IADIZA 20886
INSTITUTO ARGENTINO DE INVESTIGACIONES DE LAS ZONAS ARIDAS
Unidad Ejecutora - UE
artículos
Título:
Reproductive cycle of the southern geoduck clam, Panopea abbreviata (Bivalvia: Hiatellidae), in north Patagonia, ,Argentina.
Autor/es:
VAN DER MOLEN, S,; KROECK, M.; N.F. CIOCCO.
Revista:
INVERT. REPROD. DEVELOP.
Referencias:
Año: 2007 vol. 50 p. 75 - 84
ISSN:
0792-4259
Resumen:
On the basis of histological examination, we present the first description of gametogenesis in P. abbreviata. Six stages of gonad development were identified using morphological and histochemical criteria. P. abbreviatas gonads are diffuse and sex cannot be detected with the naked eye. The analyses of gonad tissues showed that the gametogenic cycle is continuous with no resting period. Ripe individuals of both sexes were found all year round, and spawning season seems to be protracted. The application of histological techniques to individuals collected monthly, revealed a bias in the sex ratio depending on the length. Even when the sex ratio was balanced in large clams, for small individuals, the sex ratio was biased in favour of the males. Although no hermaphroditic individuals were found in our samples, the possibility of protandry should be examined further.
