. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. (a) Deviation of breaking force from that expected for a given claw size (manus length), and (b) the computed ultimate stress (crh; meganewtons per meter squared. MN m"2) at which the cuticle failed, both as a function of standardized position along the upper margin of the pollex between the insertion point of the closer apodeme (landmark d) and the tip (landmark e) for six species of Cancer crabs, (c) The pollex. or fixed finger, of a C. productus claw illustrating how standardized position was deter- mined;
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 2. (a) Deviation of breaking force from that expected for a given claw size (manus length), and (b) the computed ultimate stress (crh; meganewtons per meter squared. MN m"2) at which the cuticle failed, both as a function of standardized position along the upper margin of the pollex between the insertion point of the closer apodeme (landmark d) and the tip (landmark e) for six species of Cancer crabs, (c) The pollex. or fixed finger, of a C. productus claw illustrating how standardized position was deter- mined; claws of other Cancer species differ in shape and number of teeth (Nations, 1975). The darker portion of the finger is often black in life, and both harder and stronger (Melnick ct 1996). Points surrounded by circles above standardized pollex length indicate claws for which the fracture plane did not deviate by more than 30° from the load vector (see methods). The solid line in (b) indicates a least-squares linear regression through all the data, whereas the dashed line applies only to claws for which the fracture plane did not deviate by more than 30° from the load vector (see Table IIa7,8 for regression statistics). analyzed separately because of the smaller size ranges for the other species. However, a 1-factor ANCOVA with spe- cies as the grouping variable revealed that slopes did not differ significantly among pecies (P = ; see Table Vb) and that the common slope was highly significant (P < ) (Table IIb-7). To control for possible effects of crack location (Fig. 2b), an ANCOVA was also conducted on residuals from the regression of Table IIa-7. This too re- vealed no significant difference in slopes among species (P = ; see Table Vb). The common slope from AN- COVA was also highly significant statistically (P < ) and did not differ significantly from the slope obtained for the original untransformed data (P = ; compare row b-8 to b-7
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
