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vol.67 número4Comportamento agonístico e reprodutivo nos machos de híbrido vermelho de tilápia, Oreochromis niloticus (Linnaeus, 1758) x O. mossambicus (Peters, 1852) (Osteichthyes: Cichlidae)Polinização e sistema reprodutivo de Couepia uiti (Chrysobalanaceae, no Pantanal da Nhecolândia) índice de autoresíndice de assuntospesquisa de artigos
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Brazilian Journal of Biology

versão impressa ISSN 1519-6984versão On-line ISSN 1678-4375

Resumo

DE CONTO, V  e  CERQUEIRA, R. Braz. J. Biol. [online]. 2007, vol.67, n.4, pp.707-713. ISSN 1519-6984.  http://dx.doi.org/10.1590/S1519-69842007000400017.

The reproduction, development and growth of Akodon lindberghi were studied in captivity. The colony was derived from animals captured in Simão Pereira, Minas Gerais state, which represents a new area of geographical distribution known for this species. Twelve males and twelve females were crossed, producing 144 young in 53 litters. Post-partum oestrus was observed and gestation length was estimated in 23 days. Litter size ranged from 1 to 4 with a mean of 2.72 (SD = 0.97, n = 53) and modal size of 3. Sexual dimorphism was neither present in body mass at birth nor at weaning. There was a significant negative correlation between litter size and mass at birth or weaning. Permanent emergence of adult external appearance occurred at 15 days. Puberty for males and females was 43 and 42 days, respectively, and the first fecundation event for two females was recorded at 47 and 54 days of age. The weight growth was described by fitting a Gompertz model. No significant difference was found in any parameter of growth curves for males and females. Measurements (head-body, tail, hind foot and internal and external ear lengths) obtained for adult individuals also did not reveal the presence of sexual dimorphism.

Palavras-chave : reproductive biology; life history traits; Gompertz growth curve; longevity; morphometrics.

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