2009
DOI: 10.2983/035.028.0407
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Unusual High Frequency of Hermaphroditism in the Gonochoric BivalveMegapitaria squalida(Sowerby, 1835) (Veneridae)

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Cited by 12 publications
(8 citation statements)
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“…In the Veneridae, hermaphrodite individuals have been found in two different species, Ruditapes philippinarum (Delgado and Pérez-Camacho 2007, Lee et al 2013), with frequency values similar to our findings (Drummond et al 2006), and Megapitaria squalida (Romo Piñera et al 2009). The high hermaphrodite frequency (between 21.8% and 23.5%) for M. squalida was related to the low population density resulting from overfishing (Romo Piñera et al 2009). The smooth clam population studied here was also affected by overfishing, but the frequency of hermaphrodites was much lower than what reported by Romo Piñera et al (2009) for M. squalida.…”
Section: Discussionsupporting
confidence: 88%
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“…In the Veneridae, hermaphrodite individuals have been found in two different species, Ruditapes philippinarum (Delgado and Pérez-Camacho 2007, Lee et al 2013), with frequency values similar to our findings (Drummond et al 2006), and Megapitaria squalida (Romo Piñera et al 2009). The high hermaphrodite frequency (between 21.8% and 23.5%) for M. squalida was related to the low population density resulting from overfishing (Romo Piñera et al 2009). The smooth clam population studied here was also affected by overfishing, but the frequency of hermaphrodites was much lower than what reported by Romo Piñera et al (2009) for M. squalida.…”
Section: Discussionsupporting
confidence: 88%
“…The high hermaphrodite frequency (between 21.8% and 23.5%) for M. squalida was related to the low population density resulting from overfishing (Romo Piñera et al 2009). The smooth clam population studied here was also affected by overfishing, but the frequency of hermaphrodites was much lower than what reported by Romo Piñera et al (2009) for M. squalida. Therefore, we do not think that overfishing would cause hermaphroditism in C. chione, as hermaphroditic individuals have occasionally been found in bivalve species strictly considered gonochoric.…”
Section: Discussionmentioning
confidence: 99%
“…The explanation for the development of hermaphroditism in gonochoric species is unknown. Romo Piñera et al (2009) proposed that the bivalve Megapitaria squalida responded to the reduction of population size – due to fisheries – by increasing the proportion of hermaphrodite individuals. This phenotypical plasticity would contribute to increasing the reproductive success of individuals at low population densities (Morton, 1991).…”
Section: Discussionmentioning
confidence: 99%
“…El incremento en la proporción de hembras observado en GM y MD coincide con la disminución de las densidades poblacionales en ambas localidades, debido a la presión pesquera a la que ha estado sometido este recurso (Vega et al, 2021), lo cual coincide con lo expuesto por Romo-Piñera et al (2009), en Megapitaria Squalida y Breton et al (2018), en una revisión sobre bivalvos, al plantear que es una estrategia para garantizar la reproducción de la especie. En este sentido, Dalpé et al (2022), reportaron que en organismos sésiles (Crassostrea gigas), el hecho de estar agregados o no, incide sobre el cambio de sexo, y la proporción sexual, resultando que machos solitarios se convirtieron en hembras con más frecuencia que los gregarios (Yasuoka & Yusa, 2016), con lo que se podría interpretar que la disminución de las densidades puede tener un efecto similar.…”
Section: Discussionunclassified