Bioecologia de duas espécies do gênero Hexapanopeus (Crustacea, Decapoda, Xanthoidea) na região de Ubatuba, litoral norte do Estado de São Paulo
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Data
2006-02-24
Autores
Fumis, Patricia Bianca [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
O tamanho no qual os braquiúros atingem a maturidade sexual é fundamental para o conhecimento da biologia reprodutiva das espécies. O objetivo deste trabalho foi determinar o crescimento relativo e a maturidade sexual morfológica do caranguejo xantídeo Hexapanopeus paulensis, por meio do método alométrico e verificar a ocorrência de heteroquelia em ambos os sexos. As coletas foram realizadas mensalmente por dois anos (1998-1999) na região de Ubatuba, litoral norte do Estado de São Paulo. Todos os caranguejos foram classificados quanto ao sexo e mensurados quanto à largura da carapaça (LC), comprimento da carapaça (CC), largura do abdome (LA) da base do 5º somito, comprimento (CPQ) e altura (APQ) do própodo dos quelípodos direito e esquerdo, e comprimento do gonopódio (CG) dos machos. O crescimento relativo da espécies foi descrito a partir da equação alométrica y=axb e o programa Mature I foi utilizado para estimar o tamanho da maturidade. O tamanho dos caranguejos, baseado na LC, variou de 3,0 a 17,4mm para machos e 2,9 a 14,0mm para fêmeas. A análise da relação CL vs. CW evidenciou alometria negativa para machos jovens e fêmeas jovens e adultas, e isometria para machos adultos. A relação CPQ vs. LC e APQ vs. LC indicaram alometria positiva para machos e fêmeas. Para relação CG vs LC, machos exibiram alometria positiva na fase juvenil e negativa na fase adulta. Para fêmeas a relação LA vs. LC indicou alometria positiva em ambas as fases. Em quase todas as regressões, o padrão de crescimento exibidos por jovens e adultos diferiu estatisticamente (p<0,05), exceto para CPQ e APQ para fêmeas (p>0,05). As relações que melhor indicaram a mudança da fase juvenil para adulta foram CG vs. LC para machos e LA vs. LC para fêmeas. O tamanho no qual 50% dos machos na população encontram-se maduros foi...
The size in which brachyurans reach the sexual maturity is essential to the knowledge of species reproductive biology. The aim of this work was to determine the relative growth and morphological sexual maturity of the xanthid crab Hexapanopeus paulensis by means of the allometric technique and to verify the occurrence of heterochely in each sexes. Samples were taken monthly for 2 years (1998-1999) in the Ubatuba region on the northern coast of São Paulo State. All crabs were sexed and measured to obtain their carapace width (CW) and length (CL), abdomen width (AW) at the base of the 5th somite, right and left cheliped propodus length (PL) and height (PH). Males were also measured at their gonopod length (GL). The relative growth was described using the allometric equation y=axb and the software Mature I was used to estime the size of maturity. The size of crabs basead on CW ranged from 3.0 to 17.4mm for males and 2.9 to 14.0mm for females. The scatterplots of the relationship CL vs. CW indicated negative allometry for young males, young and adult females and isomety for the adult males. The relationships PL vs. CW and PH vs. CW indicated positive allometry to females and all males. For relationships GL vs CW, males showed positive allometry in the young phase and negative in adults. For females the relathionship AW vs. CW indicate positive allometry in both phases. In almost all regressions, the growth pattern of the juvenile and adult phases had statistical diference (p<0.05), except for PL and PH for females (p>0.05). The relationships that best indicated the change from the juvenile to adult phase were GL vs. CW for males and AW vs. CW for females. The size in which 50% of males from this population are mature was about 7.8mm of CW (F=52.17, p<0.05) and females about 6.5mm of CW (F=178.16, p<0.05). The maturity found by... (Complete abstract click electronic access below)
The size in which brachyurans reach the sexual maturity is essential to the knowledge of species reproductive biology. The aim of this work was to determine the relative growth and morphological sexual maturity of the xanthid crab Hexapanopeus paulensis by means of the allometric technique and to verify the occurrence of heterochely in each sexes. Samples were taken monthly for 2 years (1998-1999) in the Ubatuba region on the northern coast of São Paulo State. All crabs were sexed and measured to obtain their carapace width (CW) and length (CL), abdomen width (AW) at the base of the 5th somite, right and left cheliped propodus length (PL) and height (PH). Males were also measured at their gonopod length (GL). The relative growth was described using the allometric equation y=axb and the software Mature I was used to estime the size of maturity. The size of crabs basead on CW ranged from 3.0 to 17.4mm for males and 2.9 to 14.0mm for females. The scatterplots of the relationship CL vs. CW indicated negative allometry for young males, young and adult females and isomety for the adult males. The relationships PL vs. CW and PH vs. CW indicated positive allometry to females and all males. For relationships GL vs CW, males showed positive allometry in the young phase and negative in adults. For females the relathionship AW vs. CW indicate positive allometry in both phases. In almost all regressions, the growth pattern of the juvenile and adult phases had statistical diference (p<0.05), except for PL and PH for females (p>0.05). The relationships that best indicated the change from the juvenile to adult phase were GL vs. CW for males and AW vs. CW for females. The size in which 50% of males from this population are mature was about 7.8mm of CW (F=52.17, p<0.05) and females about 6.5mm of CW (F=178.16, p<0.05). The maturity found by... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Zoologia, Decapode (Crustaceo), Caranguejo - Maturidade sexual, Hexapanopeus paulensis
Como citar
FUMIS, Patricia Bianca. Bioecologia de duas espécies do gênero Hexapanopeus (Crustacea, Decapoda, Xanthoidea) na região de Ubatuba, litoral norte do Estado de São Paulo. 2006. 92 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências de Botucatu, 2006.