This document summarizes a study on the diversity, extinction risk, and conservation of fish species in Malaysia. It finds that:
- A total of 1951 fish species from 704 genera and 186 families are recorded in Malaysia, occupying a variety of freshwater and marine habitats.
- Nearly half (48%) of Malaysian fish species are currently threatened, while 27% require urgent evaluation of their conservation status. Freshwater habitats have the highest percentage of threatened fish species (87%).
- The main threats to fish species are habitat loss or modification (76%), overfishing (27%), and bycatch (23%). Freshwater fish are most threatened by habitat changes and overfishing, while marine fish face additional threats
This paper examines fish species that have disappeared from catches around Bohol Island, Philippines over the period 1950-2007 based on interviews with local fishers. Generalized least squares tests showed steep declines to zero in catch for many species. Twenty of the 21 disappeared species were moderate to large bodied fish, including giant grouper and African pompano. Six were slow growing and four were late maturing. Species with large body size and high fishing pressure may be particularly vulnerable to overexploitation. Traditional ecological knowledge from fishers can provide long term catch data and inform conservation priorities when scientific data is limited.
A gray whale was sighted in the Mediterranean Sea in May 2010, which was highly unusual since gray whales were last recorded there in the 1700s. There are three potential explanations for the origin of this whale: 1) it was a vagrant from the larger eastern North Pacific population; 2) it was a vagrant from the smaller western North Pacific population; or 3) it was from a previously extinct North Atlantic population. After analyzing routes and comparing identification photos to existing catalogs, the eastern North Pacific population was deemed most likely. This record coincides with shrinking Arctic sea ice due to climate change, suggesting whales may begin recolonizing the North Atlantic as barriers to mixing between populations decrease.
Evaluating a marine protected area in a developing country; Mafia Island Mari...Marcus C
This study evaluated the effectiveness of the Mafia Island Marine Park in Tanzania at protecting fish populations compared to adjacent intensively fished areas. The densities, biomass, and sizes of the ecologically and economically important blackspot snapper fish were compared between the marine park and fished areas using underwater visual censuses and catch data. Results showed the target species was over four times more dense and its biomass was six to ten times higher inside the marine park. Individual fish sizes were also on average 37% larger in the park. Higher fish numbers and biomass correlated with greater hard coral cover and habitat complexity. This supports the role of marine protected areas in conserving habitats and fisheries.
Groundwater studies related to tropical islands in Malaysia are briefly reviewed. Perspectives are addressed as three aspects: (a) study location, where groundwater studies in Malaysia are conducted in different types of tropical islands (b) methods, namely numerical modeling, geophysical investigations, hydrochemical analysis and geochemical modeling were applied in the studies of groundwater where numerical modeling is the most used method in groundwater studies of Malaysian coastal environment and tropical islands; (c) types of studies, where most of groundwater studies are more focused in investigating the groundwater resources and management as well as seawater intrusion using numerical models and geophysical investigations. This review revealed that main objectives in most of Malaysian groundwater studies in tropical islands are
The three national wildlife refuges in the Lower Florida Keys are the National Key Deer Refuge, Great White Heron National Wildlife Refuge, and Key West National Wildlife Refuge. These refuges, totaling over 6,600 acres, extend from East Bahia Honda Key west to the Marquesas Keys. They provide habitat for endangered species like the Key deer and protect wildlife from human disturbance. Management utilizes tools like remote sensing, law enforcement, and zone restrictions to monitor the environment and resources, enforce regulations, and restrict public access in sensitive areas to protect nesting and feeding birds.
This document summarizes a study that mapped coastal habitats along the Mazandaran coast of the Caspian Sea in Iran using the Coastal and Marine Ecological Classification Standard (CMECS). The study area extended from Babolsar to Amir Abad's Behshahr port. Field surveys were conducted in summer and winter 2011 to identify and classify biotic cover. Nine biotopes within two main habitat types (sandy shore and sandy-rocky shore) were identified and mapped. The biotopes fell within three classes of biotic cover: faunal bed, emergent wetland, and aquatic bed. The study found the habitats were heterogeneously distributed and more diverse in the western half of the
This report summarizes a 7-year study of the nearshore fish fauna in Bonne Bay, Newfoundland from 2002-2008. 31 fish species from 17 families were documented. Both juvenile and adult Atlantic cod were present, suggesting a local "bay cod" population. Acadian redfish and striped wolfish, a species protected under Canadian law, also inhabit the bay. Fish assemblages varied between different benthic habitats. The study provides a baseline for conservation efforts in the nationally protected bay, which supports diverse fish communities and species.
This document analyzes sea turtle strandings in Louisiana over an eight year period from 2002 to 2009. A total of 163 sea turtles from 5 different species were recorded as strandings, with concentrations primarily in the Lake Charles area and along Grande Isle and Grand Terre. Strandings peaked in late April through early June and again in early October through mid-November, overlapping with periods of recreational boating and open fisheries seasons for menhaden and shrimp. About 23% of turtles showed obvious strike marks. A chi-squared test found a statistically significant association between strandings and open fisheries seasons, though this does not imply fishing caused the observed morbidity and mortality.
This paper examines fish species that have disappeared from catches around Bohol Island, Philippines over the period 1950-2007 based on interviews with local fishers. Generalized least squares tests showed steep declines to zero in catch for many species. Twenty of the 21 disappeared species were moderate to large bodied fish, including giant grouper and African pompano. Six were slow growing and four were late maturing. Species with large body size and high fishing pressure may be particularly vulnerable to overexploitation. Traditional ecological knowledge from fishers can provide long term catch data and inform conservation priorities when scientific data is limited.
A gray whale was sighted in the Mediterranean Sea in May 2010, which was highly unusual since gray whales were last recorded there in the 1700s. There are three potential explanations for the origin of this whale: 1) it was a vagrant from the larger eastern North Pacific population; 2) it was a vagrant from the smaller western North Pacific population; or 3) it was from a previously extinct North Atlantic population. After analyzing routes and comparing identification photos to existing catalogs, the eastern North Pacific population was deemed most likely. This record coincides with shrinking Arctic sea ice due to climate change, suggesting whales may begin recolonizing the North Atlantic as barriers to mixing between populations decrease.
Evaluating a marine protected area in a developing country; Mafia Island Mari...Marcus C
This study evaluated the effectiveness of the Mafia Island Marine Park in Tanzania at protecting fish populations compared to adjacent intensively fished areas. The densities, biomass, and sizes of the ecologically and economically important blackspot snapper fish were compared between the marine park and fished areas using underwater visual censuses and catch data. Results showed the target species was over four times more dense and its biomass was six to ten times higher inside the marine park. Individual fish sizes were also on average 37% larger in the park. Higher fish numbers and biomass correlated with greater hard coral cover and habitat complexity. This supports the role of marine protected areas in conserving habitats and fisheries.
