Term
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Definition
| all organisms (populations) in a given area |
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Term
| properties of a community: |
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Definition
Diversity- species richness (# of species) and abundance (how many organisms of each species)
Prevalent form of vegetation
Stability- how much it resists change and can return to prior conditions |
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Term
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Definition
| feeding relationships amongst species |
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Term
| interspecific competition |
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Definition
| when two different populations compete for limited resources |
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Term
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Definition
| specific role in a community (determined by its use of biotic and abiotic factors |
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Term
| competitive exclusion principle |
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Definition
| two similar species with same niche can't coexist in the same community; one of them will weaken/die |
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Term
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Definition
| an interaction in which one species eats another; predator and prey |
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Term
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Definition
| a change in one species affects the selection of another species, and that in turn affects the selection of the first species |
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Term
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Definition
| Mechanical (quills), chemical (poisons), camoflage, mimicry |
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Term
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Definition
| a harmless, less abundant species mimics (evolves to resemble) a harmful one. Predators avoid both. |
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Term
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Definition
| two harmful species that occupy similar niches mimic each other so that other species are more afraid of them. |
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Term
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Definition
| A predator that ensures diversity by reducing the density of the strongest competitors in a community |
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Term
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Definition
| interaction between two+ species in which one lives in or on the other and at least one is helped by it |
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Term
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Definition
| + -, parasite gets food at expense of the host |
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Term
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Definition
| + 0, one is helped, the other is neither helped nor harmed |
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Term
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Definition
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Term
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Definition
| transition/change in the species compostion of a community |
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Term
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Definition
| when a community arises from a virtually lifeless area with no soil |
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Term
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Definition
| when a disturbance destorys a community but soil is left intact. |
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Term
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Definition
| permanent; most mature/final stage of a community |
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