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Seasonal variability of copepod abundance in the Balearic region (Western Mediterranean) as an indicator of basin scale hydrological changes
Authors:Ma Luz Fernández de Puelles  Ángel Lopéz-Urrutia  Ana Morillas  Juan Carlos Molinero
Institution:1.Centro Oceanográfico de Baleares, Instituto Espa?ol de Oceanografía,Palma de Mallorca,Spain;2.Centro Oceanográfico de Gijón, Instituto Espa?ol de Oceanografía,Gijon,Spain;3.Laboratoire d’Océanologie et de Géosciences,Université des Sciences et Technologies de Lille-Lille1,Wimereux,France;4.Marine Ecology/Experimental Ecology,Leibniz-Institut für Meereswissenschaften,Kiel,Germany
Abstract:Spatial and temporal changes of the copepod community have been investigated and related to the environmental variability of the Balearic Sea (Western Mediterranean). The period studied spans from 1994 to 1999 during which we analyzed the abundance and structure copepod variability over a cross-shore transect. Results showed a close link between hydrological changes and the variations of copepod abundance. The synchronous variability of copepods and hydrography indicated the rapid response of this zooplankton group to the inflow of cold and warm water masses coming through the study area. Cluster analysis revealed four main copepod assemblages that distinguished the coastal from the oceanic species and those species with different water masses preference. The copepod assemblage composed of Calanus helgolandicus, Clausocalanus arcuicornis, C. pergens, C. paululus, Calocalanus tenuis and Pleuromamma gracilis was associated with cool salty waters, whereas the assemblage formed by Temora stylifera, C. pavo, C. styliremis, Centropages bradyi and Acartia danae was related to warmer less saline Mediterranean waters. Moreover, it is suggested that changes in sea water temperature and salinity are linked to large-scale changes likely occurring at a basin scale, which is reflected in the Western Mediterranean mesoscale hydrographic changes. Therefore, it is stressed that changes in the Balearic copepod community can be used as potential tracers of the western Mediterranean water masses. Guest editors: S. Souissi & G. A. Boxshall Copepoda in the Mediterranean: Papers from the 9th International Conference on Copepoda, Hammamet, Tunisia
Keywords:Copepods  Hydrography  Interannual-changes  Balearic Sea  Western Mediterranean
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