Groundwater studies related to tropical islands in Malaysia are briefly reviewed. Perspectives are addressed as three aspects: (a) study location, where groundwater studies in Malaysia are conducted in different types of tropical islands (b) methods, namely numerical modeling, geophysical investigations, hydrochemical analysis and geochemical modeling were applied in the studies of groundwater where numerical modeling is the most used method in groundwater studies of Malaysian coastal environment and tropical islands; (c) types of studies, where most of groundwater studies are more focused in investigating the groundwater resources and management as well as seawater intrusion using numerical models and geophysical investigations. This review revealed that main objectives in most of Malaysian groundwater studies in tropical islands are
The three national wildlife refuges in the Lower Florida Keys are the National Key Deer Refuge, Great White Heron National Wildlife Refuge, and Key West National Wildlife Refuge. These refuges, totaling over 6,600 acres, extend from East Bahia Honda Key west to the Marquesas Keys. They provide habitat for endangered species like the Key deer and protect wildlife from human disturbance. Management utilizes tools like remote sensing, law enforcement, and zone restrictions to monitor the environment and resources, enforce regulations, and restrict public access in sensitive areas to protect nesting and feeding birds.
This document summarizes a study that mapped coastal habitats along the Mazandaran coast of the Caspian Sea in Iran using the Coastal and Marine Ecological Classification Standard (CMECS). The study area extended from Babolsar to Amir Abad's Behshahr port. Field surveys were conducted in summer and winter 2011 to identify and classify biotic cover. Nine biotopes within two main habitat types (sandy shore and sandy-rocky shore) were identified and mapped. The biotopes fell within three classes of biotic cover: faunal bed, emergent wetland, and aquatic bed. The study found the habitats were heterogeneously distributed and more diverse in the western half of the
This report summarizes a 7-year study of the nearshore fish fauna in Bonne Bay, Newfoundland from 2002-2008. 31 fish species from 17 families were documented. Both juvenile and adult Atlantic cod were present, suggesting a local "bay cod" population. Acadian redfish and striped wolfish, a species protected under Canadian law, also inhabit the bay. Fish assemblages varied between different benthic habitats. The study provides a baseline for conservation efforts in the nationally protected bay, which supports diverse fish communities and species.
This document analyzes sea turtle strandings in Louisiana over an eight year period from 2002 to 2009. A total of 163 sea turtles from 5 different species were recorded as strandings, with concentrations primarily in the Lake Charles area and along Grande Isle and Grand Terre. Strandings peaked in late April through early June and again in early October through mid-November, overlapping with periods of recreational boating and open fisheries seasons for menhaden and shrimp. About 23% of turtles showed obvious strike marks. A chi-squared test found a statistically significant association between strandings and open fisheries seasons, though this does not imply fishing caused the observed morbidity and mortality.
This document provides an assessment of marine conservation and management in the Baja California region of Mexico. It summarizes the key biodiversity and ecosystems found in the region, including mangroves, kelp forests, and the pelagic ecosystem. The biodiversity of the region is threatened by overfishing, climate change, and poor resource management. The document evaluates oceanographic influences, the state of coastal and pelagic ecosystems, marine food production, ecosystem management challenges, and makes recommendations to improve conservation and management of the region's marine resources.
Aspects of life-history strategy of Marcusenius senegalensis (Pisces: Osteogl...AI Publications
Marcusenius senegalensis (Steindachner, 1870) is the dominant mormyrid in Niger River in Northern-Benin where this fish species constitutes an important component of artisanal fisheries. The current study documented the reproductive biology of M. senegalensis in order to contribute to management and sustainable exploitation. Monthly samplings were conducted between February 2015 and July 2016 using gillnets, cast net, and seine. Males dominated the population with a sex ratio of 1:0.96 in favor of males. Sizes at first sexual maturity were 167.89 mm-TL for males and 163.81 mm-TL for females. Monthly gonadosomatic index (GSI) averaged 0.12 ± 0.09 for males and 1.32 ± 1.56 for female and peaks recorded indicated that spawning occured from June to September. Fecundity were moderate to low (844 – 12,643 eggs) and significantly (p < 0.05) increased with total length and body weight. Thespecies showed egg diameters varying between 0.21 and to 1.77 mm and ovaries comprised oocytes at all stages of maturation indicating that M. senegalensis displayed a multi-spawning behavior. Marcuseniussenegalensis exhibited a demographic strategy between r and K, yet more inclined towards K-selected strategy. In Niger River, reproduction grounds were being severely degraded affecting recruitment and stocks. The current findings are valuable data to design a species management scheme that should includes spawning ground protection, species conservation and valorization and fisheries/aquaculture development.
Fish farming involves raising fish commercially in tanks or enclosures for food. It is the principal form of
aquaculture. Worldwide, the most important farmed fish species are carp, tilapia, salmon, and catfish. Satellites can
be used to monitor global fishing practices and check countries' reported data. GIS is a system used to store, analyze,
and manage geospatial data to support natural resource planning and management, including fisheries. In Bangladesh,
GIS is being used as a decision support system for fisheries and aquaculture management.
Mass bleaching of corals in 2010 seriously affected the corals in Andaman group of islands. Rise in Sea Surface Temperature (SST) was the primary reason due to less than normal rainfall during the bleaching period. Now three years after the bleaching episode the corals in South Andaman seems to recovering. The primary indicator of recovery being the new recruitment of corals especially Acropora spp. (branching corals) throughout the reef areas along with the increase in overall live coral cover. Multiple surveys were conducted in three stations viz. North Bay, Chidiyatapu and Marina Park along the eastern coast of South Andaman during this study and all the sites were found to have new recruitment of Acropora spp. which were severely affected during 2010 mass bleaching.
Koaro are a species of freshwater fish found throughout New Zealand. They undergo an amphidromous life cycle where larvae hatch in freshwater and migrate to the ocean before returning to freshwater as juveniles. As adults, koaro can reach up to 280mm in length and live over 15 years. They have morphological adaptations like ventrally flared fins that allow them to climb waterfalls up to 30m high. While koaro have a wide distribution and large population, some populations have declined due to threats like trout predation and habitat loss. Their conservation status is listed as "at risk - declining".
