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image of Crustaceana

Relative growth characteristics for length and weight of A. margaritacea were calculated for a sample of 1,129 specimens collected along the coast of the southern Mexican Pacific. The relations between total length and weight of the females are determined by W = 8.9393 × 10­6TL3.2497 for the dry season and by W = 1.4523 × 10­5TL3.1349 for the rainy season; for males W = 6.3547 × 10­6TL3.3570 for the dry season and W = 6.4332 × 10­6TL3.3570 for the rainy season. Growth was allometrically positive, except for females during the rainy season in which it was isometric. Regressions between total length and cephalothorax length for females read as: log CL = ­ 0.4697 + 1.0176 log TL during the dry season, and log CL = ­ 0.5527 + 1.0629 log TL for the rainy season. In males, this relation was in both seasons log CL = ­ 0.509 + 1.0633 log TL. Relative growth between these body parts was allometric in males, resulting in a marked sexual dimorphism. Females grew less during the rainy season but males showed similar growth throughout the year.

Les caractéristiques de croissance relative pour la longueur et le poids d'Atya margaritacea ont été calculées pour une échantillon de 1.129 spécimens recueillis le long de la côte méridionale pacifique du Mexique. Les relations entre la longueur totale (TL) et le poids (W) des femelles ont été déterminés par W = 8,9393 × 10­6TL3,2497 pour la saison sèche et W = 1,4523 × 10­5TL3,1349pour la saison des pluies; pour les mâles W = 6,3547 × 10­6TL3,3570 pour la saison sèche et W = 6,4332 × 10­6TL3,3570 pour la saison des pluies. La croissance présentait une allométrie positive, excepté pour les femelles dans la saison des pluies, ou elle était isométrique. Les régressions entre la longueur totale et la longueur du céphalothorax pour les femelles étaient lues comme log CL = ­ 0,4697 + 1,0176 log TL pendant la saison sèche et log CL = ­ 0,5527 + 1,0629 log TL pendant la saison des pluies. Chez les mâles, cette relation était, dans les deux saisons: log CL = ­ 0,509 + 1,0633 log TL. La croissance relative entre ces régions du corps était allométrique chez les mâles, d'ou résultait un dimorphisme sexuel marqué. La croissance des femelles tendait à être plus lente pendant la saison des pluies, mais les mâles montraient un accroissement similaire tout au long de l'année.

Affiliations: 1: Instituto de Ciencias del Mar y Limnologí, Universidad nacional Autónoma de México (UNAM), Apartado Postal 70-305, Mexico, D.F. 04510, Mexico; 2: Laboratorio de Ecología, Campus Iztacala, UNAM, Aprtado Postal 314, Av. de los Barrios S/N, Los Reyes Iztacala, Tlalnepantla, Edo. de México, Mexico


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