New insights into the early life ecology of  <em>Sardina pilchardus</em> (Walbaum, 1792) in the northern Iberian Atlantic

Sandra Ramos; Pedro Ré; Adriano A. Bordalo

doi:10.3989/scimar.2009.73n3449

Autores/as

Sandra Ramos Laboratory of Hydrobiology, Institute of Biomedical Sciences, University of Porto
Pedro Ré Faculdade de Ciências da Universidade de Lisboa, Laboratório Marítimo da Guia / Centro de Oceanografia
Adriano A. Bordalo Laboratory of Hydrobiology, Institute of Biomedical Sciences, University of Porto

DOI:

https://doi.org/10.3989/scimar.2009.73n3449

Palabras clave:

Sardina pilchardus, estados larvarios, estrategia reproductiva, control ambiental, afloramiento, estuario del río Lima

Resumen

Las sardinas tienden a ser un componente menor del ictioplancton de los estuarios atlánticos ibéricos. Su aparición es rara y restringida, en gran parte, a las desembocaduras de los ríos. Sin embargo, éste no fue el caso del estuario del río Lima (NW Portugal), donde las sardinas fueron la especie marina más abundante del ictioplanton estuarino. Las sardinas fueron recolectadas durante un período de dos años (2002-2004), y su abundancia varió entre 0.5-60.8 larvas/100 m³. La mayoría de dichas larvas todavía presentaban saco vitelino y ojos no pigmentados. Por otra parte, el 80% de las sardinas tenían 1 semana o menos de vida y su longitud total varió entre 2 y 16 mm. Las variaciones estacionales en la aparición de larvas de sardina en el estuario del río Lima se correlacionaron con fluctuaciones temporales de salinidad y de temperatura de la columna de agua. Los elevados caudales del río observados durante el invierno 2002-2003, que precedieron el pico de abundancia del primavera-verano, parecieron actuar como señal para el reclutamiento al estuario. Además, la aparición en el estuario de larvas de sardina también fue controlada por la intensidad del afloramiento de verano, responsable de la disminución de abundancia de larvas de sardina en la costa, lo que dio lugar a bajas capturas en el estuario durante el verano 2002. Además la inusual aparición de larvas de sardina, dentro del estuario del río Lima reveló otra particularidad relacionada con la carencia de sincronía temporal entre la actividad de freza y la aparición de larvas dentro del estuario. Los picos de abundancia de larvas recién eclosionadas (otoño 2002 y período de primavera-verano de 2003) no coincidieron con la época de puesta invernal previamente descrita para la costa norte de la península ibérica. Estos nuevos datos sobre la ecología de los estados iniciales de desarrollo de la sardina se discuten a la luz de las modificaciones de la estrategia reproductiva del stock de sardinas del norte del Atlántico ibérico.

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Biografía del autor/a

Sandra Ramos, Laboratory of Hydrobiology, Institute of Biomedical Sciences, University of Porto

Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Portugal

Adriano A. Bordalo, Laboratory of Hydrobiology, Institute of Biomedical Sciences, University of Porto

Centro Interdisciplinar de Investigação Marinha e Ambiental (CIIMAR), Portugal

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