Re-Colonizing Soft Corals on the Degraded Coral Reefs of Gulf Of Kachchh Mari...paperpublications3
Abstract: Coral reefs of the Gulf of Kachchh are in a highly degraded condition, when compared with other three major coral reef regions of India. In correlation with geographical and oceanographical changes, its arid climate and the semi-diurnal tidal amplitudes fluctuations hamper the recovery of the reef. Soft corals may play the alternative key role in maintaining the ecological role in the degraded reef ecosystem in the absence of hard corals. Re-colonization of soft corals on the degraded reefs is among the first steps to make them to recover gradually. Present Line Intercept Transect survey (LIT) conducted in a reef of the Gulf inferred the possibility to recovery of the reefs due to the colonization of soft corals on the bare coral boulders.
This document discusses marine biodiversity and conservation efforts in Singapore. It notes that Singapore has over 7,000 marine species despite being highly urbanized. Some key threats to marine habitats are coastal development, pollution, and warming oceans. Singapore has undertaken various conservation efforts like coral relocation projects, artificial reef structures, coral nurseries, and mangrove restoration. Ongoing work includes species monitoring, education, and engaging the public in conservation.
A study on the biodiversity of snake island in South Andaman - JBESInnspub Net
Snake Island is an uninhabited small rocky islet off Carbyn’s Cove in Port Blair, Andaman. The biodiversity of this rocky island is its distinctive feature as it becomes a small habitat for various organisms close to the open sea. During this present study a total no. of 217 species were recorded out of which 205 has been identified. Pisces was the dominant group, followed by cnidarians, molluscs, arthropods etc. The island is highly influenced by sea water as during high tides nearly 75 % of the island is submerged by seawater. This is the reason of dominance of marine organisms (94 %) over terrestrial organisms (6 %) in the island. Another characteristic feature of the island is the formation of numerous rocky and sandy water channels and the presence of a ‘coral pool’ at the end of one such channel on the north-eastern part of the island. During high tide these channels are filled with water and exchange of seawater takes place in the coral pool, where highest diversity of species was observed. Lack of intertidal species in the island is evident due to the high action of waves from the open sea and lack of hiding areas other than rocky crevices. Get more articles at: http://www.innspub.net/volume-6-number-4-april-2015-jbes/
- The study examined the distribution and identification of tuna larvae in the Phoenix Islands Protected Area from July to August 2014 through 49 sampling stations and 80 net samples.
- Tuna larvae accounted for only 4% of total larval fish collected but represented 3 of the 4 main commercial tuna species. Yellowfin tuna larvae were the most common.
- Larvae were concentrated near seamounts and islands and in the mixed layer above 100m. Meter nets in the mixed layer were the most effective sampling method.
- The data suggests the tuna fishery in the PIPA may be overfished given the low tuna larvae counts retrieved.
Satellite remote sensing is beginning to play an important role in locating potential fishing zones and managing fishery resources by measuring ocean parameters like sea temperature and color from space. Changes in ocean conditions influence fish stocks, so remote sensing provides information on ocean variations and their effects on fish distribution. In India, satellite data on sea surface temperature and chlorophyll are used by INCOIS to create maps of potential fishing zones distributed weekly to fishermen. Remote sensing allows fishermen to reduce scouting time and fuel use locating fishing zones, and provides data for fishery management decisions and assessing fish stocks.
Spatial Mapping: Diversity and Distribution of Demersal Fish in the Southern ...robert peranginangin
In the future, fisheries management must not be based on biomass measure only, but must use an integrated ecosystem approach. This study was aimed to discover the species diversity level of demersal fish resources in spatial distribution and its relation to the environment. The study was conducted in May and June 2015 by operating a trawl in the assigned stations. The spatial distribution was based on the Bray-Curtis index which divided the distribution of demersal fish resources into three clusters. Inshore sites of Kalimantan’s western waters (KLBR) was dominated by Leognathidae, inshore sites of the eastern of Riau Islands waters (KPRI) was dominated by Lutjanidae, and offshore sites of the southern of South China Sea (SSCS) was dominated by Nemipteridae. Offshore sites of the southern of South China Sea (SSCS) had a much better community stability level than that of inshore sites of Kalimantan’s western waters (KLBR) and inshore sites of the eastern of Riau Islands waters (KPRI). This study also demonstrated that environmental factors such as depth, sediment type, salinity, and temperature, affect the distribution and species diversity of demersal fish communities in the southern of South China Sea.
The document discusses the threats facing the endangered Bank Cormorant population in southern Africa and potential implications of its extinction. It outlines several threats driving the species' decline, including oil spills, shifts in prey distribution from overfishing, and increased predation from seals. Conservation efforts discussed include marine protected areas, rehabilitation of oiled birds, population surveys, and attempts to establish an ex situ breeding population to supplement wild numbers. The loss of Bank Cormorants could trigger a trophic cascade affecting other species through reduced control of mesopredators like lobsters and gobies. With continued conservation actions, the document argues it is possible to halt their decline.
This study analyzed the stomach contents and stable isotope ratios of over 960 juvenile fish and their potential food sources from pelagic and littoral habitats in the tidal freshwater region of the San Francisco Estuary. The results showed evidence of two predominant food web pathways. Pelagic fish and some littoral fish relied on a zooplankton-phytoplankton trophic pathway, while the majority of littoral fish had diets and carbon isotope ratios consistent with energy from submerged aquatic vegetation and epiphytic macroalgae. Analysis with a mixing model revealed that littoral fish obtained the overall majority of their nutrition from consuming grazer amphipods. Examining both stable isot
This study is an attempt to understand the population characteristics such as Length-weight relationships, age, growth, mortality, length at age and exploitation rate of Frigate tuna, Auxis thazard occurring in the North west coast of India. The data collected from various fish landing centers from 2008 to 2012 were considered for this study. The mean fork length and weight 32.35 cm and 1.040 kg were observed respectively. The length-weight relationship W=2.4321x10-1 FL 2.27658, and r2 0.9576 was obtained. The value of ‘b’ found to be less than 3 and hence this species is showing negative allometric growth. The growth parameters on von Bertalanffy for L∞ estimated as 47.03, K was 1.30 and to was -0.23. The Phi-prime value (⏀) of 3.33 was derived. The length at age observed at the end of 1 to 4 years was 27.0, 42.0, 50.0 and 55.0 cm year-1 respectively. The natural mortality (M) 1.00 year-1, total mortality (Z) of 4.43 year-1 and fishing mortality (F) 3.43 year-1 were derived with the mean temperature of 27°C. The exploitation ratio(E) and exploitation rate(U) was 0.77. The results derived in the present study with regard to population characteristics of frigate tuna in the coastal waters of North west coast of India indicate catching of this species in the area to be minimized Key-words- Length-weight relationships, Mortality, Length at age, Exploitation ratio, Exploitation rate
This presentation was delivered by Eric Baran, Tuantong Jutagate and Kithya Ouch at the Lancang – Mekong Environmental Study Workshop that took place at the 2016 Greater Mekong Forum on Water, Food and Energy.
