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Ecosystems
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18
Biology
9th Grade
11/13/2012

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Term
herbivore
Definition
An organism that eats only plants
Term
disturbance
Definition
In ecology, an event thatchanges a community by removing or destroying organisms or altering resources availability
Term
biomass
Definition
Any orgainc material that has been produced in an ecosystem
Term
pioneer species
Definition
A species that colonizes an uninhabitated area that starts an acological cycle in which many other species become established
Term
decomposer
Definition
An organism that feeds by breaking down organic matter from dead organisms;examples include bacteria and fungi
Term
ecological succession
Definition
A gradual process of change and replacement in a community
Term
omnivore
Definition
An organism that eats a variety of other organisms, including animals and plants
Term
biodiversity
Definition
The variety of organisms considered at all levels, from populations to ecosystems
Term
food chain
Definition
The pathway of energy transfer through various stages as a result of the feeding patterns of a series of organisms
Term
biological magnification
Definition
The accumalation of increasingly large amounts of toxic substances within each successive link of the food chain
Term
consumer
Definition
An organism that eats other organisms or organic matter instead of producing its own nutrients or obtaining nutrients from inorganic sources
Term
primary succession
Definition
succession that begins in an area that didnt previously support life
Term
trophic level
Definition
Organism's relative position in a sequence of energy transfers in a food chain or a food pyramid
Term
secondary succession
Definition
The process by which one community replaces another community that has been partially or totally destroyed
Term
climate community
Definition
A community that, after a process of ecological succession, has reached a generally stable state
Term
detrivore
Definition
A consumer that feeds on dead organisms or on the parts or wastes of other organisms
Term
food web
Definition
A diagram that shows the feeding relationships amoung organisms in an ecosystem
Term
carnivore
Definition
an organism that eats animals
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