. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 218 G. POHLE AND M. TELFORD 18 LU 14 O Q- 12 QC < 10 O z 8 LLJ £• CO b 4 O. » 34 567 PREMOLT CARAPACE WIDTH (mm) FIGURE 5. Carapace growth of Dissodactylus primitivus males and females as a percent increment based on premolt width. Symbols as in Figure 3. numbers: Males: P-INCR = + (r = , N == 256) Females: P-INCR = + (r = , N == 248) Semi-log regression resulted in lower r2 values ( and , respectively). Growth rate The relationship between carapace width (CW)
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 218 G. POHLE AND M. TELFORD 18 LU 14 O Q- 12 QC < 10 O z 8 LLJ £• CO b 4 O. » 34 567 PREMOLT CARAPACE WIDTH (mm) FIGURE 5. Carapace growth of Dissodactylus primitivus males and females as a percent increment based on premolt width. Symbols as in Figure 3. numbers: Males: P-INCR = + (r = , N == 256) Females: P-INCR = + (r = , N == 248) Semi-log regression resulted in lower r2 values ( and , respectively). Growth rate The relationship between carapace width (CW) and age (days after hatch) is shown in Figure 6. For both sexes the data best fit a power function. Males: log CW == • log AGE - (r2 = , N == 268) and log AGE == CW + Females: log CW == -log AGE - (r = , N = 260) and log AGE == • log CW + Slopes of male and female regressions were significantly different (F = , P = ). This seems to be primarily explained by the decreased carapace growth of older males. This is in agreement with observations that D. primitivus adult males are smaller than females in the wild. Growth in carapace width of individual females which passed through pubertal molts showed no significant de- parture from the curve (square symbols, Fig. 6). Thus, in contrast to abdominal width, carapace width and intermolt period does not seem to change abruptly at the onset of sexual Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Marine Biological Laboratory (Woods Hole, Mass. ); Marine Biological Laboratory (Woods Hole, Mass. ). Annual report 1907/08-1952; Lillie, Frank Rattray, 1870-1947; Moore, Carl Richard, 1892-; Redfield, Alfred Clarence, 1890-1983. Woods Hole, Mass. : Marine Biological Laboratory
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