A field experiment on the reproductive success of the invasive clam <i>Mya arenaria</i> (Bivalvia) in the Tagus estuary: coexistence with the native clam <i>Scrobicularia plana</i>

Anxo Conde; Júlio M. Novais; Jorge Domínguez

doi:10.3989/scimar.2011.75n2301

Autores/as

Anxo Conde IBB-Institute for Biotechnology and Bioengineering, Center for Biological and Chemical Engineering, Instituto Superior Técnico (IST) - Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo
Júlio M. Novais IBB-Institute for Biotechnology and Bioengineering, Center for Biological and Chemical Engineering, Instituto Superior Técnico (IST)
Jorge Domínguez Departamento de Ecoloxía e Bioloxía Animal, Universidade de Vigo

DOI:

https://doi.org/10.3989/scimar.2011.75n2301

Palabras clave:

Mya arenaria, éxito reproductivo, distribución intermareal, Scrobicularia plana, estuario del Tajo

Resumen

La almeja invasiva Mya arenaria ha alcanzado un nuevo estadio invasivo en el estuario del Río Tajo, de acuerdo con los resultados de un experimento de campo que transcurrió durante 3 meses y en el que fueron considerados los factores categóricos elevación intermareal (superior, intermedia e inferior) y tratamiento (unidades experimentales excavadas y no excavadas). La presencia continua durante el tiempo de estudio de juveniles del menor tamaño observado (2 mm) nos permitió deducir que la almeja invasiva es capaz de reproducirse en el nuevo hábitat. Individuos juveniles de Mya arenaria y Scrobicularia plana evitaron las unidades experimentales excavadas, siendo más abundantes en las unidades de control. Esta observación sugiere que los juveniles de ambas especies evitan activamente sustratos poco adecuados. Los juveniles de Mya arenaria se distribuyeron principalmente en la zona intermareal media. Sin embargo, los juveniles de Scrobicularia plana se concentraron principalmente en la región intermareal superior, lo que sugiere un comportamiento de fijación distinto al observado en la almeja invasiva. A pesar de la distribución divergente entre los juveniles, la probable interacción entre las dos especies es considerada y discutida.

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Citas

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