As biology Field work 2010 workbook


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As biology Field work 2010 workbook

  1. 1. 1 FEB 12- 15 2014.
  2. 2. 2 THE COASTAL FOREST. Make your own observations during this field trip and answer the following questions. a) Name the dominant plant species in the coastal bush. b) List down the animals that live within the bush. c) Attempt a classification of one named species of plant or animal according to the taxonomic groups below. kingdom _________________________ Phylum __________________________ Class ___________________________ Order ___________________________ Family ___________________________ Genus ____________________________ Species ___________________________
  3. 3. 3 d) Identify and explain the adaptations of the plants to avoid excessive water loss. e) Draw a possible food web for the forest.
  4. 4. 4 The Ghost crab Carefully examine the behaviour of the ghost crab as the tide returns and suggest scientific explanations for such unique behaviour. Catch one of the crabs and examine it carefully using the hand lens. Draw a diagram of the specimen and identify any adaptive features of the organism to life on the shore. Write down a food chain including the ghost crab
  5. 5. 5 Dissect the ghost crab and examine the respiratory and digestive system Draw a diagram of the digestive system
  6. 6. 6 Collection, examination and identification of organisms. It is impossible to make an exhaustive survey, counting and mapping every individual organism on the shore, so we will need to sample just part of the area. If this is done carefully, then you can assume that your sample provides a fair picture of the overall species distribution in the area. Using forceps or gloves collect a sample of each representative plant and animal species and put them in your sample containers for examination and identification later. You should work in pairs to avoid removing many organisms from their natural habitats. Make a list of the organisms collected, arranged taxonomically and identified as far as possible. Use the sketch map of the area to mark places on the map where the organisms identified were located.
  7. 7. 7 Use the general collection sheet to fill in names, location and adaptations of the organism and a sketch drawing of the organism General collection sheet Organism Location and adaptations Sketch Diagram
  8. 8. 8 Organism Location and adaptations Sketch/ Diagram
  9. 9. 9 Organism Location and adaptations Sketch/ Diagram
  10. 10. 10 Organism Location and adaptations Sketch/ Diagram
  11. 11. 11 Organism Location and adaptations Sketch/ Diagram
  12. 12. 12 A Belt transect of the sand island lagoon. This is a method of systematic sampling which should demonstrate the distribution of organisms and how it changes as we move down the beach and further into the intertidal zone. Method: Make a measured profile of the shore indicating the low and high tide levels. Lay down the rope to mark the position of your transect on the shore. It should run at right angles to the sea and where possible should avoid big pools. At 5 metre intervals, lay down the quadrat. Mark the position of the quadrat on the profile chart. The quadrat is a sample area. Examine each sample and estimate the abundance of each alga or plant as: 1. A – Abundant – more than 30 % cover 2. C - Common - 5- 30 % cover 3. F- Few Less than 5 % cover 4. O – Occasional – scattered 5. R- Rare/ very few. Record the information on the data collection sheet provided. Animal numbers should be determined by direct counting in bands 5 m long and 0.5 m wide all along the length of the transect. On completion of your observations, present your results on a graph paper.
  13. 13. 13 Transect across sand island lagoon Record for plants A C F O R and actual numbers for animals. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 Angiosperms Green algae Brown algae Red algae Echinoderms Molluscs Crustacea Fish
  14. 14. 14 Graph
  15. 15. 15 Rotational activities Star fish garden visit. Take notes and use the notes and the materials in the text book to write an essay on the star fish. The essay should include, the different species, nutrition, reproduction (life cycle) and locomotion.
  16. 16. 16 Snorkelling Examine the coral heads and associated plants and animals by completing the snorkelling transit. This transit gives you the opportunity to study the biodiversity of a small part of a coral reef. Write up a short summary of the biodiversity of organisms within the corals in this transit.
