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Figure 1 | BMC Evolutionary Biology

Figure 1

From: Selection for altruism through random drift in variable size populations

Figure 1

Variable carrying capacity.

(a): A community where the carrying capacity is an increasing function of altruist number, varying from N i when the population is composed only of selfish individuals to N f (N f > N i ) when only altruists are present. (b) Two examples of random walks describing the stochastic behavior a such a system (transition probabilities 4–7), where m,n are the number of selfish and altruistic individuals. Red line: loss of S’s; Blue line: loss of A. A Moran process in this scheme corresponds to a random walk constrained to remain on an anti-diagonal line.

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