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ICES Journal of Marine Science: Journal du Conseil 2006 63(5):799-810; doi:10.1016/j.icesjms.2006.03.007
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© 2006 International Council for the Exploration of the Sea

Changes in the mesozooplankton community associated with the hydrography off the northwestern Iberian Peninsula

Leocadio Blanco-Berciala,*, Florentina Álvarez-Marquésa and Jesús A. Cabalb

a Departamento de Organismos y Sistemas (Zoología) Universidad de Oviedo, Calle Catedrático Rodrigo Uría s/n 33071 Oviedo, Spain
b Instituto Español de Oceanografía, Centro Oceanográfico de Gijón Camino del Arbeyal s/n, 33212 Gijón, Spain

*Correspondence to L. Blanco-Bercial: tel: +34 985 10 48 39; fax: +34 985 10 48 68. e-mail: leocadiobb.uo{at}uniovi.es.

Changes in the mesozooplankton community were investigated along the northwestern coast of the Iberian Peninsula during OMEX II cruises in August 1998, under upwelling conditions, and in October 1999, when there was a saline, warm poleward current flowing along the slope. Six stations, located at both the shelf break and in oceanic waters, were sampled for mesozooplankton by day and by night. Samples were grouped in accordance with their species abundance levels, and the resulting groups were compared with salinity, integrated chlorophyll a, and sea surface and average temperatures. The analysis discriminated stations from different cruises into different groups, and detected the influence of hydrographic structures. The abundance of species linked to high concentrations of Chl a and low temperature increased during the upwelling session, whereas species related to warmer water were more abundant during the 1999 cruise. Further, the analysis revealed differences in the mesozooplankton composition between coastal and oceanic sites, which were influenced to different degrees by the upwelling and the poleward current.

Keywords: Iberian Peninsula, mesozooplankton community, poleward current, upwelling

Received 18 August 2005; accepted 10 March 2006.


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