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Fecundity of <i>Uca uruguayensis</i> and <i>Chasmagnathus granulatus</i> (Decapoda, Brachyura) from the "Refugio de Vida Silvestre" Bahía Samborombón, Argentina

Abstract

The aim of the present work conducted at the Refugio de Vida Silvestre Bahía Samborombón is to analyse the most relevant aspects of the fecundity of Chasmagnathus granulatus and Uca uruguayensis. Samplings were carried out from March 2001 to February 2003. Ovigerous females of U. uruguayensis (N = 13) and C. granulatus (N = 25) were found during spring and summer, their sizes (CW) varied from 9.1 to 11.7 mm for the former species and from 22.8 to 32.4 mm for the latter. The egg diameter in U. uruguayensis ranged from 245 to 260 ?m for embryos in the early stage of development and from 250 to 345 ?m for those in mid-developmental stage, while in C. granulatus from 250 to 345 μm and from 260 to 365 ?m respectively. Fecundity varied from 1126 to 6745 eggs/brood in U. uruguayensis and 15688-57418 eggs/brood in C. granulatus. For those females with broods in mid-developmental stage, several relationships were made. For U. uruguayensis the best correlation coefficients were obtained for the relationships: female weight vs. egg mass weight and carapace width vs. egg mass weight; for C. granulatus the best association was obtained between female size and the egg number and the egg mass weight.O objetivo do presente trabalho foi analisar os aspectos mais relevantes da fecundidade de Chasmagnathus granulatus e Uca uruguayensis no Ref&uacute;gio da Vida Silvestre Bahia Samboromb&oacute;n. As amostragens foram realizadas de mar&ccedil;o de 2001 a fevereiro de 2003. As f&ecirc;meas ov&iacute;geras de U. uruguayensis (N = 13) e de C. granulatus (N = 25) foram capturadas na primavera e ver&atilde;o. A largura da carapa&ccedil;a (LC) de U. uruguayensis variou de 9.1 a 11.7 mm, e de 22.8 a 32.4 mm para C. granulatus. O di&acirc;metro dos ovos de U. uruguayensis variou de 245 a 260 &micro;m para embri&otilde;es em est&aacute;gio de desenvolvimento inicial e de 250 a 345 &micro;m para aqueles em est&aacute;gio intermedi&aacute;rio; para C. granulatus as varia&ccedil;&otilde;es foram de 250 a 345 &micro;m e de 260 a 365 &micro;m, respectivamente. A fecundidade de U. uruguayensis variou de 1126 a 6745 ovos/desova e para C. granulatus de 15688 a 57418 ovos/desova. Para as f&ecirc;meas com massa de ovos em est&aacute;gio de desenvolvimento intermedi&aacute;rio foram efetuadas v&aacute;rias rela&ccedil;&otilde;es: para U. uruguayensis os melhores coeficientes de correla&ccedil;&atilde;o foram obtidos nas rela&ccedil;&otilde;es: peso da f&ecirc;mea vs. peso da massa de ovos, e largura da carapa&ccedil;a vs. peso da massa de ovos. Para C. granulatus, a melhor associa&ccedil;&atilde;o foi obtida entre o n&uacute;mero de ovos e o peso da massa de ovos

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