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Ecology

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Question
Answer
Ecosystem   All the interactions and relationships of organisms with one another and with their physical environment within a certain area.  
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Omnivore   a consumer that eats both plants and animals  
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Pyramid of Energy   A pyramid shaped diagram of energy flow in a food chain.  
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Carbon Cycle   the movement of carbon atoms through an ecosystem between living organisms as well as the nonliving parts.  
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Predator   The organism that does the killing for food.  
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Scavenger   a carnivore that feeds on the bodies of dead organisms  
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Biosphere   the part of the Earth where all living things are  
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Decomposer   Organisms such as fungi and bacteria that break down the complex chemical compounds made by living things into simple nutrients that are used by food producers.  
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Herbivore   consumer that eats only plants  
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Producer   organisms, such as plants and algae, which through the process of photosynthesis create energy rich sugar.  
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Water Cycle   the continuous process by which water moves from Earth's surface to the atmosphere and back  
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Carnivore   a consumer that eats only animals  
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Consumer   an organism that obtains energy by feeding on other organisms  
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Abiotic factors   nonliving factors in an environment such as rocks, soil, water, and air  
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Biotic factors   living factors in an environment such as plants and animals  
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Limiting Factor   an environmental factor that causes a population to decrease  
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Carrying Capacity   largest population that an area can support  
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Space   often determines the amount of food and water or light that the organism needs  
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Weather   involves temperature and rainfall  
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Direct Observation   trying to count all the objects present  
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Indirect Observation   looking for evidence of the organisms  
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Sampling   Estimating by counting organisms in a small area and then multiplying to find it in a larger area  
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Population   a group of organisms of the same species living in the same ecosystem.  
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Community   living part of the ecosystem.  
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Ecology   the study of the relationships and interactions of living things with one another and their physical environment  
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Mark-and-Recapture   capture in an area, mark in a way that does not hurt them, release them, then count ones without marks  
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Birth Rate   the number of births in a population in a certain amount of time  
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Death Rate   the number of deaths in a population in a certain amount of time  
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Immigration   moving into a population  
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emigration   leaving a population  
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food chain   energy links between different organisms in an ecosystem based on feeding habits  
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food web   interconnected food chains in an ecosystem  
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adaptations   a behavior or physical characteristic that allows an organism to live succsessfully in its environment.  
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tertiary consumer   an organism that eats a secondary consumer  
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commensalism   a relationship between two species in which one species benefits and the other is neither helped nor harmed.  
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competition   the struggle between organisms to survive as they attempt to use the same limited resource  
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habitat   the place in which an organism lives  
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host   the organism that a parasite lives on or in a parasitism interaction  
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mutualism   a relationship between two species in which both species benefit  
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natural selection   a process by which characteristics that make an individual better suited to its environment become more common in a species  
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niche   the special role of an organism in its community or environment  
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nutrient   a simple chemical compound used to nourish living things ;the usable part of food.  
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organism   a living thing  
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parasite   an organism that benefits by living on or in a host in a parasitism interaction  
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parasitism   a relationship in which one organism lives on or in a host and harms it  
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photosynthesis   a chemical reaction in which carbon dioxide and water are combined inside the leaf in the presence of sunlight to form energy rich sugar  
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species   very similar organisms that can produce fertile offspring  
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population density   the number of individuals in a specific area  
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primary consumer   an organism that eats producers  
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secondary consumer   an organism that eats primary consumers  
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prey   an organism that is killed and eaten by another organism  
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symbiosis   a close relationship between species that benefits atleast one of the species  
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primary consumer   an organism that eats producers  
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secondary consumer    
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