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Estimating Population Size & Distribution

Biology 6C73 Exercise 3 CEstimating Population Size & DistributionParts of this lab adapted from General Ecology Labs, Dr. Chris Brown, Tennessee Technological University and Ecology onCampus, Dr. Robert Kingsolver, Bellarmine of the goals of Population ecologists is to explain patterns of species Distribution andabundance. In today s lab we will learn some methods for Estimating Population size and fordetermining the Distribution of Abundance: QuadratsOne of the first questions an ecologist asks about a Population is, "How many individuals arehere?" This question is trickier than it appears. First, defining an individual is easier for someorganisms than others. In Canada geese, a "head count" of geese captured on the ground duringtheir summer molt gives a clear indication of adult numbers, but should eggs be counted asmembers of the Population or not?

the mean number of individuals per quadrat. This gives us a reliable way to measure aggregation. Statisticians have demonstrated that the variance/mean ratio, x, yields a value close to 1 in a randomly dispersed population, because in samples from a random distribution the variance is equal to the mean.

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