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image of Journal of Crustacean Biology

ABSTRACT The distribution, abundance, and diet of Crangon franciscorum and C. nigricauda were estimated from 15 monthly samples from the channel and shallows of San Pablo Bay. Crangon franciscorum outnumbered C. nigricauda by an overall ratio of 10:1. The majority of the C. nigricauda (85%) were taken in the high salinity waters of the channel. Most of the C. franciscorum catch (68%) came from the low salinity shallows. This species concentrated only in the channel when reproductive in the winter. Crangon franciscorum and C. nigricauda ate prey in common, although relative abundance of foods in the diet varied between species. Crangon nigricauda concentrated its diet on amphipods, while C. franciscorum partitioned its diet more evenly among several prey. Amphipods, bivalves, and foraminiferans were eaten significantly more often in the food-rich shallows than in the channel. These foods and others varied seasonally in the diet. Ontogenetic shifts in types and sizes of prey taken were observed, with crangonid shrimp remains occurring in large C. franciscorum (≧40 mm). Neomysis spp., abundant in the diets of caridean shrimps of the upper reaches of the estuary, are notably rare in the crangonids of San Pablo Bay. The diets of C. franciscorum and C. nigricauda are heavily influenced by predator size, temperature-salinity preferences, and prey availability.

Affiliations: 1: Thames Science Center, Gallows Lane, New London, Connecticut 06320.


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