The presentation describes the status of fish biodiversity and fisheries between Chiang Saen and Luang Prabang.
Species Diversity of Polychaete Worms from Some Selected Freshwater Environme...ijtsrd
The number of freshwater species in the world is quite small when compared with the vast number of marine species. There are several marine forms which are penetrated brackish and freshwater but remain unable to breed there while others have adapted sufficiently to remain for their entire life span. Polychaetes are commonly found in Indian estuaries, among 152 species recorded, 119 species from the east coast, 10 species from both east and west coasts. A total of 8 species were identified along Thenkasi District. Macro benthic polychaetes highlighted the presence of indicator species at all stations. Most of the benthic studies explored that Nereididae is the dominant species. The polychaetes observed throughout this study were a similar size and this is a clear indication of extreme disturbance imposed on the sediment. The present findings show macrobenthic polychaete diversity rich all along the Thenkasi District of Tamil Nadu. S. Balasubramanian | T. Citarasu | S. Lazarus | A. Renu "Species Diversity of Polychaete Worms from Some Selected Freshwater Environment of Thenkasi District, Tamil Nadu" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26516.pdfPaper URL: https://www.ijtsrd.com/biological-science/zoology/26516/species-diversity-of-polychaete-worms-from-some-selected-freshwater-environment-of-thenkasi-district-tamil-nadu/s-balasubramanian
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
Marine Reserves in the Philippines: Challenges, Success and Perspectives (IWC...Iwl Pcu
E. D. Gomez and P. M. Aliño, The Marine Science Institute, University of the Philippines, Diliman, Quezon City, Philippines'
Presentation given during the 5th GEF Biennial International Waters Conference in Cairns, Australia (during the pre-conference workshop marine ecosystems, Global Change and Marine Resources).
2011 nutrient enrichment caused by marine cageearambulm3
This document summarizes a study that evaluated the influence of marine cage aquaculture on coral reef communities in turbid waters near Penghu Islands, Taiwan. The study found that levels of ammonium, nitrite, and chlorophyll a released from fish cages distinguished the area closest to the cages (Impact Zone 1) from areas further away (Impact Zone 2 and the reference zone). Coral communities closest to the cages were dominated by stress-tolerant coral species while areas further away supported more diverse coral morphologies. The results suggest that nutrient enrichment from the fish cages is deteriorating suitable habitat for coral reef organisms at the study site.
Coral population dynamics across consecutive massmortality e.docxvanesaburnand
Coral population dynamics across consecutive mass
mortality events
B E R N H A R D R I E G L and SAM PURKIS
National Coral Reef Institute, Nova Southeastern University, 8000 N Ocean Drive, Dania, FL 33004, USA
Abstract
Annual coral mortality events due to increased atmospheric heat may occur regularly from the middle of the century
and are considered apocalyptic for coral reefs. In the Arabian/Persian Gulf, this situation has already occurred and
population dynamics of four widespread corals (Acropora downingi, Porites harrisoni, Dipsastrea pallida, Cyphastrea
micropthalma) were examined across the first-ever occurrence of four back-to-back mass mortality events (2009–2012).
Mortality was driven by diseases in 2009, bleaching and subsequent diseases in 2010/2011/2012. 2009 reduced P. har-
risoni cover and size, the other events increasingly reduced overall cover (2009: �10%; 2010: �20%; 2011: �20%; 2012:
�15%) and affected all examined species. Regeneration was only observed after the first disturbance. P. harrisoni and
A. downingi severely declined from 2010 due to bleaching and subsequent white syndromes, while D. pallida and
P. daedalea declined from 2011 due to bleaching and black-band disease. C. microphthalma cover was not affected. In
all species, most large corals were lost while fission due to partial tissue mortality bolstered small size classes. This
general shrinkage led to a decrease of coral cover and a dramatic reduction of fecundity. Transition matrices for dis-
turbed and undisturbed conditions were evaluated as Life Table Response Experiment and showed that C. microph-
thalma changed the least in size-class dynamics and fecundity, suggesting they were ‘winners’. In an ordered
‘degradation cascade’, impacts decreased from the most common to the least common species, leading to step-wise
removal of previously dominant species. A potentially permanent shift from high- to low-coral cover with different
coral community and size structure can be expected due to the demographic dynamics resultant from the distur-
bances. Similarities to degradation of other Caribbean and Pacific reefs are discussed. As comparable environmental
conditions and mortality patterns must be expected worldwide, demographic collapse of many other coral popula-
tions may soon be widespread.
Keywords: climate change, coral reef, demographics, mass mortality, population dynamics
Received 13 March 2015; revised version received 26 May 2015 and accepted 29 May 2015
Introduction
Coral reefs are among the most sensitive ecosystems to
excursions from mean environmental conditions, such
as temperature, UV irradiation, and nutrient levels and
suffer heavy mortality from consequent bleaching and
diseases (Hoegh-Guldberg et al., 2007; Selig et al., 2010;
Wiedenmann et al., 2013; D’Angelo & Wiedenmann,
2014; Riegl et al., 2015). Rising global temperatures and
alterations in nutrient dynamics are predicted to fur-
ther increase the frequenc.
Factors Contributing to the Decline of the Anchovy Fisheries in Krueng Raya B...Zulhamsyah Imran
This document summarizes a study on factors contributing to the decline of anchovy fisheries in Krueng Raya Bay, Indonesia. The study found that anchovy production peaked at 2,072 tons in 1999 but declined sharply to 171 tons after the 2004 tsunami. While production fluctuated between 126-279 tons from 2006-2012, it remained well below pre-tsunami and predicted maximum sustainable yield levels. The decline is attributed to increasing fishing effort through more lift net boats, destructive fishing gears, and degradation of coral reefs and mangroves from pollution and other human impacts. The tsunami exacerbated the decline but other anthropogenic factors likely had a greater long-term impact on depleting the anchovy stocks.
This document provides an assessment of marine conservation and management in the Baja California region of Mexico. It summarizes the key biodiversity and ecosystems found in the region, including mangroves, kelp forests, and the pelagic ecosystem. The biodiversity of the region is threatened by overfishing, climate change, and poor resource management. The document evaluates oceanographic influences, the state of coastal and pelagic ecosystems, marine food production, ecosystem management challenges, and makes recommendations to improve conservation and management of the region's marine resources.
