Figure 6
From: Evolutionary variation in the mechanics of fiddler crab claws
The evolutionary relationship between claw force and armoring. Symbols indicate the force required to cause cuticle indentation of the major claw plotted against the closing force of the major claw. All values are phylogenetically independent contrasts of weight-normalized species averages. Linear fits of standardized contrasts are constrained to pass through the origin and there is a significant positive relationship (r = 0.57, F=8.97, d.f.=19, p<0.05) suggesting that crabs with forceful claws also tend to be heavily armored, even when taking into account size and phylogenetic relatedness.