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17 Cards in this Set
- Front
- Back
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Population Sizes
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Individuals>Populations>Communities>Ecosystem
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Population
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Group of interbreeding individuals of same type that live in particular area.
Important to denote time & space. |
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Demographic Variables
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Mortality(M); Natality(N); Immigration(I); Emigration(E).
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Mortality
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Death rate.
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Natality
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Birth rate.
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Generation time
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Time between birth and when they can reproduce.
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Immigration
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Moving into a population.
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Emigration
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Moving out of a population.
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Rate of Population
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Change in number of individuals in pop divided by amount of time.
(Popfinal - Popinitial)/Time |
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Rate of Change Factors
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Depends on pop size, pop characteristics, and amount of resources available.
Small pop with short generation time and many resources should increase quickly. |
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Calculating changes in pop size
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Popfinal = Popinitial + (N+I) – (M+E)
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Fluctuation
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Pops tend to fluctuate through time.
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Environmental Factors
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Abiotic & Biotic.
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Abiotic
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Nonliving factors: space, light, temperature, rainfall, wind.
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Biotic
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Living factors: predation, competition, parasitism, disease.
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Limiting factor
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Any abiotic or biotic factor that can limit pop size.
At any given time one factor limits a pop. |
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Carrying capacity (K)
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Greatest number of individuals that a space can support indefinitely without degrading environment.
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