. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 468 T. J. HILBISH AND F. J. VERNBERG - -S, - o •p § E LU I - § e> UJ ^ 5 a - - *** *** I 2 3 4 MOLT I 5 FIGURE 4. Relative daily growth rates in width for Eiirypanopens depressus for each intermolt inter- val. Growth rates are reported in mm/mm/day. Each symbol indicates the mean growth rate for each of the six families used in the analysis. Significant variation among families is indicated along the abcissa with an asterisk (*P < , **P < , ***P < )
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 468 T. J. HILBISH AND F. J. VERNBERG - -S, - o •p § E LU I - § e> UJ ^ 5 a - - *** *** I 2 3 4 MOLT I 5 FIGURE 4. Relative daily growth rates in width for Eiirypanopens depressus for each intermolt inter- val. Growth rates are reported in mm/mm/day. Each symbol indicates the mean growth rate for each of the six families used in the analysis. Significant variation among families is indicated along the abcissa with an asterisk (*P < , **P < , ***P < ). This resulted in a major change in shape over the first few juvenile molts. After meta- morphosis to the first crab stage the carapace of Eurypanopens depressus is approxi- mately square, with an average width to length ratio of (Fig. 6). During the second molt the ratio of width to length increased to The ratio increased to during the third molt. During molts 4, 5, and 6 there was a gradual but continual increase in the width to length ratio up to an average of (Fig. 6). By the sixth molt the crabs had adopted the trapezoidal shape characteristic of adult Ewypanopeus. The analysis of shape was designed to test two questions: do families vary in shape and where in ontogeny is this source of variance of greatest importance? Carpace width was regressed against length for each family, and ANCOVA was used to deter- mine if there was significant variation in shape among families at each molt. Signifi- cant variation in adjusted means indicates that some families are consistently broader or narrower than others. Significant variation among slopes of these regressions indi- cates that the manner in which width scales onto length depends upon family. There- fore, either variation in adjusted means or slopes would be indicative of shape varia- tion among families. Variation in adjusted means was not significant for any of the six molts (Fig. 6; Table II). With
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
