Resumo
The relative growth of the male chelipod and female abdomen of Armases angustipes (Dana, 1852) was studied in order to determine the carapace size of puberty. Also, the age of juvenile crabs in laboratory was established. A total of 537 males and 557 females were analysed and the transition point between mature and immature stages was determined for both sexes. Males attain maturity at 1.00 cm carapace width and females at 1.08 cm. The relative growth of female abdomen was more remarkable than that of the male chelipod, although both are positive allometric. It suggests a greater importance of a large abdomen in females than a strong chelipod in males. Juvenile crabs reared from megalopa stage has five developmental stages before reaching sexual differentiation. This occurs in the sixth juvenile stage, when the intermolt stages become longer. The potential equation between carapace width and accumulated duration of juvenile stages is described as CW = 0,047D0,508.
Armases angustipes; crabs; relative growth; age determination
Armases angustipes; crabs; relative growth; age determination
Crescimento relativo e determinação da idade na fase juvenil de Armases angustipes (Dana) (Decapoda, Brachyura, Grapsidae)1 1 Contribuigao numero 1121 do Departamento deZoologia, Universidade Federal do Paraná.
Relative growth and age determination of juvenile crab ofArmases angustipes (Dana) (Decapoda, Brachyura, Grapsidae)
Vania G.L. KowalczukI; Setuko MasunariII
IDepartamento de Biologia, Universidade Federal de Roraima. Campus do Paricarana, Rodovia BR 174, 69310-270 Boa Vista, Roraima, Brasil
IIDepartamento de Zoologia, Universidade Federal do Paraná. Caixa Postal 19020, 81531-990 Curitiba, Paraná, Brasil
ABSTRACT
The relative growth of the male chelipod and female abdomen of Armases angustipes (Dana, 1852) was studied in order to determine the carapace size of puberty. Also, the age of juvenile crabs in laboratory was established. A total of 537 males and 557 females were analysed and the transition point between mature and immature stages was determined for both sexes. Males attain maturity at 1.00 cm carapace width and females at 1.08 cm. The relative growth of female abdomen was more remarkable than that of the male chelipod, although both are positive allometric. It suggests a greater importance of a large abdomen in females than a strong chelipod in males. Juvenile crabs reared from megalopa stage has five developmental stages before reaching sexual differentiation. This occurs in the sixth juvenile stage, when the intermolt stages become longer. The potential equation between carapace width and accumulated duration of juvenile stages is described as CW = 0,047D0,508.
Key words:Armases angustipes, crabs, relative growth, age determination
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AGRADECIMENTOS. Ao Prof. Dr. Gustavo Augusto Schmidt de Melo, do Museu de Zologia da Universidade de São Paulo, pela identificação da espécie em estudo. Ao Prof. M.Sc. Paulo Pezzuto, da Fundação Universidade do Vale do Itajai (Itajai, Santa Catarina), pela concessão no uso do programa Regrans de sua autoria. Ao Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq), que através do Curso de Pós-Graduação em Ciências Biológicas-Zoologia da Universidade Federal do Paraná concedeu uma bolsa de mestrado à primeira autora para o desenvolvimento do presente trabalho.
Recebido em 04.111.1999; aceito em 17.1.2000.
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Datas de Publicação
-
Publicação nesta coleção
22 Maio 2009 -
Data do Fascículo
Mar 2000
Histórico
-
Recebido
04 Mar 1999 -
Aceito
17 Jan 2000