General Ecology_Mahaffy_Date__040810

General Ecology_Mahaffy_Date__040810 - Population ecology...

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Population ecology continued Mortality and survival Survivorship curves Plot log survivorship vs. age Gives the percent of cohort surviving at each age Three types Type 1 Species lives for a while and then they die Examples Humans Dolphins Type 2 Equal chance of death at all ages Examples Songbirds Squirrels Type 3 High infant mortality rate If make it to adulthood will live for a long time Example Sea turtles American toads Coral More with life tables Can use life table to predict net reproductive rate If net reproductive rate is > 0 the population is growing If net reproductive rate is <0 the population is decreasing Can also calculate generation time (T) Average age to give birth Rate of population growth increases with a smaller T Younger mothers Two general patterns of population growth J-shaped Exponential Change in population size over time= reproductive rate * population size
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This note was uploaded on 08/29/2010 for the course BISC 302 taught by Professor Walsh during the Spring '08 term at University of Delaware.

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General Ecology_Mahaffy_Date__040810 - Population ecology...

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