INVESTIGADORES
VAN DER MOLEN Silvina
artículos
Título:
Reproductive cycle of the southern geoduck clam, Panopea abbreviata (Bivalvia: Hiatellidae), in north Patagonia, Argentina.
Autor/es:
VAN DER MOLEN, SILVINA; KROECK, MARINA; CIOCCO, NÉSTOR
Revista:
INVERT. REPROD. DEVELOP.
Editorial:
Balaban Publishers International Science Services
Referencias:
Lugar: Rehovot; 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
Panopea abbreviata. Six stages of gonad development were identified using morphological and
histochemical criteria. The gonads are diffuse and cannot be sexed 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 for most of the year, and the 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 body 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.
Six stages of gonad development were identified using morphological and
histochemical criteria. The gonads are diffuse and cannot be sexed 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 for most of the year, and the 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 body 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.