BIOLOGY 1M03 Lecture Notes - Lecture 4: Population Ecology, Life Table, Jeffrey Rowland
17 Oct 2015
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Document Summary
The first law of population ecology change in population size = birth death + immigration emigration rates depend on both age (size) and population density negative density dependence keeps populations in check per capita birth, immigration rates usually decrease with n =population size per capita death, emigration usually increase age dependence per capita fecundity increases, might later decrease with age per capita mortality decreases, might later increase per capita avg rate/individual total rate total birth rate. More interesting survival curves type i/ii/iii are idealizations steep slope=high mortality (juvenile mortality, senescence) depends on environment (historical human patterns are different) R0= x=1 lx mx population grows if r0>1 , shrinks if r0<1 similar idea for epidemics. Life history evolution correlations among traits high fecundity, small offspring, early maturation, short life span low fecundity, large offspring, late maturation, long life span not always that simple: live slow, flower like crazy, die spectacularly? naturesongs. com.
