Journal
ESTUARINE COASTAL AND SHELF SCIENCE
Volume 189, Issue -, Pages 189-202Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2017.03.010
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- EDF
- IFREMER (ECLIPSE)
- