Revista de Biología Tropical ISSN Impreso: 0034-7744 ISSN electrónico: 2215-2075

OAI: https://revistas.ucr.ac.cr/index.php/rbt/oai
Sexual proportion and hermaphroditism of the mollusc, Anadara tuberculosa (Bivalvia: Arcidae) in Panama

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Keywords

black cockles
Gulf of Chiriquí
mangroves
protandry
concha negra
Golfo de Chiriquí
manglares
protandría

How to Cite

Robles P., Y. A., Vega, A. J., & Diaz, L. del C. (2022). Sexual proportion and hermaphroditism of the mollusc, Anadara tuberculousa (Bivalvia: Arcidae) in Panama. Revista De Biología Tropical, 70(1). https://doi.org/10.15517/rev.biol.trop.v70i1.50805

Abstract

Introduction: The bivalve Anadara tuberculosa is an important fishery in the Eastern Tropical Pacific. The sex ratio varies along its geographic range and there are cases of hermaphroditism, occasional in some populations, normal in others. These characteristics may be a response to anthropogenic and environmental pressure. Objective: To evaluate sex ratio and hermaphroditism of the species in the Panamanian Pacific. Methods: Data on reproductive features of A. tuberculosa generated between 1994 and 2020 for Gulf of Montijo, as well as 2017 data from mangroves of David was analyzed. Macroscopic diagnosis of individual sex is sensitive to the problem of indeterminate individuals, which in turn can skew the sex ratio analysis; therefore, the macroscopic method was compared with histological sections to generate a correction factor to adjust the macroscopically determined sex ratio. Results: For Montijo, histology indicated that the female to male sex ratio ranged from 1:1 to 3.2:1 between 1994 and 2017, while macroscopy indicated 1.9:1 to 5.1:1 between 2004 and 2020. For David, histology indicated a ratio of 3.7:1, and macroscopy 7.9:1. At both localities, larger specimens had more sex ratio variation, independently of the technique, and there was non-casual protandric hermaphroditism in 2017. Conclusion: The occurrence of protandric hermaphroditism and sex ratio changes suggest anthropogenic and environmental pressure in all populations.

https://doi.org/10.15517/rev.biol.trop..v70i1.50805

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