Scientia Marina, Vol 67, No S2 (2003)

Recent changes in the summer distribution of the Balearic shearwater Puffinus mauretanicus off western France


https://doi.org/10.3989/scimar.2003.67s2143

Pierre Yésou
ONC-Faune Sauvage, Ministère de l’Écologie et du Développement durable, France

Abstract


Surveys carried out in the 1980s showed that 8,000-10,000 Balearic shearwaters regularly gathered in inshore waters of central and northern Biscay, particularly off the coast of Vendée and in the Mor-Braz area, western France. This distribution, apparently linked to particular oceanographical conditions (thermal front), was strikingly overlapping with that of clupeid fish, particularly anchovies. Recent surveys (1999-2000) have shown that the species has become far less numerous in these "traditional" haunts. Conversely, its abundance has increased in the western Channel, some hundreds of kilometres to the North, during the 1990s. Reasons for this northward shift (e.g. changes in prey distribution due to fishing activities or water warming in Biscay) remain hypothetical and further study is needed.

Keywords


Atlantic Ocean; Balearic shearwater; clupeid fisheries; distribution; English Channel; long-term changes; Puffinus mauretanicus; thermal front

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