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01 23456789 10 Family size (k)

01 23456789 10 Family size (k)

0123456789 10 Family size (k)

Figure 3.17 Distributions of family size. The variance equals the mean as expected for a Poisson distribution on the left. However, the center distribution has a few families that are very prolific while 75% of the families produce two or fewer progeny with most individuals failing to reproduce. The distribution on the right has less variance in family size than expected for a Poisson distribution with most families of size two. The Poisson distribution is taken as the standard with an effective size of 100. By comparison, the center distribution has a smaller effective population size and the distribution on the right a larger effective population size.

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