Aspects of life-history strategy of Marcusenius senegalensis (Pisces: Osteogl...AI Publications
Marcusenius senegalensis (Steindachner, 1870) is the dominant mormyrid in Niger River in Northern-Benin where this fish species constitutes an important component of artisanal fisheries. The current study documented the reproductive biology of M. senegalensis in order to contribute to management and sustainable exploitation. Monthly samplings were conducted between February 2015 and July 2016 using gillnets, cast net, and seine. Males dominated the population with a sex ratio of 1:0.96 in favor of males. Sizes at first sexual maturity were 167.89 mm-TL for males and 163.81 mm-TL for females. Monthly gonadosomatic index (GSI) averaged 0.12 ± 0.09 for males and 1.32 ± 1.56 for female and peaks recorded indicated that spawning occured from June to September. Fecundity were moderate to low (844 – 12,643 eggs) and significantly (p < 0.05) increased with total length and body weight. Thespecies showed egg diameters varying between 0.21 and to 1.77 mm and ovaries comprised oocytes at all stages of maturation indicating that M. senegalensis displayed a multi-spawning behavior. Marcuseniussenegalensis exhibited a demographic strategy between r and K, yet more inclined towards K-selected strategy. In Niger River, reproduction grounds were being severely degraded affecting recruitment and stocks. The current findings are valuable data to design a species management scheme that should includes spawning ground protection, species conservation and valorization and fisheries/aquaculture development.
Fish farming involves raising fish commercially in tanks or enclosures for food. It is the principal form of
aquaculture. Worldwide, the most important farmed fish species are carp, tilapia, salmon, and catfish. Satellites can
be used to monitor global fishing practices and check countries' reported data. GIS is a system used to store, analyze,
and manage geospatial data to support natural resource planning and management, including fisheries. In Bangladesh,
GIS is being used as a decision support system for fisheries and aquaculture management.
Mass bleaching of corals in 2010 seriously affected the corals in Andaman group of islands. Rise in Sea Surface Temperature (SST) was the primary reason due to less than normal rainfall during the bleaching period. Now three years after the bleaching episode the corals in South Andaman seems to recovering. The primary indicator of recovery being the new recruitment of corals especially Acropora spp. (branching corals) throughout the reef areas along with the increase in overall live coral cover. Multiple surveys were conducted in three stations viz. North Bay, Chidiyatapu and Marina Park along the eastern coast of South Andaman during this study and all the sites were found to have new recruitment of Acropora spp. which were severely affected during 2010 mass bleaching.
Koaro are a species of freshwater fish found throughout New Zealand. They undergo an amphidromous life cycle where larvae hatch in freshwater and migrate to the ocean before returning to freshwater as juveniles. As adults, koaro can reach up to 280mm in length and live over 15 years. They have morphological adaptations like ventrally flared fins that allow them to climb waterfalls up to 30m high. While koaro have a wide distribution and large population, some populations have declined due to threats like trout predation and habitat loss. Their conservation status is listed as "at risk - declining".
Re-Colonizing Soft Corals on the Degraded Coral Reefs of Gulf Of Kachchh Mari...paperpublications3
Abstract: Coral reefs of the Gulf of Kachchh are in a highly degraded condition, when compared with other three major coral reef regions of India. In correlation with geographical and oceanographical changes, its arid climate and the semi-diurnal tidal amplitudes fluctuations hamper the recovery of the reef. Soft corals may play the alternative key role in maintaining the ecological role in the degraded reef ecosystem in the absence of hard corals. Re-colonization of soft corals on the degraded reefs is among the first steps to make them to recover gradually. Present Line Intercept Transect survey (LIT) conducted in a reef of the Gulf inferred the possibility to recovery of the reefs due to the colonization of soft corals on the bare coral boulders.
This document discusses marine biodiversity and conservation efforts in Singapore. It notes that Singapore has over 7,000 marine species despite being highly urbanized. Some key threats to marine habitats are coastal development, pollution, and warming oceans. Singapore has undertaken various conservation efforts like coral relocation projects, artificial reef structures, coral nurseries, and mangrove restoration. Ongoing work includes species monitoring, education, and engaging the public in conservation.
A study on the biodiversity of snake island in South Andaman - JBESInnspub Net
Snake Island is an uninhabited small rocky islet off Carbyn’s Cove in Port Blair, Andaman. The biodiversity of this rocky island is its distinctive feature as it becomes a small habitat for various organisms close to the open sea. During this present study a total no. of 217 species were recorded out of which 205 has been identified. Pisces was the dominant group, followed by cnidarians, molluscs, arthropods etc. The island is highly influenced by sea water as during high tides nearly 75 % of the island is submerged by seawater. This is the reason of dominance of marine organisms (94 %) over terrestrial organisms (6 %) in the island. Another characteristic feature of the island is the formation of numerous rocky and sandy water channels and the presence of a ‘coral pool’ at the end of one such channel on the north-eastern part of the island. During high tide these channels are filled with water and exchange of seawater takes place in the coral pool, where highest diversity of species was observed. Lack of intertidal species in the island is evident due to the high action of waves from the open sea and lack of hiding areas other than rocky crevices. Get more articles at: http://www.innspub.net/volume-6-number-4-april-2015-jbes/
- The study examined the distribution and identification of tuna larvae in the Phoenix Islands Protected Area from July to August 2014 through 49 sampling stations and 80 net samples.
- Tuna larvae accounted for only 4% of total larval fish collected but represented 3 of the 4 main commercial tuna species. Yellowfin tuna larvae were the most common.
- Larvae were concentrated near seamounts and islands and in the mixed layer above 100m. Meter nets in the mixed layer were the most effective sampling method.
- The data suggests the tuna fishery in the PIPA may be overfished given the low tuna larvae counts retrieved.
Satellite remote sensing is beginning to play an important role in locating potential fishing zones and managing fishery resources by measuring ocean parameters like sea temperature and color from space. Changes in ocean conditions influence fish stocks, so remote sensing provides information on ocean variations and their effects on fish distribution. In India, satellite data on sea surface temperature and chlorophyll are used by INCOIS to create maps of potential fishing zones distributed weekly to fishermen. Remote sensing allows fishermen to reduce scouting time and fuel use locating fishing zones, and provides data for fishery management decisions and assessing fish stocks.
