract
Ecological study on three selected ponds of Agbede flood plain was fortnightly carried out between January and
June, 2007 to assess and document the macrobenthic fauna composition, abundance and distribution, as well as
the physicochemical status of some parameters in water which were collected and analyzed monthly. Benthos
was sampled for using the Ekman Grab operated by hand in shallow waters together with the Kick sampling
method. Among the eight physicochemical characteristics investigated, pH fluctuated from slightly acidic to
slightly alkaline with range of values (5.90 – 7.35) at the studied stations. Significant difference (P<0.05) was
observed for biological oxygen demand (BOD5) and dissolved oxygen (DO). A total of ten (10) groups
comprising macroinvertebrates taxa with one thousand and thirty one (1,031) individuals were recorded in this
study. Most dominant groups were represented by Coleopterans (35.79% and 374 individuals), Hemiptera (20.19%
and 211 individuals) and Dipterans (18.47% and 193 individuals). Evenness was highest in pond 1 (0.4973).
The highest number of macroinvertebrates were collected from pond 2 (416) where no human activities occurred
and however implied that human activities can rapidly alter any previously stable communities of aquatic
environments.
Keywords: Ecology, Flood plain, Macrobenthos, Ponds, Fadama, Nigeria
1.0 Introduction
Benthic macroinvertebrates are an important part of the food chain, especially for larger aquatic animals.
They feed on algae and bacteria which occupy the bottom of the food chain. Some shred, eat leaves and others
on organic matters that enter the waters. Studies on the benthos of lentic water bodies have not been given much
attention for a long time and they are one of our primary sources of animal proteins such as fishery products.
With the advent of Fadama Agriculture initiated by the Federal Government of Nigeria, colonization of natural
and artificial ponds has become a phenomenon.
Only recently, ponds in Agbede wetlands are being utilized for aquacultural practice which is one of the
Fadama projects. A large number of studies on benthic invertebrates and other related topics have been carried
out (Ogbeibu and Egborge, 1995; Imoobe and Ohiozebau, 2009; and Olomukoro and Dirisu, 2012). Although
studies on macroinvertebrates communities in ponds have not been given much attention in Nigeria and Africa in
general. Ogbeibu and Egborge, (1995) recorded a total of 214 invertebrates taxa in the Okomu reserve (ie. 5
ponds and 2 streams), comprising 80 Zooplankton and 134 macrobenthic invertebrates, with pond 5 having the
highest number of invertebrates. Evagelopoulos et al., (2005) studied the spatial variations of both phytoplankton
and macrobenthic invertebrates descriptors (composition, abundance and biomass) at 6 sampling sites in the low
salinity ponds of Kalloni Saltworks, Hellas (2004) studied the macrobenthic invertebrates which comprised a
total of 54 taxa belonging to 5 groups which are; Molluscans, Polychaeta, Crustacean, insect and Nemertea.
Most of the taxa identified in the study area belong to Crustacean (13 species), followed by polycheata (16
species) and Mollusca (23 species).
Ecological studies on protected areas have focused mainly on the more visible faunal components
while, the less conspicuous but ecologically important aquatic invertebrates have always been ignored. The
urgent need for a complete inventory of fauna resources in these ponds engendered the present study. This work
is the first of a series in Agbede Wetlands areas and it provides baseline information on the species composition,
abundance and distribution of the macrobenthic invertebrates and the physicochemical status of some parameters.
2.0 Study Area
This study was carried out in three selected ponds of Ogwe-Edion flood plain at Agbede (latitude
7.33o
N and longitude 2.98o
E), between the months of January and June, 2007. The wetlands are about 5km from
the main town of Agbede, (see fig. 1). Agbede is a town located in the Northern part of Edo State, within an
attitude of 122m above sea level.
2. Journal of Biology, Agriculture and Healthcare www.iiste.org
ISSN 2224-3208 (Paper) ISSN 2225-093X (Online)
Vol.3, No.10, 2013
24
The study area has the tropical wet and dry climate regulated primarily by rainfall. The wet season stretches for a
period of seven (7) months usually from April to October. Months of heavy rainfall are July (462mm) and
August (359mm). The dry season is for a period of five (5) months with rainfall which ranges from 99.8 to
22.3mm. The driest months are December to February. The temperatures during this dry period were high. The
mean annual temperature ranged from 25 to 33o
C.
The study area is primarily that of a derived Savannah. Ponds are situated between grasses and some
few trees. Along the banks of the ponds are shrubs and grasses. The ponds serve as sources of water for grazing
animals (Nomadic Agriculture) and also for irrigation purposes. Human activities in the ponds are fishing,
washing, agriculture and herds.
3.0 Sampling Stations
Sampling was carried out fortnightly from January to June, 2007. Sampling for physical and chemical
parameters and benthos was done in the three (3) ponds.
Pond 1 was located close to a farm and about 700m from Pond 2 completely shaded by dense trees canopy.
