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Populations of S. watlingi and S. salomani in Gulf of Mexico coastal waters south of Dauphin Island, Alabama were systematically sampled from July 1984 to June 1985. Spiloouma watlingi inhabited protected estuarine water of Pelican Bay, whileS. salomani was only found seaward of the barrier bar-island system that separated Pelican Bay from the Gulf of Mexico. Both species were present throughout the year. Spi/oouma watlingi was most abundant in autumn and winter and had a single winter reproductive peak, but fecundity was low. Abundance and reproductive peaks for S. salomani were not determined because samples were not collected during the winter months and, when collected, too few specimens were obtained. Mature males in both populations were the smallest individuals. Intermediate in size between mature males and females was a non-sexually dimorphic stage. Preparatory and gravid females were the largest individuals and their numbers were at least twice that of males. A protandrous reproductive strategy Is proposed where small mature males metamorphose Into intersex stages which then become females. Cumaceans, a group of infaunal crustaceans inhabiting benthic substrates from estuaries (Vader & Wolff, 1973) to abyssal depths (Jones & Sanders, 1972), are quite diverse in the waters along the Alabama coast of the Gulf of Mexico (Modlin & Dardeau, 1987). A limited amount of ecological information is availbale for some species inhabiting this coastal region. Abundance, distribution and life history data for Cyclaspis varians Caiman 1912, C. pustulata Zimmer 1943, Oxyurostylis smithi Caiman 1912, and Mancocuma alterum Zimmer 1943 (probably a Spi/ocuma sp.) from the Gulf waters off Mississippi were presented by Weaver (1974). Saloman (1981) described the ecology of S. salomani inhabiting the coastal water off northwestern Florida. Modlin and Dardeau (1987) examined seasonal and spatial distributions of 0. smithi, Leucon americanus Zimmer 1943, C. varians, Eudorelfa monodon Caiman 1912 and Almyracuma proximoculi Jones and Bur83 banck 1959 in Mobile Bay, Alabama, and recently Stearns and Dardeau (1990) added to the information known about A. proximoculi. The life history of A. proximoculi was examined in a population inhabiting coastal western Atlantic waters (Duncan, 1983, 1984). Specimens from the coastal waters off Mississippi identified by Weaver (1974) as Mancocuma alterum probably belong to the genus Spilocuma. Weaver's description superficially compares to the descriptions of Omholt and Heard (1979) and Watling (1977). Additionally, the habitats in which Weaver collected his specimens were very similar to those found in Pelican Bay (Fig. 1). A recent survey by Rakocinski et al. (1991) in the habitats Weaver sampled produced only Spilocuma spp. This paper presents information on the seasonal and spatial distribution, population structure, fecundity and life cycle of S. watlingi and S. salomani from coastal Gulf of Mexico waters south of 1 Modlin: Population Structure, Distribution, Life Cycle and Reproductive S Published by The Aquila Digital Community, 1991

northeast gulf science

Population Structure, Distribution, Life Cycle and Reproductive Strategy of Spilocuma watlingi Omholt and Heard, 1979 and S. salomani Watling, 1977 (Cumacea: Bodotriidae) from Coastal Waters of the Gulf of Mexico