. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRAB PREDATION ON LIMPETS 593 m a _o CO CD o k. o li. O) CO 0) k. CO Tenacity Slope FIGURE 5. Slopes of shell strength In-ln regressions (SS) versus slopes of foot tenacity In-ln regressions (FT) for all species and sides of shell. Slopes given as exponents in Tables VI and VII. The regression line (reduced major axis) indicates a significant tendency for greater slopes for shell strength to be associated with greater slopes for foot tenacity: SS = + ; n = 19; r = ; P
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. CRAB PREDATION ON LIMPETS 593 m a _o CO CD o k. o li. O) CO 0) k. CO Tenacity Slope FIGURE 5. Slopes of shell strength In-ln regressions (SS) versus slopes of foot tenacity In-ln regressions (FT) for all species and sides of shell. Slopes given as exponents in Tables VI and VII. The regression line (reduced major axis) indicates a significant tendency for greater slopes for shell strength to be associated with greater slopes for foot tenacity: SS = + ; n = 19; r = ; P = See Figure 4 for abbreviations. and side of the shell tested (slopes given in detransformed form as exponents; Tables VI, VII). These two slopes differed significantly in only one of nineteen cases (F. virescens—posterior side; Lowell, 1987). This means that, for the most part, the shell strength and foot tenacity In-ln regressions were essentially parallel. Thus, the ratio of shell strength to foot tenacity remained fairly constant with increasing size. This linkage between shell strength and foot tenacity over a wide range of different slopes is further emphasized by the highly significant correlation between the slopes for shell strength and those for foot tenacity for all species and sides of the shell combined (Fig. 5). The linkage between shell strength and foot tenacity appears to be at least partially due to the degree of allometric increase of marginal thickness with increasing size. For an isometrically growing limpet, marginal thickness should increase as the square root of foot area due to simple geometric considerations. Several exponents in Table X were significantly different than , indicating an allometric change in marginal thickness with increasing foot area. Furthermore, the exponents in Table X (indicat- ing degree of allometry) were highly correlated with the exponents for shell strength as a function of foot area in Table VI (Fig. 6). In oth
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
