Life History and Structure of the World's Southernmost Uca Population: Uca Uruguayensis (Crustacea, Brachyura) in Mar Chiquita Lagoon (Argentina)
Abstract:Population structure and life history of Uca uruguayensis have been studied for the first time at the southern limit of its geographic range (Mar Chiquita Lagoon, Buenos Aires Province, Argentina). This population lives in homogeneous intertidal muddy habitat and has a bimodal size frequency distribution during most of the year. Crabs are recruited in fall, grow slowly during winter and fast through spring. In the first summer females are ovigerous for the first time (carapace width less than 9 mm). Adults remain alive and reproductively active until the end of the second summer (reaching more than 14 mm carapace width). The lifespan, including larval stages, lasts two years. The adult population averages 65% males; sex ratio increases with size, from 50 to 90% approximately. The proportion of males having the right or left chaela hypertrophied did not differ significantly from an expected 1:1 ratio. Juveniles and small males from 3 to 5 mm carapace width, frequently showed the lost of the right or left chaela, but indistinctly.
Document Type: Research Article
Publication date: 1991-05-01
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