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Biologia populacional de Emerita brasiliensis Schmitt (Crustacea, Hippidae) na Praia Vermelha do Norte, Ubatuba (São Paulo, Brasil)

Population biology of Emerita brasiliensis Schmitt (Crustacea, Hippidae) in Vermelha do Norte beach, Ubatuba (São Paulo, Brazil)

Resumo

Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil) to Buenos Aires Province (Argentina). Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length). Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm), and females from 13.8-26.3mm (20.5±1.8mm), showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00), however in May/1992 an inverse pattern occurred (1.84:1.00). Ovigerous females were present in all samples with exception of May and September/1992 with greater frequencies in July/1992 and January/1993. It is probable that female maturity occurs is reached with 17mm CL, the smallest size in wich ovigerous females were found.

Hippidae; Emerita brasiliensis; population structure; sex-ratio


Hippidae; Emerita brasiliensis; population structure; sex-ratio

Biologia populacional de Emerita brasiliensis Schmitt (Crustacea, Hippidae) na Praia Vermelha do Norte, Ubatuba (São Paulo, Brasil)

Population biology of Emerita brasiliensis Schmitt (Crustacea, Hippidae) in Vermelha do Norte beach, Ubatuba (São Paulo, Brazil)

Jelly Makoto NakagakiI,III; Marcelo Antonio Amaro PinheiroII,III

IUnidade de Jardim, Universidade Estadual de Mato Grosso do Sul. Avenida 11 de dezembro, 79240-000 Jardim, Mato Grosso do Sul, Brasil

IIDepartamento de Biologia Aplicada, FCAVJ, Universidade Estadual Paulista. 14870-000 Jaboticabal, São Paulo, Brasil

IIINúcleo de Estudos em Biologia, Ecologia e Cultivo de Crustáceos (NEBECC)

ABSTRACT

Emerita brasiliensis Schmitt, 1935 is a common mole crab called "tatuíra" in Brazil, with distribution from Espírito-Santo State (Brazil) to Buenos Aires Province (Argentina). Specimens were collected bimonthly from May/1992 through March/1993 with 4mm siffers mesh, in the intertidal region at Vermelha do Norte Beach, Ubatuba, São Paulo, Brazil. The animals were sexed and measured with a precision caliper of 0.1 mm (Cl = carapace length). Males presented cl amplitude from 3.4-17.3mm (13.2±2.1mm), and females from 13.8-26.3mm (20.5±1.8mm), showing a well-defined sexual dimorfism for this variable. The population presented a smaller incidence of males in relation to females (0.54:1.00), however in May/1992 an inverse pattern occurred (1.84:1.00). Ovigerous females were present in all samples with exception of May and September/1992 with greater frequencies in July/1992 and January/1993. It is probable that female maturity occurs is reached with 17mm CL, the smallest size in wich ovigerous females were found.

Key words: Hippidae, Emerita brasiliensis, population structure, sex-ratio.

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Recebido em 22.I.1999; aceito em 16.XI.1999.

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Datas de Publicação

  • Publicação nesta coleção
    04 Jun 2009
  • Data do Fascículo
    1999

Histórico

  • Recebido
    22 Jan 1999
  • Aceito
    16 Nov 1999
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