Bottom sediment was clayey with varying amounts of organic matter especially dead and decaying leaves that
falls from the trees. Pond 1 witnessed the most anthropogenic effects mainly in the form of using Lindane
(Pesticide) (Gammalin-20) for harvesting fish. It has an average depth of 82.50cm with a dimension of 350m x
25m.
Pond 2 was next to pond 1. It was smaller than pond 1 in size and depth. The bottom was clayey, with trees such
as (Bambusa sp) surrounding the pond. The bottom was rich in allochtonous materials. No human activity was
observed during the period of sampling except, vegetable farms. Pond 2 has an average depth of 66.17cm with a
probable dimension 30m x 20m.
Pond 3 was about 950m from Edion River in Agbede. Substratum consists of clay. The pond was exposed
directly to rays from the sun and as a result both the ambient and water temperatures were higher than that of
ponds 1 and 2. Main activity observed here was that of cattle herds. Pond 3 was treeless but overgrown with
rooted, floating and submerged aquatic macrophytes (Comelina sp. and Ceratophylum submersum).
4.0 Materials and Methods
4.1 Physicochemical Characteristics
Water and benthic fauna samples were collected fortnightly from each of the three ponds understudied
for 6 months, January to June, 2007; between 0800hrs to 1100hrs Nigeria time. The physical parameters such as
air temperature, water temperature, pH and Conductivity were determined insitu. Temperatures were measured
using the 0 - 1000
C mercury in glass thermometer (Kurison model – 59). pH and Conductivity were determined
each using the pH-Conductivity metre, EC-500 (Extech instrument). Dissolved Oxygen (DO), Biological
Oxygen Demand (BODs), Phosphate and Nitrate were determined using the standards by APHA, (1998) and
thereafter transferred to the laboratory for analysis.
4.2 Benthic Fauna
Benthic fauna samples were collected using the methods earlier used by Hynes, (1971) and Olomukoro,
(1996), an Ekman Grab operated by hand in shallow waters was forced into the sediment within a radius of Im2
to a depth of about 20cm. The content trapped by the grab was processed by using the techniques earlier
described by Hynes (1971) and Olomukoro, (1996). The kick sampling method was used to sample macrophytes
for benthos as earlier described by Olomukoro, (1996). Sieved and sorted organisms were preserved in 70%
buffered alcohol, identification of the organisms were carried out using the appropriate keys of Olomukoro,
(1996).
4.3 Data Analysis
Data obtained were subjected to statistical analysis. Physicochemical characteristics were analysed with
SPSS – 16 for one-way analysis of variance (ANOVA). Biological indices such as taxa richness and evenness (E)
were computed using paleontological statistics soft ware tool pack (PAST). Both the physicohemical
characteristics and benthic fauna were subjected to correlation coefficient analysis.
5.0 Results
5.1 Physicochemical Characteristics
Summary of the physical and chemical characteristics are shown in table 1. All the parameters analysed had their
values within federal Ministry of Environment (FMNEV) limit. pH fluctuated from slightly acidic to slightly
alkaline with range of values (5.90 – 7.35) at the studied stations. Significant difference (P<0.05) was only
observed in biological oxygen demand (BOD5) and dissolved oxygen (DO).
3. Journal of Biology, Agriculture and Healthcare www.iiste.org
ISSN 2224-3208 (Paper) ISSN 2225-093X (Online)
Vol.3, No.10, 2013
25
5.2 Benthic fauna Structure
A total of ten (10) groups comprising 42 macroinvertebrates taxa and 1,031 individuals were collected
from the period of study. These groups include Ologochaeta (4 species), Decapoda (2 species), Ephemeroptera
(3 species), Odonata (9 species), Hemiptera (7 species) and Coleopterans (4 species). Others are 1 species of
Trichoptera, 10 species of Dipterans, 1 species of Aranaea and 1 species of Mesogastopoda (table 2).
The most dominant group was represented by Coleopteran which constituted 35.79% and 374
individuals of the entire population. Next to this was Hemiptera 20.19% with 211individuals and closely
followed by Dipterans 18.47% with 193 individuals. Ephemeroptera constituted 12.44% by composition and 130
individuals; others had rare values (table 3).
5.3 Biodiversity
Species evenness (E) was highest in station 1(0.4973) and lowest in station 2 (0.2644). Taxa richness (D) was
highest in station 3 and lowest in station 1, and general diversity (D) in Pond 3 had the highest diversity while
pond 2 had the lowest diversity (table 4).
6.0 Discussion
The study area under consideration is part of Agbede Wetlands in a derived Savannah zone owned by
some indigenes and Edo State Government for Agricultural extension services for the cultivation of rice. Two
months after the commencement of the sampling exercise, one of the ponds (Pond 1) was treated with Lindane
(Gammalin-20) which caused the disruption of the diversity of the macroinvertebrates community. Pond 1, when
compared to other ponds, had the lowest species richness in March when the Gammalin treatment was effected
and abundance of macrobenthic invertebrates was affected. These low taxa, however, may be attributed to the
Lindane treatment which impaired the diversity of the fauna and subsequent elimination of the most sensitive
group in this pond. The number of taxa however, was higher than what was recorded in a tropical stream treated
with pesticide (Victor and Ogbeibu, 1986), but much lower than that of other tropical streams (Bishop, 1973)
and temperate water bodies (Lenat et al., 1981; Evagelopoulos et al., 2005) affected by inert pollutants.
