The fate of eggs and larvae of three pelagic species, mackerel (Scomber scombrus), horse mackerel (Trachurus trachurus) and sardine (Sardina pilchardus) in relation to prevailing currents in the Bay of Biscay: Could they affect larval survival?

  1. PAULA ALVAREZ 1
  2. MARINA CHIFFLET 1
  1. 1 Foundation AZTI-Tecnalia, Herrera kaia, portualdea z/g. 20110 Pasaia, Gipuzkoa, Basque Country, Spain.
Revista:
Scientia Marina

ISSN: 0214-8358

Ano de publicación: 2012

Volume: 76

Número: 3

Páxinas: 573-586

Tipo: Artigo

DOI: 10.3989/SCIMAR.03298.07H DIALNET GOOGLE SCHOLAR lock_openAcceso aberto editor

Outras publicacións en: Scientia Marina

Resumo

El destino de huevos y larvas de tres especies pelágicas caballa, (Scomber scombrus), jurel (Trachurus trachurus) y sardina (Sardina pilchardus) en relación a las corrientes prevalentes en el área del Golfo de Vizcaya. ¿Podrían afectar a la supervivencia larvaria? – La distribución espacial de los huevos y larvas de tres especies pelágicas, caballa, jurel y sardina en el Golfo de Vizcaya fue estudiada en 1998, 2001 y 2004. Esta distribución espacial fue claramente diferente entre los años estudiados y se ajustan, bastante bien a los diferentes regímenes de circulación. Las larvas de caballa y jurel resultaron más directamente afectadas por estas corrientes prevalentes que las larvas de sardina. Esto se explica porque las sardinas desovan en la plataforma, relativamente alejadas del cantil, donde las velocidades de las corrientes son más altas. Las tasas de supervivencia larvaria de caballa y jurel fueron superiores en 2001, cuando el transporte de larvas offshore era más importante. Para las larvas de sardina, sin embargo, la tasa de mortalidad apenas varió entre años. La abundancia de larvas mayores de 25 días, considerada aquí como un índice de la tasa de supervivencia larvaria, resultó ser un buen indicador del reclutamiento por lo menos para los años estudiados. Nuestros resultados contradicen la teoría de Bakun (1996), que afirma que la dispersión de las etapas de vida temprana hacia las aguas del océano abierto causa una alta mortalidad larvaria. Por lo menos bajo la condición que se observó durante estos años (temperatura y abundancia de alimento), la retención de larvas en mar abierto parece tener un efecto positivo en el crecimiento larvario y/o supervivencia.

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Fonte de datos: Dialnet