  17. 17. 17 K. IMMUNITY - This is the protection of the body against pathogens provided by the body’s defence system - The cells involved in the immune system originate form the stem cells in the bone marrow There are 2 groups:- (i) Phagocytes (ii) Lymphocytes Phagocytes - Produced by the bone marrow and distributed around the body in the blood. - They engulf pathogens by a process called phagocytosis Neutrophills - These are a kind of phagocyte which are short lived and have a lobed nucleus - They can squeeze through capillary walls into an infected area - They are smaller than macrophages Monocytes (Macrophages) - Also phagocytes but are long-lived cells with a circular nuclei - Produced in the bone marrow and migrate to organs such as the lungs, spleen, kidney and lymph nodes where they remove foreign matter from these organs. - They leave the bone marrow and travel in blood as monocytes which later develop into macrophages
  18. 18. 18 Phagocytes recognize, attach to, engulf and digest pathogens that enter the body. This is the response by lymphocytes to the introduction of an antigen in the body Lymphocytes T- Lymphocytes (T-cells) Produced in the bone marrow and migrate to the thymus gland where they mature Mature T cells express specific antigen receptors called T cell receptors Only mature lymphocytes can carry out immune – responses
  19. 19. 19 B- Lymphocytes B-Cells are produced in the bone marrow where they develop and mature and are released directly into the blood stream. Fighting infections (An immune response) During an infection, many B and T cells with specific receptors to the invading antigens are activated - The selected B and T cells divide by mitosis. Some of the daughter B cells develop into plasma cells and others into memory cells. - T cells produce cytokines which stimulate the B cells to divide by mitosis and differentiate to produce plasma cells. - Plasma cell secrete antibodies that specifically combine with the antigens that has entered the body - If antigens enter the body for a second time, the memory cells produced earlier respond and divide to form more plasma cells which secrete antibodies. - The secondary response is much faster than the primary response because of many memory cells in the body These are very important in secondary infection. Since they have specific receptors to the antigens, they quickly divide by mitosis producing many plasma cells which secrete large numbers of antibodies making the secondary response much faster and vigorous. Antibodies Are all globular glycoproteins made up of 4 polypeptide chains; 2 light chains and 2 heavy chains . They have a constant region and a variable region. The variable region is where an antigen fits.
  20. 20. 20 Function of Antibodies - Prevent entry of bacteria, viruses or toxins - Immobilize bacteria by attaching to its flagella - Agglutinate bacteria by sticking them together in clumps - Together with complement proteins make membrane channels allowing water to enter bacteria by osmosis - They label bacteria and viral infected cells for phagocytosis - Neutralize toxins making them harmless Active and passive immunity Active immunity (a) Natural active immunity – This is an immunity initiated when a pathogen invades the body, causing lymphocytes to be activated against its antigens. (b) Artificial active immunity: This is an immunity initiated by injecting antigens into the body i.e. vaccination Passive immunity (a) Artificial passive immunity: - This is the introduction of antitoxins (antibodies) into a person to give protection against infection before B and T cells are produced in sufficient quantities. (b) Natural passive immunity: Immunity passed over from mother to child during pregnancy through the placenta or through breast feeding. Vaccination - This is the introduction of vaccine into the body to stimulate the lymphocytes against infections. Problems with vaccines
  21. 21. 21 Poor response – Different immune system which cannot develop B or T lymphocytes Malnutrition, especially of proteins and so don’t produce antibodies Antigenic variation Some organisms have different strains making it impossible to develop vaccines against them Antigenic concealment Some pathogens evade attack by the immune system by living in cells Eradication of small pox Reasons for success in eradication of small pox - The variola virus was stable (didn’t mutate or change its antigens) - The vaccine was made from a live harmless strain of a similar virus - Vaccine was freeze – dried and so could be kept at high temp for long periods of time. - Infected people were easily identified - Vaccine was easy to administer and more effective after the use of stainless steel needles - The virus didn’t linger in the body after an infection and then become active later - The virus didn’t infect other animals, making it easier to break its transmission cycle - Many people were unmobilised to be vaccinators.
  22. 22. 22 L. ECOLOGY Definitions Habitat – This is the place where an organism lives e.g. the habitat of an oak tree is the woodland. Niche – The role or function of an organism in its environment e.g. the niche of the oak tree is to produce food for other organisms, to remove carbon dioxide from air and replace it with oxygen etc Population – A group of organisms of the same species which live in the same place at the same time and can interbreed to produce fertile offspring e.g. all the oak trees in the woodland make a population Community – All organisms of all the different species living in a habitat e.g. the woodland community. Ecosystem – An environment consisting of living organisms whose interactions with their environment results in a stable, self-sustaining community.
  23. 23. 23 Energy flow in food chains and webs Tropic levels – Theses are specific feeding levels in a food chain. The term tropic means feeding or nutrition Producers – Organisms which convert light energy into chemical energy (plants) Primary consumers – Organisms that feed on procedures (herbivores) Secondary consumers – Organisms, which feed on herbivores. (Carnivores) Tertiary consumers Quaternary consumers Decomposers – they form the end of a food chain and include bacteria and fungi which breakdown dead organisms. Energy losses along food chains In every link energy is lost somehow From sun to producers, energy is lost in the following ways:- 1. Some light is reflected from leaves 2. Some fall on the ground 3. Some fall on non-photosynthetic surfaces 4. Some are not suitable wavelengths 5. Some light passes through the leaves without being trapped by chlorophyll Losses from plants to Pri. Consumers Not all parts are eaten Not all eaten parts are digestible Energy losses as heat within the consumers digestive system Some energy is used by plants for respiration Energy is lost in the same way from consumer to consumer.