Spatial Mapping: Diversity and Distribution of Demersal Fish in the Southern ...robert peranginangin
In the future, fisheries management must not be based on biomass measure only, but must use an integrated ecosystem approach. This study was aimed to discover the species diversity level of demersal fish resources in spatial distribution and its relation to the environment. The study was conducted in May and June 2015 by operating a trawl in the assigned stations. The spatial distribution was based on the Bray-Curtis index which divided the distribution of demersal fish resources into three clusters. Inshore sites of Kalimantan’s western waters (KLBR) was dominated by Leognathidae, inshore sites of the eastern of Riau Islands waters (KPRI) was dominated by Lutjanidae, and offshore sites of the southern of South China Sea (SSCS) was dominated by Nemipteridae. Offshore sites of the southern of South China Sea (SSCS) had a much better community stability level than that of inshore sites of Kalimantan’s western waters (KLBR) and inshore sites of the eastern of Riau Islands waters (KPRI). This study also demonstrated that environmental factors such as depth, sediment type, salinity, and temperature, affect the distribution and species diversity of demersal fish communities in the southern of South China Sea.
The document discusses the threats facing the endangered Bank Cormorant population in southern Africa and potential implications of its extinction. It outlines several threats driving the species' decline, including oil spills, shifts in prey distribution from overfishing, and increased predation from seals. Conservation efforts discussed include marine protected areas, rehabilitation of oiled birds, population surveys, and attempts to establish an ex situ breeding population to supplement wild numbers. The loss of Bank Cormorants could trigger a trophic cascade affecting other species through reduced control of mesopredators like lobsters and gobies. With continued conservation actions, the document argues it is possible to halt their decline.
This study analyzed the stomach contents and stable isotope ratios of over 960 juvenile fish and their potential food sources from pelagic and littoral habitats in the tidal freshwater region of the San Francisco Estuary. The results showed evidence of two predominant food web pathways. Pelagic fish and some littoral fish relied on a zooplankton-phytoplankton trophic pathway, while the majority of littoral fish had diets and carbon isotope ratios consistent with energy from submerged aquatic vegetation and epiphytic macroalgae. Analysis with a mixing model revealed that littoral fish obtained the overall majority of their nutrition from consuming grazer amphipods. Examining both stable isot
This study is an attempt to understand the population characteristics such as Length-weight relationships, age, growth, mortality, length at age and exploitation rate of Frigate tuna, Auxis thazard occurring in the North west coast of India. The data collected from various fish landing centers from 2008 to 2012 were considered for this study. The mean fork length and weight 32.35 cm and 1.040 kg were observed respectively. The length-weight relationship W=2.4321x10-1 FL 2.27658, and r2 0.9576 was obtained. The value of ‘b’ found to be less than 3 and hence this species is showing negative allometric growth. The growth parameters on von Bertalanffy for L∞ estimated as 47.03, K was 1.30 and to was -0.23. The Phi-prime value (⏀) of 3.33 was derived. The length at age observed at the end of 1 to 4 years was 27.0, 42.0, 50.0 and 55.0 cm year-1 respectively. The natural mortality (M) 1.00 year-1, total mortality (Z) of 4.43 year-1 and fishing mortality (F) 3.43 year-1 were derived with the mean temperature of 27°C. The exploitation ratio(E) and exploitation rate(U) was 0.77. The results derived in the present study with regard to population characteristics of frigate tuna in the coastal waters of North west coast of India indicate catching of this species in the area to be minimized Key-words- Length-weight relationships, Mortality, Length at age, Exploitation ratio, Exploitation rate
This presentation was delivered by Eric Baran, Tuantong Jutagate and Kithya Ouch at the Lancang – Mekong Environmental Study Workshop that took place at the 2016 Greater Mekong Forum on Water, Food and Energy.
The presentation describes the status of fish biodiversity and fisheries between Chiang Saen and Luang Prabang.
Species Diversity of Polychaete Worms from Some Selected Freshwater Environme...ijtsrd
The number of freshwater species in the world is quite small when compared with the vast number of marine species. There are several marine forms which are penetrated brackish and freshwater but remain unable to breed there while others have adapted sufficiently to remain for their entire life span. Polychaetes are commonly found in Indian estuaries, among 152 species recorded, 119 species from the east coast, 10 species from both east and west coasts. A total of 8 species were identified along Thenkasi District. Macro benthic polychaetes highlighted the presence of indicator species at all stations. Most of the benthic studies explored that Nereididae is the dominant species. The polychaetes observed throughout this study were a similar size and this is a clear indication of extreme disturbance imposed on the sediment. The present findings show macrobenthic polychaete diversity rich all along the Thenkasi District of Tamil Nadu. S. Balasubramanian | T. Citarasu | S. Lazarus | A. Renu "Species Diversity of Polychaete Worms from Some Selected Freshwater Environment of Thenkasi District, Tamil Nadu" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26516.pdfPaper URL: https://www.ijtsrd.com/biological-science/zoology/26516/species-diversity-of-polychaete-worms-from-some-selected-freshwater-environment-of-thenkasi-district-tamil-nadu/s-balasubramanian
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
Marine Reserves in the Philippines: Challenges, Success and Perspectives (IWC...Iwl Pcu
E. D. Gomez and P. M. Aliño, The Marine Science Institute, University of the Philippines, Diliman, Quezon City, Philippines'
Presentation given during the 5th GEF Biennial International Waters Conference in Cairns, Australia (during the pre-conference workshop marine ecosystems, Global Change and Marine Resources).
2011 nutrient enrichment caused by marine cageearambulm3
This document summarizes a study that evaluated the influence of marine cage aquaculture on coral reef communities in turbid waters near Penghu Islands, Taiwan. The study found that levels of ammonium, nitrite, and chlorophyll a released from fish cages distinguished the area closest to the cages (Impact Zone 1) from areas further away (Impact Zone 2 and the reference zone). Coral communities closest to the cages were dominated by stress-tolerant coral species while areas further away supported more diverse coral morphologies. The results suggest that nutrient enrichment from the fish cages is deteriorating suitable habitat for coral reef organisms at the study site.
Coral population dynamics across consecutive massmortality e.docxvanesaburnand
Coral population dynamics across consecutive mass
mortality events
B E R N H A R D R I E G L and SAM PURKIS
National Coral Reef Institute, Nova Southeastern University, 8000 N Ocean Drive, Dania, FL 33004, USA
Abstract
Annual coral mortality events due to increased atmospheric heat may occur regularly from the middle of the century
and are considered apocalyptic for coral reefs. In the Arabian/Persian Gulf, this situation has already occurred and
population dynamics of four widespread corals (Acropora downingi, Porites harrisoni, Dipsastrea pallida, Cyphastrea
micropthalma) were examined across the first-ever occurrence of four back-to-back mass mortality events (2009–2012).
