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33 Cards in this Set
- Front
- Back
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biotic potential |
potential of pop left to grow w nothing holding it back |
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exponential |
growth rate becomes ever more rapid in proportion to the growing total number or size.
# of indi/change in time= rate of growth*# of indi |
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J curve |
graph of exponential growth |
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carrying capacity |
# of animals/biomass that can be supported in given area |
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population overshoot |
exceeds carrying capacity |
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population crash/dieback |
sudden pop ccrash |
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boom-and-bust cycles |
pop cycles overshoot and then dieback |
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logistic growth |
growth rates regulated by in/external factors that makes equilibrium with resources exponential growth (1-pop/carrying cap) |
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density dependent |
factors affecting pop growth that change as pop size changes |
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r-selected species |
species w rapid reproduce and high infant mortality, boom and bust, occupy lower trophic levels than K-species |
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K-selected species |
reproduce slowly, high trophic, few offspring, longer life spans |
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natality |
production of new individuals throughh birth, cloning, hatching, and is main source of addition to populations |
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fecundity |
physical ability to reproduce |
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fertility |
measure of actual offspring reproduced |
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mortality |
death rate; probability of dying |
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survivorship |
percent of pop reaching max lifespan for species |
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life expectancy |
on average how long a species lives |
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life span |
longest life in species |
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stress-related diseases |
diseases caused by social stress such as crowding |
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island biogeography |
study of colonization and extinction of species on islands or other isolated areas based on size shape and distance from other organisms |
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genetic drift |
gradual change in gene frequencies |
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founder effect/demographic bottleneck |
just a few survive and then repopulate |
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min viable pop size |
# of indi needed for long term survival of rare/endangered species |
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meta-population |
collections of pops that have regular or intermittent gene flow between geographically separate units |
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I=PAT |
Impacts= Pop*Affluence*Technology |
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demography |
study of pops |
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Crude birth rate |
# of births in a yer per 1000 |
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total fertility rate |
# of kids born to avg woman in pop during reproductive life |
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zero pop growth (zpg) |
births+immigration=deaths+emigration |
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crude death rates |
# of death per 1000 per year |
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natural increase |
CBR-CDR |
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total growth rate |
net rate of population growth resulting from im, em, births, deaths |
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youre doing great |
keep going |