  24. 24. 24 Nitrogen cycle Stage of the cycle Nitrogen fixation This is changing of nitrogen gas into nitrates so it can be available to plants 1. Nitrogen fixing bacteria – live free in soil or in root nodules. Convert nitrogen into nitrates 2. Lightning – light energy causes nitrogen to combine with oxygen forming nitrogen oxides, which are reduced to nitrates in the soil 3. Haber process – This is the industrial process of combining nitrogen to hydrogen to form nitrogenous fertilizers. Ammonification This is the decomposition of nitrogenous compounds in dead plants and animal tissues by fungi and bacteria forming ammonia.  Nitrification This is the conversion of ammonia into nitrites then nitrates by nitrifying bacteria. Denitrification This is the conversion of nitrates into nitrogen gas and oxygen by denitrifying bacteria Ecology Glossary 1. Ecosystem: interactions between the biotic (living) organisms and the abiotic (non- living) materials and how materials and energy are transferred. a) biotic – living or dead organisms; made up of cells. (examples: plants, animals) b) abiotic – non-living materials; basic unit is elements also includes energy. (examples: plastic, oxygen, water, rocks, light, heat) 2. Producers: turn the sun’s light energy into chemical (food) energy. They make their own food by the process called Photosynthesis. Only find Producers on the first trophic level. (examples: plants, algae, bacteria) 3. Consumers: can not make their own food (chemical energy) They use the chemical energy from other living organisms. Consumers need to eat Producers or Consumers to get their food energy. Consumers are found on the second or higher trophic levels. a) Primary Consumer – first consuming organism in a food chain. SECOND TROPHIC LEVEL (examples: herbivores or omnivores)
  25. 25. 25 b) Secondary Consumer: second consuming organism in a food chain. THIRD TROPHIC LEVEL (examples: carnivores or omnivores) c) Tertiary Consumer: third consuming organism in a food chain. FOURTH TROPHIC LEVEL (examples: carnivores or omnivores) 4. Trophic Level: feeding level 5. Types of Animal Consumers: a) Herbivores: only eat PRODUCERS (such as plants) b) Carnivores: eat CONSUMERS (herbivores or carnivore or omnivores) c) Omnivores: eat PRODUCERS or CONSUMERS 6. a) Food Chain: starts with a producer and only connects with single links (arrows) to the consumers. example: a typical food chain in a field ecosystem might be: grass ---> grasshopper --> mouse ---> snake ---> hawk b) Food Web: multiple (many) food chains that interconnect showing many feeding relationships. 7 a) Scavengers – feed on the bodies of larger dead animals. (examples: vultures, eagles, ravens, hyenas, some ants, and beetles) b) Detrivores – feed on bodies of smaller dead animals and plants and dung. (examples: crabs, earthworms, wood beetles, carpenter ants · Decomposers: feed on any remaining dead plant and animal matter; they break down the cells and get the last remaining energy. (examples: bacteria, fungi) 8. Population – organisms that belong to the same species that live in the same ecosystem. (ex: people-species in Halifax-ecosystem) 9. Carrying Capacity - largest population of a species that an ecosystem can support. a) Competition: demand for resources (ex: food, water, mates, space) · Intraspecific Competition: competition within a species. (example: wolves vs. wolves) · Interspecific Competition: competition between species. (example: wolves vs. coyotes) b) Population Density: the number of organisms within a given space. · Denisty dependent factors: have a greater effect limiting population size when population number increases; especially play a role when the carrying capacity is reached (example: food supply, predation, competition, disease)
  26. 26. 26 · Density independent factors: limit population size no matter the size of the population (whether 10 or 1000 organisms) (example: climate, oxygen level, natural disasters like hurricane, tornado, forest fire, earthquakes, floods) 10) Biological Magnification - the process whereby substances for example poisons collect in the bodies of organisms and progressively higher concentrations towards the top of the food chain example: DDT Biological Magnification Activity in class: Each blade of grass gets DDT when they take in water. DDT gets stroed in the plants along with stored energy. The grass gets eaten by the rabbits but rabbits eat many blades of grass and get all the DDT present. Now the fox eats many rabbits and the DDT from each rabbit goes to the fox. Therefore, the fox has more DDT than any organism below it on the Food Web. 11) Nutrients - chemical elements used by organisms to build and operate their bodies. example: carbon (C), oxygen (O), hydrogen (H), nitrogen (N) 12) Nutrient Cycles - movement of nutrients through the environment. example: Carbon cycle; nitrogen cycle 13) Closed system - an environment in which substances do not enter or leave example: Earth if often referred to as a closed system 14) Photosynthesis - the change of light energy to chemical energy (sugars) by producers. Chemical Equation: H2O + CO2 (in presence of Light) ---> C6H12O6 + O2 REACTANTS PRODUCTS 15) Cellular Respiration - the change of chemical energy (sugars) into energy that is used by organisms such activities as metabolism (maintaining body temperature, repairing cells, growth); reproduction and movement. Chemical Equation: C6H12O6 + O2 -----> ENERGY + H2O + CO2 REACTANTS PRODUCTS 16) Nitrogen Fixation - the changing of nitrogen gas (N2) in the atmosphere into ammonium (NH4 + ); nitrogen fixation is done by bacteria that live in the soil or on the roots of legumes. 