BIOL-UA 12 Lecture Notes - Lecture 27: Survivorship Curve, Logistic Function, Exponential Growth
18 Mar 2016
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Document Summary
Population: a group of individuals of a single species that occupy the same general area. Population ecology: how abiotic and biotic factors influence population density, distribution, size and age structure. Population dynamics: the interactions between biotic and abiotic that cause variation in population sizes. Populations increase by birth & immigration. Populations decrease by death & emigration. Density: the number of individuals of a species per unit area or volume. (1) count individuals within quadrats or linear transects. (2) mark-release-recapture for mobile organisms: mark-release-recapture. In a certain amount of time, return and capture more individuals, counting the number of recaptured (marked) individuals. Estimated population size = n= sn x. S = total number of individuals in the first sample and marked. N = total number of individuals in second sample. X = number of marked individuals recaptured. Marked and unmarked individuals have the same probability of being captured or sampled. Marked organisms have mixed completely back into the population.
