Larval fish assemblages in coastal waters of central Greece: reflections of topographic and oceanographic heterogeneity

Stylianos Somarakis; Stamatina Isari; Athanassios Machias

doi:10.3989/scimar.2011.75n3605

Autores/as

Stylianos Somarakis Hellenic Centre for Marine Research
Stamatina Isari Hellenic Centre for Marine Research
Athanassios Machias Hellenic Centre for Marine Research

DOI:

https://doi.org/10.3989/scimar.2011.75n3605

Palabras clave:

larva de pez, agrupaciones, distribución espacial, mar Egeo, mar Jónico, Mediterráneo oriental

Resumen

Se analizaron los patrones de distribución de mesoescala de larvas de peces en aguas costeras de Grecia central (un área de alta complejidad topográfica y batimétrica) mediante el estudio de muestras recogidas en el transcurso de dos muestreos de ictioplancton (julio de 1998 y junio de 1999). En la zona este del área de estudio (mar Egeo), las salinidades fueron menores debido a la influencia de aguas procedentes del mar Negro. En esta región, las larvas de muchas especies epipelágicas y bentopelágicas (normalmente de desove en verano) fueron menos abundantes en junio de 1999, cuando las aguas eran significativamente más frías, en comparación con julio de 1998. Un análisis multivariante identificó los grupos ‘nerítico’ y ‘pelágico’ en las estaciones dominadas por larvas de especies epipelágicas/betopelágicas (típicas de plataforma) y mesopelágicas. En el oeste (mar Jónico) se definió un tercer grupo de estaciones con altas abundancias de larvas de peces mesopelágicos ubicadas en el Golfo Korinthiakós, zona muy profunda y cerrada. Sin embargo, los géneros Cyclothone y Vinciguerria, que dominaban en la comunidad de aguas abiertas del Mar Jónico, estaban ausentes en este golfo. Dentro del área de estudio, los golfos de Korinthiakós ( > 900 m de profundidad) y el del Norte de Evoikos ( > 400 m) comprenden ecosistemas únicos en el Mediterráneo, semejantes a fiordos, con una productividad elevada y aguas profundas significativamente más frías que las de cuencas adyacentes del mar abierto.

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Citas

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