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image of Journal of Crustacean Biology

ABSTRACT An intertidal population of Claudicuma platense, a cumacean that inhabits the Rio de la Plata bottom, was sampled for 15 months. This species produces 3 generations per yearoverwintering, spring, and summer-instead of 2, as reported for other temperate shallow-water cumaceans. The spring and summer generations develop over a shorter period (about 2 and 3 months, respectively) than the overwintering generation (about 7 months). Lower abundances were observed in late winter (mean minimum abundance = 133 individuals m-2) when the population consisted mainly of adults, the survivors of the overwintering generation, whereas higher abundances occurred in early summer and early autumn (mean maximum abundances = 4,003 and 2,090 individuals m-2, respectively) when the population was composed primarily of mancas and juveniles. Claudicuma platense was also collected in the subtidal zone near the coast, where the temporal pattern of variations in abundance is apparently similar to that of the intertidal zone. Both the size of marsupial females and the fecundity decrease from overwintering, to spring, to summer generations. Each generation exhibits a linear, but different, female size-fecundity relationship. Hence, other factors, besides female size, influence the fecundity of C. platense.


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