Plasticidad fenotípica en una microescala geográfica: el mejillín, Perumytilus purpuratus, que habita en las marismas rocosas de la Patagonia

Autores/as

DOI:

https://doi.org/10.3989/scimar.05040.16A

Palabras clave:

mejillín, ecomorfo, morfometría geométrica, variaciones morfológicas, intermareales rocosos, Patagonia

Resumen


Poder comprender la plasticidad fenotípica de las especies, a diferentes escalas espaciales, es fundamental en un contexto de crecientes cambios ambientales. A través de este conocimiento, es posible predecir su potencial para adaptarse y/o evolucionar frente a nuevas condiciones ambientales tales como el cambio climático, y/o entender el modo en el que se expanden o expandieron sus rangos ecológicos. En las marismas rocosas patagónicas, una de las especies de invertebrados marinos más abundantes es el mejillín Perumytilus purpuratus. En este sistema, se lo encuentra en parches vegetados y sin vegetación que difieren en condiciones ambientales críticas. Mediante un estudio a campo, evaluamos si los mejillines que crecen en parches vegetados difieren en la forma de la concha de aquéllos que crecen en parches adyacentes sin vegetación. Para ello, se colectaron individuos de ambos tipos de parches y se evaluó la forma y el tamaño de las valvas utilizando morfometría geométrica. Los resultados mostraron que los mejillines de parches con vegetación presentan conchas más expandidas dorsoventralmente, con restricción anterodorsal, generando una forma globosa en comparación con la de los individuos de parches sin vegetación. Las distintas formas encontradas podrían deberse a las diferentes condiciones de temperatura, desecación, acción de las olas y densidad poblacional a las que están expuestos los mejillines en cada tipo de parche. Estos resultados muestran la presencia de plasticidad fenotípica en la forma de las valvas de esta especie nativa a una microescala espacial, lo que explicaría el éxito de esta especie en su expansión hacia nuevos ambientes.

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Publicado

2020-12-11

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Gonzalez Giorgis Y, Cruz Sueiro M, Márquez F. Plasticidad fenotípica en una microescala geográfica: el mejillín, Perumytilus purpuratus, que habita en las marismas rocosas de la Patagonia. Sci. mar. [Internet]. 11 de diciembre de 2020 [citado 30 de julio de 2026];84(4):393-401. Disponible en: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1878

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