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Elements of Ecology 18
Ch 18
6
Biology
Undergraduate 4
05/04/2012

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Term
Null Model
Definition
Assumes that the presence and abundance of the individual species found in a given comminity are solely a result of the independent responses of each individual species to the prevailing physical environment
Term
Keystone Predation
Definition
Where the predator enhances one more inferior competitors by reducing the abundance of the superior competitor
Term
Apparent competition
Definition
Occurs when a single species of predator deeds on two prey species. When the predator is absent each population of the two prey species is regulated by purely intraspecific density-dependent mechanisms
Term
Indirect mutualism
Definition
Indirect interaction is beneficial both species
Term
Bottom Up Control
Definition
Productivity and abundance of populations at any given trophic level are controlled by the productivity and abundance of populations in the trophic level below them
Term
Top-down control
Definition
Occurs when predators populations can control the abundance of prey species
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