Abstract
The distribution and habitat preferences of Sesarma cinereum and S. reticulatum were studied in the region of Beaufort, North Carolina, USA. S. cinereum inhabits the supralittoral zones of marshes characterized by high salinities (mean=27.9%) and sandy substrates, while s. reticulatum were found to prefer eulittoral marshes with brackish salinities (mean=16.2%) and silty substrates. Major differences have also been found in the cycling of egg production between these two species. Populations of S. cinereum produce approximately 4 to 6 egg batches in close synchrony with the lunar phase, whereas populations of S. reticulatum produce only from 2 to 3 batches of young per breeding season. It appears that female S. cinereum invest less time in carrying their eggs (approximately 1 lunar month), while female S. reticulartum invest a greater amount of time (eggs carried for approximately 45 days). These and other specific differences in reproductive strategies suggest that populations of S. cinereum are responding to density-independent selective pressures, while populations of S. reticulatum exhibit characteristics of density-dependent selective effects.
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Communicated by M.R. Tripp, Newark
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Seiple, W. Distribution, habitat preferences and breeding periods in the crustaceans Sesarma cinereum and S. reticulatum (Brachyura: Decapoda: Grapsidae). Mar. Biol. 52, 77–86 (1979). https://doi.org/10.1007/BF00386860
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DOI: https://doi.org/10.1007/BF00386860