. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLONIZATION OF MANGROVE CRABS 189 CRAB SIZE (carapace width, mm). 120 100 80 60 40 20 MALE CRABS (n = 403) 40 60 80 100 120 FEMALE CRABS (n = 453) Figure 1. The size distributions for 403 male and 453 female man- grove crabs (Scylla serrata) collected from mangrove areas in the im- mediate vicinity of Phuket. Thailand. Some small crabs also harbor octolasmids, , Uca minax, with a carapace width of 38 mm (Williams, 1965) was reported to bear Octolasmis miilleri (Coker, 1902), (Pearse, 1936). In a survey of the decapods o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. COLONIZATION OF MANGROVE CRABS 189 CRAB SIZE (carapace width, mm). 120 100 80 60 40 20 MALE CRABS (n = 403) 40 60 80 100 120 FEMALE CRABS (n = 453) Figure 1. The size distributions for 403 male and 453 female man- grove crabs (Scylla serrata) collected from mangrove areas in the im- mediate vicinity of Phuket. Thailand. Some small crabs also harbor octolasmids, , Uca minax, with a carapace width of 38 mm (Williams, 1965) was reported to bear Octolasmis miilleri (Coker, 1902), (Pearse, 1936). In a survey of the decapods of Sabah, Ma- laysia (unpublished), we noted that three different crab species, all small, harbored Octolasmis angulata in their branchial chambers: 2 male Pilumnits scabriusculus (Adams & White), and mm, respectively; 1 male Pilumnits vespertilio (Fabricius, 1793), mm; and 1 male Actaeodes sp., mm. These observations, to- gether with the observation that smaller S. serrata had few or no octolasmids. prompted us to ask whether host size might be a consideration in the mangrove crab-oc- tolasmid symbiosis. The purpose of this research was to determine the stage and time in the life cycle of the mangrove crab when Octolasmis spp. colonize its gill chambers. Specifically, we sought to identify the youngest crab instars that harbor Octolasmis. and to compare the number and distribution of barnacles on their gills with those on mature crabs. Materials and Methods During 1990 and 1991, S. serrata were collected from shallow seas adjacent to mangroves, mostly within 2 km of the town of Phuket, Thailand, for study at the Phuket Marine Biological Center. The very small instars were caught by hand, whereas larger crabs were caught in baited traps. The crabs were sexed, weighed, and their carapace lengths and widths measured (Heasman, 1980). They were preserved in formalin and stored in 70% ethanol for later examination. The crabs were examined for Octolasmis cyprid
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
