BIO 262 Lecture Notes - Lecture 13: Logistic Function, Exponential Growth, Carrying Capacity
5 Mar 2019
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Document Summary
Population growth can be represented by an exponential growth curve: Populations grow in proportion to their size. N(t) = number of individuals after t time units. N(0) = initial population size r = exponential growth rate e = base (about 2. 72) Population changes (births, deaths, immigration, emigration) depend. Rate at which population may grow influenced by: on resource availability or other environmental changes. Biotic potential: capacity a population has for growth. Intrinsic rate of increase (r): the rate at which a population would grow if it had unlimited resources. R-selected species have high potential for increase. Example: a single female house fly could give rise to 5 trillion ancestor flies in about 13 months but not realistic situation. Rate at which population may grow influenced by: Environmental resistance: factors that limit the growth of populations biotic and abiotic. Carrying capacity (k): the number of individuals of a species that can be sustained in a given space.