Mortality was driven by diseases in 2009, bleaching and subsequent diseases in 2010/2011/2012. 2009 reduced P. har-
risoni cover and size, the other events increasingly reduced overall cover (2009: �10%; 2010: �20%; 2011: �20%; 2012:
�15%) and affected all examined species. Regeneration was only observed after the first disturbance. P. harrisoni and
A. downingi severely declined from 2010 due to bleaching and subsequent white syndromes, while D. pallida and
P. daedalea declined from 2011 due to bleaching and black-band disease. C. microphthalma cover was not affected. In
all species, most large corals were lost while fission due to partial tissue mortality bolstered small size classes. This
general shrinkage led to a decrease of coral cover and a dramatic reduction of fecundity. Transition matrices for dis-
turbed and undisturbed conditions were evaluated as Life Table Response Experiment and showed that C. microph-
thalma changed the least in size-class dynamics and fecundity, suggesting they were ‘winners’. In an ordered
‘degradation cascade’, impacts decreased from the most common to the least common species, leading to step-wise
removal of previously dominant species. A potentially permanent shift from high- to low-coral cover with different
coral community and size structure can be expected due to the demographic dynamics resultant from the distur-
bances. Similarities to degradation of other Caribbean and Pacific reefs are discussed. As comparable environmental
conditions and mortality patterns must be expected worldwide, demographic collapse of many other coral popula-
tions may soon be widespread.
Keywords: climate change, coral reef, demographics, mass mortality, population dynamics
Received 13 March 2015; revised version received 26 May 2015 and accepted 29 May 2015
Introduction
Coral reefs are among the most sensitive ecosystems to
excursions from mean environmental conditions, such
as temperature, UV irradiation, and nutrient levels and
suffer heavy mortality from consequent bleaching and
diseases (Hoegh-Guldberg et al., 2007; Selig et al., 2010;
Wiedenmann et al., 2013; D’Angelo & Wiedenmann,
2014; Riegl et al., 2015). Rising global temperatures and
alterations in nutrient dynamics are predicted to fur-
ther increase the frequenc.
Factors Contributing to the Decline of the Anchovy Fisheries in Krueng Raya B...Zulhamsyah Imran
This document summarizes a study on factors contributing to the decline of anchovy fisheries in Krueng Raya Bay, Indonesia. The study found that anchovy production peaked at 2,072 tons in 1999 but declined sharply to 171 tons after the 2004 tsunami. While production fluctuated between 126-279 tons from 2006-2012, it remained well below pre-tsunami and predicted maximum sustainable yield levels. The decline is attributed to increasing fishing effort through more lift net boats, destructive fishing gears, and degradation of coral reefs and mangroves from pollution and other human impacts. The tsunami exacerbated the decline but other anthropogenic factors likely had a greater long-term impact on depleting the anchovy stocks.
Diversity of fisheries in Sarawak, Northwest Borneo: Present status and conse...AbdullaAlAsif1
Information on fisheries resources in East Malaysia is scarce and poorly known. The current review aims to compile a checklist of fisheries resources in the Northwest Borneo (Sarawak, Malaysia) from available published literature, address the resources' present status, and suggest future monitoring needs for selected critical species. The study also aims to determine several Sarawak land-use issues that are in flux and responsible for habitat degradation. Five hundred sixty-four species belonging to 123 families and 32 orders were recorded from Sarawak waters. Freshwater fish species comprised 48.0% of the total, followed by a marine (36.6%), marine-euryhaline (12.9%), and brackish water (2.5%) species. Of this, Cyprinidae was the most dominant group accounting for the greatest number of species (82 species), followed by Balitoridae (34 species), Bagridae (21 species) and Penaeidae (21 species). Therefore, available fisheries resources should be managed carefully as 48 species (9.0%) are currently vulnerable to extinction. Furthermore, the presence of 20 alien species in Sarawak water bodies also requires attention from the authorities due to the potential disruption of aquatic ecological balance. Changing land use issues in Sarawak such as forest degradation, agricultural expansion, peatland deforestation and conversion, logging, destruction of mangrove forests, and construction of hydroelectric power dams and flood mitigation channels pose significant challenges to fishery management in Sarawak. Our study documents the priority of fishery monitoring and conservation in Sarawak water bodies to ensure sustainable management of fisheries resources.
(FINAL) ROUGH DRAFT FOR SENIOR RESEARCH Jennifer Edit 4-14-15Jennifer Cherry
This document is a senior research paper that analyzes temporal and spatial trends in sea turtle strandings and nesting in Volusia County, Florida from 1989-2012. It finds that sea turtle strandings in Volusia County have increased over time and are correlated with increases in both the county and state human populations. Strandings are dominated by loggerhead and green sea turtles. Despite rising strandings, nesting numbers have also increased, likely due to the county's aggressive nest protection programs. The analysis aims to better understand relationships between strandings, nesting, human activities, and environmental factors like temperature to inform sea turtle conservation efforts.
The Koala Coast region of South East Queensland has experienced rapid declines in Koala populations between 1996-2013 due to habitat loss and urban development. Analysis of population data revealed:
1) A 66.3% overall decline, with declines of 24.7% in bushland, 98% in remnant patches, and 121.1% in urban areas.
2) Mean densities declined from 0.15 koala/ha to 0.11 koala/ha in bushland, 0.4 koala/ha to 0.09 koala/ha in remnants, and 0.15 koala/ha to 0.12 koala/ha in urban areas.
3) The stee
Zooplankton species composition and diversity in the seagrass habitat of Lawa...AbdullaAlAsif1
Seagrass habitats are considered to be some of the most biodiverse ecosystems on the planet and safeguard some ecologically and economically important fauna, amongst which are some globally threatened species, including dugong. Malaysian seagrass ecosystems are not widespread, but their existence supports some significant marine fauna. A rigorous zooplankton study was conducted from May 2016 to February 2017, in the seagrass habitat of Lawas, Sarawak, Malaysia, to examine their temporal composition and diversity, together with their ecological influences. A total of 45 zooplankton species from 13 significant groups were recorded in the seagrass habitat. The population density of zooplankton ranged between 2,482 ind/m³ and 22,670 ind/m³ over three different seasons. A single zooplankton copepod was found to be dominant (47.40%), while bivalves were the second largest (31.8%) group in terms of total abundance. It was also noticed that the average relative abundance (0.62) and important species index (62.08) of copepods were higher than for other groups that exist in the seagrass meadow, whereas copepod Parvocalanus crassirostris showed both the highest average relative abundance (0.41) and the highest important species index (41.15). The diversity (H') and richness index of the intermediate season were found to be highest due to favourable physico-chemical conditions. Within the referred seasonal cluster, the wet and dry seasons were almost similar in terms of species abundance, while the intermediate season was distinct, with high species diversity backed by ANOSIM analysis results. Copepod and bivalves formed one group with a common similarity level of 0.80. The CCA (Canonical Correspondence Analysis) model established that abiotic factors, especially turbidity, NO , rainfall, dissolved oxygen and pH were significantly correlated with abundance of individual groups of zooplankton. Zooplankton assemblage and abundance in Lawas were found to be very rich in multiple seasons, indicating that the productivity of uninterrupted seagrass habitat might be high and the system rich in biodiversity.
