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ICES Journal of Marine Science: Journal du Conseil 2003 60(4):753-766; doi:10.1016/S1054-3139(03)00089-4
© 2003 by ICES/CIEM International Council for the Exploration of the Sea/Conseil International pour l'Exploration de la Mer
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Demersal assemblages and depth distribution of elasmobranchs from the continental shelf and slope off the Balearic Islands (western Mediterranean)

Enric Massutía,* and Joan Morantab,1

a IEO, Centre Oceanogràfic de les Balears, Moll de Ponent s/n PO Box 291, 07080 Palma de Mallorca, Spain
b CSIC-UIB, Institut Mediterrani d'Estudis Avançats Miquel Marquès 21, 07190 Esporles, Spain

*Correspondence to E. Massutí; tel: +34 971401561; fax: +34 971404945. e-mail: enric.massuti{at}ba.ieo.es; joan.moranta{at}uib.es.

The analysis of 131 hauls from four bottom trawl fishing surveys carried out between depths of 46 and 1713 m in two different areas off the Balearic Islands yielded a total of 23 elasmobranch species belonging to eight families. Cluster analysis and multidimensional scaling (MDS) ordination were applied to detect zonation patterns and some ecological parameters (e.g. species richness, abundance and biomass, mean weight, diversity and evenness) were calculated for each assemblage. For each area, analysis of similitude (ANOSIM) and similarity percentage analysis (SIMPER) were also applied to detect differences between seasons and depths. For the most important species (Galeus melastomus, Scyliorhinus canicula, Centroscymnus coelolepis, Etmopterus spinax, Squalus blainvillei, Raja naevus, Raja asterias, Raja clavata, Raja miraletus and Raja oxyrhinchus), abundance and size distributions were analysed by depth.

Keywords: Balearic Islands, bathymetric distribution, community structure, demersal elasmobranchs, length frequency, trawl surveys, western Mediterranean

Received 8 October 2002; accepted 31 March 2003.

1 Tel: +34 971611722; fax: +34 971611761.


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