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APESCH6
| Term | Definition |
|---|---|
| biotic potential | max reproductive rate of an organism, given unlimited resources and ideal environmental conditions |
| exponential growth | growth at a constant rate of increase per unit of time; can be expressed as a constant fraction or exponent |
| carrying capacity | max number of individuals of any species that can be supported by a particular ecosystem on a long term basis |
| population crash | a sudden population decline caused by predation, waste accumulation, or resource depletion; also called a dieback |
| logistic growth | growth rates regulated by internal and external factors that establish an equilibrium with environmental resources |
| density dependent factors | factors affecting population growth that change as population changes |
| density-independent factors | factors affecting population growth that do not change as population changes |
| r-selected species | have rapid reproduction and high offspring mortality. They frequently overshoot carrying capacity of their environment and display boom and bust cycles. lack intrinsic population controls and tend to occupy lower trophic levels in food webs |
| k-selected species | species that reproduce more slowly, occupy higher trophic levels, have fewer offspring, longer life-spans, and greater intrinsic control of population growth than r-selected species |
| biotic factors | caused by living organisms |
| abiotic factors | caused by nonliving components of the environment |
| stress-related diseases | diseases caused or accentuated by social stresses such as crowding |
| island biogeography | study of rates of colonization and extinction of species on islands or other isolated areas based on size, shape, and distance from other inhabited regions |
| genetic drift | gradual changes in gene frequencies in a population due to random events |
| founder effect/demographic bottleneck | effect on a population founded when just a few members of a species survive a catastrophic event or colonize new habitat geographically isolated from other members of the same species |
| minimum viable population size | number of individuals needed for long-term survival of rare and endangered species |
| metapopulation | a collection of populations that have regular or intermittent gene flow between geographically separate units |
Created by:
AlanaR
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