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Definition
| an isolated collection of individuals of the same species in a defined geographical area in a given time. |
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| number of animals/unit of distance cubed. determined by counting, quadrant sampling, or mark-and-recapture. |
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| The geographical limits; where they are. |
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Definition
way the individuals are spaced
clumped- all together in dense patches, results from unequal distribution of resources. common in nature.
random- uncommon, swept away
uniform- all spread out, most common in animals |
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Definition
| mortality rate, natality rate, immigration, emigration. usually birth rate - death rate and img. and emg. |
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G= rN
the growth rate increases with population size. forever growing. |
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Definition
The pop. growth is checked by carrying capacity (max # an environment can support). As it approaches K, growth slows and evens until birth rate = death rate.
rN(K-N)/K
lag-log-leveling-equilibrium |
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Definition
| limit pop growth. density plays a role: food, water, space. |
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| Random things like weather. Will affect the same % of pop regardless of density. |
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| some animals have growth in cycles, and die out only to have growth again. cause of food and predators or stress from crowding |
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| events in animal's life from birth to death |
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| show survivorship and fecundity by ages |
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opportunistic. Type 3 curve.
Live in unstable habitats, fast pop. growth, "reproduction now," think weeds, insects. Small as adults, mature and reproduce early, produce many offspring. |
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Definition
Equilibrium. Type 1 curve.
Live in stable habitats. Delayed reproduction and adult competitiveness. Large as adults, mature and reproduce late, reproduce repeatedly (not in one bout), produce few offspring with care. |
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