Ecological Speciation and the Intertidal Snail Littorina saxatilis
Figure 5
(a) Shape analysis using geometric morphometrics separates the crab and wave ecotypes to varying degrees in the three regions; (b) example shells to illustrate the range of form in these samples (taken from Butlin et al. [7]). The axis represents the centroid size (CS) and the axis the most important axis of shape variation (RW1).