Z & edwards (2011) extinction of a shark population in the archipelago of sai...Projeto Golfinho Rotador
This document discusses the extinction of reef sharks (Carcharhinus spp.) from the remote Archipelago of Saint Paul's Rocks in the equatorial Atlantic. The authors review historical records from visits to the archipelago dating back to the mid-20th century, which consistently noted the presence of many sharks. However, more recent expeditions in the last decade have found no reef sharks despite extensive underwater surveys. All analyses conclude that one species, Carcharhinus galapagensis, is now locally extinct at the archipelago following a sharp decline after the start of commercial fishing in the 1950s. The related species Carcharhinus falciformis may still occasionally visit but no longer has a resident population due to
1
Tourist
(Main)
246 May–June
2010
Self-administered
questionnaire
Demographic characteristics; motivations to visit Palau; satisfaction and expenditures on: diving, shark
diving, accommodation, other activities and living costs while in Palau; knowledge of the shark sanctuary and
influence on decision to visit
Dive operator 10 May–June
2010
Face-to-face
interview
Business profile; number of clients; shark-diving activities; revenues and costs; employment; perceptions of
the shark-diving industry and shark sanctuary
Dive guide 20 May–June
2010
Face-to-face
interview
Employment profile; number
The document summarizes threats to peatlands in the Congo Basin, which were recently discovered to be the largest tropical peatland complex globally. Climate change is identified as a major threat given its potential to destabilize the entire area's large carbon stocks. Socioeconomic development is increasing risks like hydrocarbon exploration, logging, and plantations. While conservation designations cover much of the area, threats could significantly damage the peatland ecosystems. Immediate action is needed to protect the largely intact peatlands and their carbon while improving local livelihoods.
Changing patch dynamics of Cape eelgrass Zostera capensis: impacts of loss on...Joseph Galaske
The cape eelgrass Zostera capensis is an ecosystem engineer endemic to South Africa. Given its rapid decline in recent years, this study aimed to address the following: (1) Do total area and patch dynamics change over time? (2) Do these trends impact patch quality? (3) How does this affect epifaunal communities? Using satellite imagery, we discovered fragmentation and a net loss of 47% in seagrass beds from 2009 to 2015.
1. The document discusses field research conducted at Kimmeridge Bay, Dorset, which involved mapping the marine biotopes and assessing species assemblages in relation to habitat classifications. Several distinct biotopes were identified and classified.
2. It also assesses the conservation importance of two barnacle species, Chthamalus montagui and C. stellatus, which reach their northern distribution limits in the area. These species are important indicators for studying recruitment and survival under natural conditions.
3. The discussion section justifies the use of marine protected areas along the Dorset coast to conserve habitats and species of conservation interest, noting the need for balanced management that considers socio-economic impacts.
This document summarizes a study on the metapopulation structure of Sacramento splittail, a semi-anadromous fish species in the San Francisco Estuary. The study found that there are two genetically distinct splittail populations that spawn in different tributaries but overlap in other areas. The populations are connected when climate patterns produce sufficient freshwater flows to connect their habitats. Using genetic and otolith microchemistry markers on fish sampled from different areas, the study aimed to understand connectivity between the populations and assess if they function as distinct evolutionarily significant units or as a metapopulation. The dynamic connectivity between the populations, controlled by variable climate, may be an important driver of gene flow.
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
Population dynamics of tinfoil barb, barbonymus schwanenfeldii (bleeker, 1853...Alexander Decker
1. Tinfoil barb (Barbonymus schwanenfeldii) was the dominant fish species found in Pedu Reservoir, comprising 38.9% of total catch.
2. Analysis of the length-frequency data showed B. schwanenfeldii could attain a maximum length (L∞) of 30.95 cm with a growth rate (K) of 0.66 yr-1.
3. Estimates of total mortality (Z), natural mortality (M), and fishing mortality (F) for B. schwanenfeldii were 2.01, 1.37, and 0.64 yr-1 respectively, indicating potential for a slight increase
PhD confirmation - ecology of estuarine sharks & rayssharonle
This is a ppt that was used in my confirmation for candidature. It describes how I will use stable isotope and fatty acid analysis to determine what estuarine sharks and rays eat and which areas of the South Alligator River, (NT, Aus) they utilise. This will then inform environmental managers of which areas are critical to the survival of these species.
Past, Present and Future Impacts of Climate Change on High Arctic Canadian Ca...AmySpencerHarff
This document discusses how climate change is impacting Canadian Arctic caribou populations, specifically the Peary caribou and Dolphin and Union caribou. These populations have declined dramatically in recent decades due to factors exacerbated by climate change, such as increased exposure to parasites and extreme weather events. The document provides background on these caribou subspecies and their importance to Indigenous communities. It then examines how climate change has impacted these populations in the past and present through changing seasonal patterns, parasites, and weather. The objectives are to understand how climate change may further threaten these caribou in the future and help prevent additional population declines.
“Coral reefs represent some of the world's most spectacular beauty spots, but they are also the foundation of marine life: without them many of the seas most exquisite species will not survive”
~ Sheherazade Goldsmith
“Coral is a very beautiful and unusual animal. Each coral head consists of thousand individual polyps. These polyps are continually budding and branching into genetically identical neighbors”
~ Antony Garrett Lisi
“The ocean stirs the heart, inspires the imagination and brings etrnal joy to the soul”
~ Wyland
This document reviews Korean hatchery culture techniques for sea cucumbers and their potential application to culturing the local sea cucumber species Cucumaria frondosa in the Northeast U.S. It describes the life history and biology of C. frondosa as well as Korean hatchery facilities, culture tanks, equipment, and techniques for spawning and rearing the Japanese sea cucumber Apostichopus japonicus which could potentially be adapted for culturing C. frondosa.
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.
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