Martin Wikelski and L

Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86) measured the snout-to-vent (anus) length of Galápagos marine iguanas and observed the percent survival of different-sized animals. Figure 25.2 shows the log snout-vent length (SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females.

Figure 25.2
-Examine the figure above.What type of selection for body size appears to be occurring in these marine iguanas?

A) directional selection
B) stabilizing selection
C) disruptive selection
D) sexual selection

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