Análise comparativa entre a fecundidade de Dilocarcinus pagei Stimpson e Sylviocarcinus australis Magalhães & Turkay (Crustacea, Decapoda, Trichodactylidae) no Pantanal do Rio Paraguai, Porto Murtinho, Mato Grosso do Sul

Comparative analysis of fecundity between Dilocarcinus pagei Stimpson and Sylviocarcinus australis Magalhães & Turkay (Crustacea, Decapoda, Trichodactylidae) in the Pantanal region of Paraguay River, Porto Murtinho, Mato Grosso do Sul

Cynthia de Barros Mansur Nilton José Hebling Sobre os autores

Resumo

The aim of this study was to estimate the fecundity of Dilocarcinus pagei Stimpson, 1861 and Sylviocarcinus australis Magalhães & Turkay, 1996, collected in the Paraguay River, Porto Murtinho County, State of Mato Grosso do Sul, Brazil, between coordinates 21º42,000'S 57º33,649'W and 21º41,449'S 57º33,770'W, in the period of April 1999 to March 2000. After general collection procedures, the specimens were measured and processed in laboratory conditions. The river water crab species hatch like juveniles and, frequently, female specimens were observed carrying eggs in different stages of development, besides juveniles and eggs at the same time. It was apparent in the frequency distributions that D. pagei has a carapace width average greater than S. australis. The number of eggs and juveniles transported varied amongst species and amongst size class. A size superposition was observed between young and adult females for both species. According to the calculated fecundity index, D. pagei presented slightly more elevated values (7.41) than S. australis (6.65). Eggs are spherical and are not adhering to pleopods. Egg size did not varied during development, continuing with 2mm diameters.

Dilocarcinus pagei; Sylviocarcinus australis; fecundity; Trichodactylidae; Pantanal


Dilocarcinus pagei; Sylviocarcinus australis; fecundity; Trichodactylidae; Pantanal

Análise comparativa entre a fecundidade de Dilocarcinus pagei Stimpson e Sylviocarcinus australis Magalhães & Turkay (Crustacea, Decapoda, Trichodactylidae) no Pantanal do Rio Paraguai, Porto Murtinho, Mato Grosso do Sul

Comparative analysis of fecundity between Dilocarcinus pagei Stimpson and Sylviocarcinus australis Magalhães & Turkay (Crustacea, Decapoda, Trichodactylidae) in the Pantanal region of Paraguay River, Porto Murtinho, Mato Grosso do Sul

Cynthia de Barros MansurI; Nilton José HeblingII

IUniversidade Estadual de Mato Grosso do Sul. Rodovia Dourados - Itahun, Km 12, Caixa Postal 351, 79804-970 Dourados, Mato Grosso do Sul, Brasil. E-mail: cynthia@uems.br

IIDepartamento de Zoologia, Instituto de Biociências, Universidade Estadual Paulista. Avenida 24 A, 1515, Bela Vista, 13506-900 Rio Claro, São Paulo, Brasil

ABSTRACT

The aim of this study was to estimate the fecundity of Dilocarcinus pagei Stimpson, 1861 and Sylviocarcinus australis Magalhães & Turkay, 1996, collected in the Paraguay River, Porto Murtinho County, State of Mato Grosso do Sul, Brazil, between coordinates 21º42,000'S 57º33,649'W and 21º41,449'S 57º33,770'W, in the period of April 1999 to March 2000. After general collection procedures, the specimens were measured and processed in laboratory conditions. The river water crab species hatch like juveniles and, frequently, female specimens were observed carrying eggs in different stages of development, besides juveniles and eggs at the same time. It was apparent in the frequency distributions that D. pagei has a carapace width average greater than S. australis. The number of eggs and juveniles transported varied amongst species and amongst size class. A size superposition was observed between young and adult females for both species. According to the calculated fecundity index, D. pagei presented slightly more elevated values (7.41) than S. australis (6.65). Eggs are spherical and are not adhering to pleopods. Egg size did not varied during development, continuing with 2mm diameters.

Key words:Dilocarcinus pagei, Sylviocarcinus australis, fecundity, Trichodactylidae, Pantanal

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AGRADECIMENTOS. Ao Dr. Célio Magalhães, Instituto de Pesquisas da Amazônia, Manaus, pela confirmação da identificação. A Jaime Roberto Somera, desenhista do Departamento de Zoologia, Instituto de Biociências de Rio Claro, UNESP, pela elaboração da figura.

Recebido em 18.V.2001; aceito em 29.VIII.2002.

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Datas de Publicação

  • Publicação nesta coleção
    15 Maio 2009
  • Data do Fascículo
    Set 2002

Histórico

  • Aceito
    29 Ago 2002
  • Recebido
    18 Maio 2001
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