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ICES Journal of Marine Science: Journal du Conseil 2005 62(7):1436-1443; doi:10.1016/j.icesjms.2005.04.017
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© 2005 International Council for the Exploration of the Sea

The impact of climate change on the fish community structure of the eastern continental shelf of the Bay of Biscay

Jean-Charles Poularda,* and Fabian Blanchardb

a IFREMER, Département Ecologie et Modéles pour l'Halieutique Rue de l'Ile d'Yeu, BP 21105, 44311 Nantes Cedex 3, France
b IFREMER, Département Sciences et Technologies Halieutiques BP 70, 29280 Plouzané Cedex, France

*Correspondence to J-C. Poulard: tel: +33 2 40 37 41 08; fax: +33 2 40 37 40 75. e-mail: jean.charles.poulard{at}ifremer.fr.

Many fish species are at the southern or northern limit of their distribution range in the Bay of Biscay, where large-scale hydroclimatic changes have occurred in recent decades. We attempt here to identify the impact of these changes on the fish community of the eastern continental shelf of the Bay of Biscay. Data collected during 14 autumn groundfish surveys in 1973 and from 1987 to 2002 are used. The study area is between latitudes 48°30'N and 43°30'N while the depth ranges from 15 to 200 m. Annual abundance indices (number of individuals per km2) of 56 fish taxa present on average in at least 5% of the tows are computed. Multivariate analysis is used to detect temporal trends in these species' abundance indices. Assuming that increased water temperature may favour subtropical species and hinder temperate ones, knowledge about the latitudinal distribution range is used to interpret time trends. Results show an increasing abundance trend with time for fish species having a wide distribution range in latitude (mainly subtropical ones), whereas the abundance of temperate and the least widely distributed species decreased steadily.

Keywords: Bay of Biscay, climate change, fish community, groundfish surveys

Received 29 June 2004; accepted 27 April 2005.


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