Seasonal, lunar and tidal control of ichthyoplankton  dynamics at the interface between a temperate estuary  and adjacent coastal waters (western Portugal)

Ana Lígia Primo; Ulisses Miranda Azeiteiro; Sónia Cotrim Marques; Pedro Ré; Miguel Ângelo Pardal

doi:10.3989/scimar.03415.18A

Autores/as

Ana Lígia Primo CFE – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra
Ulisses Miranda Azeiteiro CFE – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra - Departamento de Ciências e Tecnologia, Universidade Aberta
Sónia Cotrim Marques CFE – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra
Pedro Ré Centro de Oceanografia/Laboratório Marítimo da Guia. Faculdade de Ciências da Universidade de Lisboa
Miguel Ângelo Pardal CFE – Centre for Functional Ecology, Department of Life Sciences, University of Coimbra

DOI:

https://doi.org/10.3989/scimar.03415.18A

Palabras clave:

ictioplancton, ingreso larval, intercambio mareal, estacionalidad, ciclo lunar, transporte larval

Resumen

Se estudió la influencia de la estación, ciclo lunar y mareas entre el estuario del Mondego y las aguas costeras adyacentes sobre el ictioplancton y el transporte de las larvas hasta el estuario. En cada estación del año, el ictioplancton fue muestreado en una estación fija situada en la desembocadura del estuario, realizandose ciclos diarios en mareas muertas y vivas. Además, fueron muestreadas otras cuatro estaciones en el estuario. Pomatoschistus spp. fue la principal especie estuarina mientras que Sardina pilchardus y Parablennius pilicornis fueron las especies marinas más importantes. La entrada de ictioplancton y transporte a lo largo del estuario presentaron un patrón estacional con mayores abundancias en verano. El ciclo lunar tuvo una importante influencia en la estructuración de las comunidades que llegan al estuario y su posterior distribución. Solea senegalensis y Sardina pilchardus parecen tomar ventaja de las mareas vivas para entrar en el estuario. S. pilchardus parece aprovechar las mareas para moverse hacia la parte alta del estuario. La entrada del ictioplancton en el estuario parece estar relacionada con el periodo de desove mientras que su distribución en el estuario depende del desove in situ así como de la capacidad de las especies de contrarrestar las corrientes y el caudal del río. Este estudio proporciona un mejor entendimiento de la dinámica del ictio- plancton en la interfaz de dos sistemas costeros y refuerza el conocimiento de la influencia del ciclo lunar de la marea en las comunidades ictioplanctónicas.

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