Macroinvertebrates groups adversely affected by the disruption in Pond 1 were Ephemeroptera and
Hemiptera. Their density of occurrence in other undisrupted ponds was relatively high as in the case of
coleopteran and dipteran larval. The relative abundance of these later groups in the chemically treated pond was
high compared to other groups which indicate that they were more tolerant to Gammalin-20. However,
Coleopterans among other invertebrate groups have been reported to be adversely affected in a DDT
methocychlor and Gammalin-20 treated aquatic systems (Victor and Ogbeibu, 1986, Fredeen, 1975). Among the
dipteran larvae, the family chironomidae were relatively abundant in the study ponds. Chironomous travalensis
were recorded only in Ponds 1 and 3 in fairly high abundance. However, dipteran larva was the most common
taxonomic group and had the highest proportion of wide spread species. Wallace and Hynes (1981) observed that
burrowing species which may inhabit less exposed substrate are likely to escape the immediate deleterious
effects of pesticide treatment. This view seems to support the relative abundance of chironomous sp after
Lindane (Gammalin-20) treatment in Pond 1.
The crustaceans were represented by one family only, Desmocaridae which consist of D. trispinosa and
D. bislineata were absent in Pond 3. D. trispinosa has been previously recorded in most Nigerian waters
(Ogbeibu and Egborge 1991, 1995; and Olomukoro and Egborge, 2003).
Ephemeroptera and Odonata which are the sub-dominant groups were well represented in the various
ponds. Ephemeroptera were present in all the three ponds. Baetis sp was the dominant species. Baetids are
cosmopolitan in distribution and are restricted to clean fresh water environment and it is therefore not surprising
to have them in low abundance in disrupted ponds. Although Baetis sp has been recorded in perturbed stretches
of tropical rivers (Victor and Dickson, 1985; and Olomukoro and Egborge, 2003). The Odonata nymph were not
evenly distributed in the ponds rather they were highly concentrated in pond 3 with the exception Coengrion sp
and Libellula sp that were present in all the ponds. These two species are more cosmopolitan in distribution than
any other member of the group.
Oligochaetes were more restricted in their distribution (i.e. had smaller range sizes) than the other
dominant groups, and this could likely be the result of natural factors. Trichoptera, Arachnida and Molluscan had
relatively low abundance. Trichoptera and Arachnida were both represented with one species each;
Polycentropus sp and Argynoneta aquatica as well as one species of Mollusca, Hydrobia sp. The disturbance of
the substratum of pond 1 after treatment with Gammalin-20 would have probably enhanced the disappearance of
these taxa thereby accounting for their low abundance. Species diversity as a measure of species richness in the
study area was highest in pond 1 inspite of the disruption by Gammalin treatment. Monthly variation in taxa
richness indicated that pond 3 had higher richness than the other ponds. The monthly variation in evenness
indices indicated that pond 1 has the highest taxa evenness with pond 2 having the lowest.
4. Journal of Biology, Agriculture and Healthcare www.iiste.org
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From the study, the highest number of macrobenthic invertebrates was collected from pond 2 where no
human activities were observed. It however showed human activities can rapidly alter the eco-balance of any
previously stabled communities of aquatic systems as seen in pond 1.
Acknowledgement
We gratefully acknowledge Mallam Sadiq Yusuf of Agbede Community and Mr. Festus Arijode of the
Department of Animal and Environmental Biology, University of Benin, Benin City, whom always accompanied
us to the field and assisted during the Samplings.
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.
Table 1:Summary of the Physical and Chemical Characteristics of the Selected Ogwe-Edion Ponds in
Agbede Wetlands.
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Table 3: Relative Percentage Composition of Taxonomic Groups Including the Dominant and Sub-
Dominant Groups in the Study Sites
Table 4: Diversity Indices of the Macrobenthos of Selected Ogwe-Edion Ponds in Agbede wetlands
Pond 1 Pond 2 Pond 3
Taxa_S 22 21 32
Individuals 213 416 402
Dominance_D 0.1416 0.3306 0.1788
Shannon_H 2.392 1.714 2.436
Simpson_1-D 0.8584 0.6694 0.8212
Evenness_e 0.4973 0.2644 0.3569
Margalef 3.917 3.316 5.17
Equitability_J 0.774 0.5631 0.7028
TAXA NUMBER OF INDIVIDUALS % OCCURRENCE
Oligochaeta 45 4.31
Decapoda 13 1.24
Ephemeroptera 130 12.44
Odonata 59 5.65
Hemiptera 211 20.19
Coleoptera 374 35.79
Trichoptera 01 0.09
Diptera 193 18.47
Aranaea 03 0.29
Mesogastropoda 14 1.33
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