. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION CHARACTERISTICS OF UCA 219. FIGURE 2. Morphology of the external reproductive structures found in Gulf Celuca. A. Gonopores of female L^ca subcylindrica. Bar = mm, arrows indicate genital tubercle. B. Posterior perspective of right gonopodium from male U. subcylindrica. Bar = mm. C. Gonopores of female Uca spinicarpa. Bar = mm, arrows indicates lateral margins. D. Lateral perspective of right gonopodium from male U. spinicarpa. Bar = mm. Examples taken from individuals with carapace width between 1
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. POPULATION CHARACTERISTICS OF UCA 219. FIGURE 2. Morphology of the external reproductive structures found in Gulf Celuca. A. Gonopores of female L^ca subcylindrica. Bar = mm, arrows indicate genital tubercle. B. Posterior perspective of right gonopodium from male U. subcylindrica. Bar = mm. C. Gonopores of female Uca spinicarpa. Bar = mm, arrows indicates lateral margins. D. Lateral perspective of right gonopodium from male U. spinicarpa. Bar = mm. Examples taken from individuals with carapace width between and females possess broad abdomens. The size intervals between and mm within subpopulation I represent a transitional phase to sexual maturity. This interval appears to represent morphologically but not functionally mature females since egg production is not observed until the crabs are in the 9-10 mm size category (Fig. 4). Based on cheliped asymmetry and abdomen structure, the probability of maleness (Pm) averages ± (58%) over the entire population. In subpopulation I, the prepuberty sample, Pm = 53 ± 3%. This increases to 61 ± 4% in subpopulation II. Pm is calculated for each mm length interval and compared throughout the population in Figure 5. Since the relative number of males increases with size, the sex ratio in the population is considered to be "intermediate" as described by Wenner (1972). A significant correlation coefficient of is seen for the nine categories of carapace length (P < ). The male:female ratio is between and in size classes greater than mm. Since differential migration patterns between the sexes appears to be negligible in this habitat (Thurman, 1984), these data suggest that females either suc- cumb to environmental pressures earlier or grow less rapidly than males after puberty as proposed by Fielding and Haley (1976) for other crabs. However, Colby and Fonseca (1984) have found
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
