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Provedor de dados:  Iheringia, Sér. Zool.
País:  Brazil
Título:  Relative growth and morphological sexual maturity of Chasmagnathus granulatus (Crustacea, Varunidae) from a mangrove area in southeastern Brazilian coast
Autores:  Gregati,Rafael Augusto
Negreiros-Fransozo,Maria Lucia
Data:  2007-09-01
Ano:  2007
Palavras-chave:  Grapsoidea
Semiterrestrial crabs
Morphometric relationships
Allometric growth
Resumo:  The relative growth and morphological sexual maturity of Chasmagnathus granulatus Dana, 1851 are presented for the first time to a mangrove population. The crabs were obtained during low tide periods, in the mangrove of Jabaquara Beach, Paraty, Rio de Janeiro, Brazil. All crabs in intermolt stage were sexed and had their body parts measured as follows: body height (BH), carapace length (CL) and width (CW), major cheliped propodus height (PH) and length (PL) for each sex, gonopod length (GL) and abdomen width (AW) for males and females, respectively. The relative growth was described using the allometric equation y=ax b and the size at onset sexual maturity was achieved using the software Mature I. The size of specimens ranged from 4.1 mm to 39.5 mm CW. The growth pattern was different between sexes in the cheliped relationships; the relationships BH vs. CW evidenced positive allometry for juveniles; PL vs. CW and PH vs. CW positive allometry for most crabs except juvenile females; AW vs. CW and GL vs. CW evidenced positive allometry for juveniles and isometry for adults. The relationships that best indicated the change from the juvenile to the adult phase were PH vs. CW for males and AW vs. CW for females. The size in which 50% of males from this population are mature is at 19.7 mm of CW (F=144.14; p<0.05) and for females it is at 19.2 mm of CW (F=166.54; p<0.05). The sizes obtained in this mangrove population are larger than those from previous studies, that could be attributed to a species plasticity concerning the habitat structure.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Museu de Ciências Naturais
Relação:  10.1590/S0073-47212007000300009
Formato:  text/html
Fonte:  Iheringia. Série Zoologia v.97 n.3 2007
Direitos:  info:eu-repo/semantics/openAccess

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