17) Nitrification - the changing of ammonium (NH4 + ) in the soil into nitrates (NO3 -1 ); nitrification is done by bacteria that live in the soil. 18) Denitrification - the changing of nitrates (NO3 -1 ) into nitrogen gas (N2) that returns to the atmosphere; denitrification is done by bacteria that live in the soil. 19) Eutrophication - a water system that has been enriched by nutrients (in particular nitrates) needed by plants; often nutrients from sewage and run-off over-enrich the water system causing an increase in bacterial growth and oxygen depletion that can result in the loss of organisms that live in the water system.
  27. 27. 27 What is Biological Diversity or Biodiversity? Biodiversity or biological diversity is defined by the United Nations Convention on Biological Diversity as: The variability among living organisms from all sources, including, inter alia [among other things], terrestrial, marine and other aquatic ecosystems and the ecological complexes of which they are part: this includes diversity within species, between species and of ecosystems. This convention was ratified by all countries worldwide with the exception of: Andorra, Brunei Darussalam, the Holy See, Iraq, Somalia, Timor-Leste, and the United States of America. Species diversity: diversity among species present in different ecosystems. This is the diversity of populations of organisms and species and the way they interact. Genetic diversity: diversity of genes within a species and processes such as mutations, gene exchanges, and genome dynamics that occur at the DNA level and generate evolution. Ecosystem diversity: genetic, species, and ecosystem diversity of a given region. This is the diversity of species interactions and their immediate environment. Today's biodiversity is the result of billions of years of evolution, natural processes, and in more recent years, human activity. Before the advent of Homo sapiens, the Earth's biodiversity was much greater than it is today. Human activity has had a tremendous impact on biodiversity due to use of Earth's resources and exponential population growth. The total number of species on Earth today is estimated to be around 10 million different species, but could be as low as 2 or as high as 100 million. New species are discovered often, and many that have been discovered have not yet been classified. The richest sources of biodiversity on Earth are found in tropical rainforests and the ocean. Why is biodiversity important? All species are an integral part of their ecosystem by performing specific functions that are often essential to their ecosystems and often to human survival as well. Some of the functions different species provide are to: Capture and store energy Produce organic material Decompose organic material Cycle water and nutrients Control erosion or pests
  28. 28. 28 Help regulate climate and atmospheric gases Ecosystem diversity is important for primary production in terms of: Soil fertility Plant pollination Predator control Waste decomposition Removing species from ecosystems removes those important functions. Therefore, the greater the diversity of an ecosystem the better it can maintain balance and productivity and withstand environmental stressors. Biodiversity is important economically in terms of: Food resources: agriculture, livestock, fish and seafood, Biomedical research: coral reefs are home to thousands of species that may be developed into pharmaceuticals to maintain human health and to treat and cure disease, Industry: textiles, building materials, cosmetics, etc., and Tourism and recreation: Beaches, forests, parks, ecotourism. Biodiversity has an intrinsic value because all species: Provide value beyond their economic, scientific, and ecological contributions, Are part of our cultural and spiritual heritage, Are valuable simply for their beauty and individuality, and Also have a right to life on this planet. We have an ethical responsibility to protect biodiversity. Biodiversity is important to science because it helps us understand how life evolved and continues to evolve. It also provides an understanding on how ecosystems work and how we can help maintain them for our own benefit.
