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Relative growth of Acantholobulus schmitti (Rathbun, 1930) (Crustacea, Brachyura, Panopeidae) at Guaratuba Bay, southern Brazil.
Frigotto, S F; Marochi, M Z; Masunari, S.
Afiliação
  • Frigotto SF; Postgraduate Program on Zoology, Department of Zoology, Federal University of Paraná, Curitiba, Paraná, Brazil.
  • Marochi MZ; Postgraduate Program on Zoology, Department of Zoology, Federal University of Paraná, Curitiba, Paraná, Brazil.
  • Masunari S; Postgraduate Program on Zoology, Department of Zoology, Federal University of Paraná, Curitiba, Paraná, Brazil.
Braz J Biol ; 73(4): 863-70, 2013 Nov.
Article em En | MEDLINE | ID: mdl-24789404
A study on the relative growth of the crab Acantholobulus schmitti (Rathbun, 1930) (Decapoda, Brachyura, Panopeidae) was performed with allometric techniques. The species is associated with lanterns used for oyster farming at Guaratuba Bay, southern Brazil. Crabs were obtained from five lanterns from March through December 2009. The following morphological characteristics were measured: the carapace width (CW), the height and length of the major cheliped propodus (LPH and LPL), the width of the female abdomen at the base of the 4th somite (AW) and the length of the male gonopod (GL). A total of 1,004 individuals of A. schmitti were measured, of which 451 were males, 323 non-ovigerous females and 230 ovigerous females. The CW of the males varied from 1.87 to 11.86 mm, that of non-ovigerous females from 1.44 to 8.77 mm and that of ovigerous females from 4.09 to 11.12 mm. The plot of LPH against CW showed a mean inflection point at 3.67 mm CW for the males. This result indicated that male crabs are juvenile below this value and adult above it. For the females, the corresponding inflection point occurred at 3.36 mm CW in the plot of AW against CW. These results, CW x LPH and CW x AW, highlight the importance of chelae enlargement at the onset of maturation in males. Similarly, the widening of the abdomen in females is required to accommodate egg clutches during the reproductive period. Heterochely was recorded in both sexes. Right-handed crabs were more frequent than left-handed ones, with percentages of 75.8% in males and 82.7% in females. The population of A. schmitti from Guaratuba Bay becomes sexually mature at an earlier age than A. schmitti from the coast of São Paulo state. The lanterns used in oyster farming furnish a safe habitat in which these crabs can spend their entire benthic life.
Assuntos

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Braquiúros Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Braz J Biol Assunto da revista: BIOLOGIA Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Braquiúros Limite: Animals País/Região como assunto: America do sul / Brasil Idioma: En Revista: Braz J Biol Assunto da revista: BIOLOGIA Ano de publicação: 2013 Tipo de documento: Article País de afiliação: Brasil País de publicação: Brasil