BILD 3 Lecture Notes - Lecture 17: Complement Factor B, Limiting Factor, Density Dependence
Document Summary
Costs of reproduction: costs of reproduction can influence clutch size, kestrels that have experimentally enlarged clutches one year have reduced survival the next winter, put more eggs = more parents died, took away eggs = less parents died. Population growth: models of growth: geometric and exponential growth, logistic growth, density dependence. Four processes make up population growth: births & deaths : both depend on current population size. Geometric or exponential growth: example 1 of how to predict a population"s growth with. Vii: example 2 of how to predict a population"s growth rate with. Do real populations ever grow exponentially: yes , in some circumstances, colonization of new habitat, recovery after catastrophe, pulse of new nutrients. Introduced species: populations never grow exponentially for long. Geometric or exponential growth: why do we model exponential growth, potential for exponential growth, recognizes the multiplicative nature of population growth, key to theory of natural selection, may occur in phases when resources are temporarily unlimited.
