BIOLOGY 1M03 Lecture Notes - Lecture 28: Whooping Crane, Exponential Growth, Carrying Capacity
6 May 2019
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Document Summary
Real world situations: actual growth is often interrupted by catastrophic reductions in population sizes (not density dependent) If conditions remain constant (r does not change over time), the population experiences exponential growth: very high r has a bigger curve on a graph, whereas very low r is almost straight. Real world limits to growth: density dependent factors, examples: Increased predation rate (predators tracking prey increase: density dependent factors reduce growth rates. Sigmoidal-shaped growth curves are a result of density dependence: growth rate slows at high density, carrying capacity, the maximum population size that a particular environment can sustain. Important to not use generic "r", which can be measured at any stage in a population"s growth. Stable population structure, where the proportion of females in each age class is the same: = R0/g: where g equals the generation time (the average time between an individual"s birth and its first offspring"s birth) R0 = net reproductive rate of the population.