  29. 29. 29 Habitat Conservation Habitat conservation for wild species is one of the most important issues facing the environment today — both in the ocean and on land. As human populations increase, land use increases, and wild species have smaller spaces to call home. More than half of Earth's terrestrial surface has been altered due to human activity, resulting in drastic deforestation, erosion and loss of topsoil, biodiversity loss, and extinction. Species cannot survive outside of their natural habitat without human intervention, such as the habitats found in a zoo or aquarium, for example. Preserving habitats is essential to preserving biodiversity. Migratory species are particularly vulnerable to habitat destruction because they tend to inhabit more than one natural habitat. This creates the need to not only preserve the two habitats for migratory species, but also their migratory route. Altering a natural habitat even slightly can result in a domino effect that harms the entire ecosystem. The following is an example illustrating this point by Dr. Peter Moyle: Habitats don't exist in isolation; most of them have inputs and outputs connected to other habitats and ecosystems. Take Mono Lake, for instance, a spectacular lake on the east side of the Sierra Nevada in California. Its water source is streams fed by winter rains and melting snow in the mountains. In its natural state, water leaves the lake only by evaporation. The balance between the inflowing streams and evaporation created a saline lake with many unique features, including a species of brine shrimp found only in Mono Lake. As a large, food-rich body of water in a desert area, the lake is a major fueling stop for migratory water birds and a major nesting area for other species, such as California gulls. When water from the lake's inflowing streams was diverted to quench the ever- growing thirst of Southern California, the lake level dropped drastically. Islands in the lake became connected to the mainland, giving coyotes and other predators access to an easy source of food: nesting California gulls. With adequate inflowing water, the islands were good nesting habitat; without the water they were unsuitable as nesting habitat. Without adequate inflowing water, the lake also would become too saline for the Mono brine shrimp to survive and for migratory water birds to feed in. Recognition of this fundamental relationship between inflow and habitat for many species was the partial basis of a successful court action that reduced the diversion of water from the inflowing streams. The Problems Habitat destruction is a huge problem in the marine environment. Habitats are destroyed by: Destructive fishing activity: bottom trawling and dynamiting coral reefs destroy entire ecosystems. Coastal development: habitats are destroyed when marshes are dredged for real estate development. Soil runoff and erosion result in excess nutrients from
  30. 30. 30 fertilizers and domestic sewage, which then leads to harmful algae blooms that block sunlight and deplete the water of oxygen. It also causes silt to build-up on coral reefs, which blocks sunlight necessary for coral to grow. Pollution: development near coastal waters contaminates the Ocean with toxic substances, such as industrial chemicals, pesticides, and motor oil. Dredging ship channels: Removes accumulated sediment and pollutants, re- suspending them into the water. Dredging can also destroy sea grass beds and other habitats that provide food, shelter, and breeding grounds. The dredged material must be disposed of, and is often dumped into salt marshes, damaging very productive marine habitats in the process. Solutions Marine Protected Areas (MPAs): marine sites such as sanctuaries, fisheries management areas, state conservation areas, and wildlife refuges established to protect habitats, endangered species, and to restore the health of marine ecosystems in areas jeopardized by habitat and species loss. Examples: NOAA National Marine Sanctuaries: USA Marine Reserves: marine sites that provide a higher degree of ecosystem protection by prohibiting fishing, mineral extraction, and other habitat-altering activities. Marine Reserves are far more effective than MPAs, but unfortunately, they are not as common. Example: Marine Reserves in New Zealand Land use and development regulation: An integrated approach to land use and management based on scientific knowledge is needed to protect coastal areas. Policy makers need to be informed on the impact coastal development is having on marine habitats through accessible and evidence-based information. Monitoring and reporting: some conservation efforts are empowering the citizens with the responsibility for monitoring water quality in their coastal communities through sampling and testing, photographing fouled areas, and providing information to local policy makers for action. Zoning: related to integrated land use and development management, zoning coastal areas into MPAs, Marine Reserves, approved fishing areas, with varying levels of use has the potential to slow some of the habitat degradation caused by development. The Great Barrier Reef is managed in this way. Through cooperation among local, state, and national governments, this approach may provide a viable solution to all stakeholders from tourists, to the fishing industry, to conservation efforts, etc. Although habitat destruction has been increasing for many years, the protection of marine habitats has only recently become an issue of critical importance to conservation efforts, local and national governments, and international marine conservation groups. The Ocean's invulnerability to human activity is now being realized as a myth. Coastal regions are still experiencing intense pressure by exploding coastal populations; however, there are solutions at hand to prevent further damage from occurring.