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Resumen del producto
Romo Piñera, A.K., B.P., Ceballos Vázquez, F.A., García Domínguez & M., Arellano Martínez
(2009).
Unusual high frequency of hermaphroditism in the gonochoric bivalve Megapitaria squalida (Sowerby, 1835) (Veneridae).
Journal of Shellfish Research.
28(4): 785-789.
Unusual high frequency of hermaphroditism in the gonochoric bivalve Megapitaria squalida (Sowerby, 1835) (Veneridae)
Abril Karim Romo Piñera, Bertha Patricia Ceballos Vázquez, Federico Andrés García Domínguez y Marcial Arellano Martínez
Through histological analyses, this investigation reveals an unusual high incidence of hermaphroditism in Megapitaria squalida, a gonochoric species. A total of 684 specimens were sampled at monthly intervals from February 2007 to January 2008 at Bah?´a de La Paz and Bah?´a Magdalena, Baja California Sur, Mexico. Microscopic examination showed that 21.8% of specimens from Bah?´a de La Paz and 23.5% from Bah?´a Magdalena were hermaphroditic; in both areas, hermaphroditism was found throughout the year, although in variable proportions. In general, a significantly higher Lumber of females relative to males (chi-square, P < 0.05) were observed in both areas. Our findings indicate that this unusual incidence of hermaphroditism was likely caused by the low population density resulting from overfishing.
Palabras clave: squalid callista; sex ratio; Megapitaria; chocolata clam; overfishing
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