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Phoxocephalid amphipods are cosmopolitan sand-dwelling, shallow-water crus- taceans. Nearshore waters of California, from the intertidal to 40 m depth, contain at least 15 genera and 25 species (Barnard and Drummond, 1978), with abun- dances in California of over 700 individuals/m2 (Oliver et al., 1980). Despite their widespread distribution and abundance, relatively little is known of two important aspects of the natural history of this family, feeding and habitat selection. Based on qualitative observations, phoxocephalids have been consid- ered detritivores (Enequist, 1949; Barnard et al., 1962; Cooper, 1969; Van Blar- icom, 1978; Biernbaum, 1979) and suspension feeders (Word and Mearns, 1979). Only recently has predation been demonstrated (Oliver et al., 1982). Studies of habitat selection have been performed on other species of crustaceans (Croker, 1967; Jones, 1970; Meadows, 1964a, b; Morgan, 1970; Rees, 1975; Sameoto, 1969), but such behavior has not been observed in phoxocephalids. The main objectives of this study are: (1) to present quantitative information on the diets of five co-occurring species of Californian phoxocephalids, and relate these diets to patterns of prey availability, (2) to explore behavioral changes related to different substrate characteristics in the laboratory, and (3) to relate hypotheses about feeding and habitat selection
Journal of Crustacean Biology – Brill
Published: Jan 1, 1984
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