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Ecosystems

8.L.3

TermDefinition
Ecosystem A community of organisms and their abiotic environment
Abiotic non-living parts of an environment
Biotic living parts of the environment
limiting factor An environmental factor that prevents a population from increasing
population group of individuals of the same species that live in the same area
population density The number of individuals in an area of a specific size
community All the different populations that live together in an area
carrying capacity Largest number of individuals of a population that a environment can support
density dependent factors limiting factor that depends on population size
density independent factors limiting factor that affects all populations in similar ways, regardless of population size
Producer An organism that can make its own food. Also called an autotroph
Consumer An organism that obtains energy by feeding on other organisms. Also called a heterotroph
Decomposer An organism that breaks down wastes and dead organisms
Parasitism A relationship between two organisms of different species where one benefits and the other is harmed
Predation An interaction in which one organism kills another for food.
Competition the struggle between organisms to survive in a habitat with limited resources
Symbiosis A relationship in which two different organisms live in close association with each other
Commensalism A relationship between two organisms in which one organism benefits and the other is unaffected
Mutualism A relationship between two species in which both species benefit
Heterotroph organism that obtains energy from the foods it consumes; also called a consumer
Autotroph An organism that makes its own food. Also called a producer
Trophic Level step in a food chain or food web
food chain the simplest path that energy takes through an ecosystem
food web A community of organisms where there are several interrelated food chains
carbon cycle The organic circulation of carbon from the atmosphere into organisms and back again
nitrogen cycle The movement of nitrogen around the biosphere
Created by: KathrynCalderon
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