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17 Cards in this Set

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Population Sizes
Individuals>Populations>Communities>Ecosystem
Population
Group of interbreeding individuals of same type that live in particular area.

Important to denote time & space.
Demographic Variables
Mortality(M); Natality(N); Immigration(I); Emigration(E).
Mortality
Death rate.
Natality
Birth rate.
Generation time
Time between birth and when they can reproduce.
Immigration
Moving into a population.
Emigration
Moving out of a population.
Rate of Population
Change in number of individuals in pop divided by amount of time.

(Popfinal - Popinitial)/Time
Rate of Change Factors
Depends on pop size, pop characteristics, and amount of resources available.

Small pop with short generation time and many resources should increase quickly.
Calculating changes in pop size
Popfinal = Popinitial + (N+I) – (M+E)
Fluctuation
Pops tend to fluctuate through time.
Environmental Factors
Abiotic & Biotic.
Abiotic
Nonliving factors: space, light, temperature, rainfall, wind.
Biotic
Living factors: predation, competition, parasitism, disease.
Limiting factor
Any abiotic or biotic factor that can limit pop size.
At any given time one factor limits a pop.
Carrying capacity (K)
Greatest number of individuals that a space can support indefinitely without degrading environment.