. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -i • r 25 3 SHIELD LENGTH (mm) Figure 1. Relationship between size (shield length) and body (without chelipeds) weight, compared between sexes. A positive correlation was found in both males (r = df = 41, /> <).. 2 24 28 32 SIZE CLASSES (SL, mm) n = 104 i = 100 Figure 2. Size class distributions compared between sexes from summer collections. Data on egg incubation and hatching were obtained from 19 ovigerous females, collected on January 18 (5), February 8 (5), and April 27 (9) 1993. In the labo
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. -i • r 25 3 SHIELD LENGTH (mm) Figure 1. Relationship between size (shield length) and body (without chelipeds) weight, compared between sexes. A positive correlation was found in both males (r = df = 41, /> <).. 2 24 28 32 SIZE CLASSES (SL, mm) n = 104 i = 100 Figure 2. Size class distributions compared between sexes from summer collections. Data on egg incubation and hatching were obtained from 19 ovigerous females, collected on January 18 (5), February 8 (5), and April 27 (9) 1993. In the laboratory, the females were placed in individual glass bowls 20 cm in diameter, in filtered seawater with a salinity of 28- 31 %o. The bowls were kept in a constant temperature unit at 10°C under a light:dark regime of 14:10. Until they released larvae, ovigerous females were checked twice a day for hatching, placed in bowls of clean seawater, and fed Anemia. The number of larvae released daily was re- corded for ten of the females. For statistical analysis, we followed the methods and recommendations of Siegel (1956) and Zar (1984). The level of significance under which the null hypothesis was rejected is a = Results Population struct we Figure 1 shows the relationship between SL and body weight (excluding chelipeds) compared between sexes. No between-sex difference was found in either the slope ( vs. , / = df = 81. ns) or the intercept ( vs. t = , df = 82, ns) of the regression line. The sizes of crabs (SL) during summer were analyzed (Fig. 2). No significant difference in size distributions was found between the two sexes (G = , df = 7, ns). The smallest specimens measured (prepubertal, showing no gonopores), (male), and mm SL (female), and the maximum size attained mm SL in the two sexes. The sex ratio was (104 males to 100 females), which did not differ from 1:1 (X2 = , df = 1, ns). Similarly, the s
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
