. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 R. HERSHLER AND G. M. DAVIS 5 CO 21. FIGURE 9. Computer plotted regressions of length of body whorl (LEW) on length of the last three whorls (L) (mm). A: H. salsa, paratypes; B: H. tottcni. Martha's Vine- yard ; C : H. totteni, Provincetown; D : H. truncata, Salt Pond; E: H. truncata, Stone Harbor; F: H. truncata, paratypes; Towne Pt. highly significant (P = ) for both populations of H. totteni, and H. truncata from Towne Point and Stone Harbor; significant (P = ) for H. truncata from the Salt Pond; not signif
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 212 R. HERSHLER AND G. M. DAVIS 5 CO 21. FIGURE 9. Computer plotted regressions of length of body whorl (LEW) on length of the last three whorls (L) (mm). A: H. salsa, paratypes; B: H. tottcni. Martha's Vine- yard ; C : H. totteni, Provincetown; D : H. truncata, Salt Pond; E: H. truncata, Stone Harbor; F: H. truncata, paratypes; Towne Pt. highly significant (P = ) for both populations of H. totteni, and H. truncata from Towne Point and Stone Harbor; significant (P = ) for H. truncata from the Salt Pond; not significant for H. salsa (P = ) (due to the scatter for only five data points). Each regression is shown in Figure 9. Paratype specimens of H. truncata (Towne Point) and Stone Harbor speci- mens of H. truncata have a significantly greater slope than do the other popula- tions (but not significantly different between themselves). Of the 15 possible cross comparisons for y intercept there were 5 significant differences (P < ). These differences involved the two populations of Hydrobia totteni (Martha's Vine- yard and Provincetown) compared with H. truncata from Stone Harbor and from Towne Point; there was a significant difference between the Salt Pond and Towne Point populations of H. truncata. The scatter of data points for H. salsa coupled with observations on the rate of whorl increase and relative size of the fourth whorl (Fig. 8) indicated that H. salsa was not allometrically different from H. totteni but was larger than H. totteni. Accordingly, the data for H. salsa and the two populations of H. totteni were pooled and compared with the pool of data for these three populations considered to be H. truncata. The two regressions are significantly different (Fig. 10). The y intercepts and slopes are very significantly different (P — ). H. salsa and H. totteni have a more rapid whorl expansion rate than do populations of H. truncata (Figs. 7, 8). The proportionally
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
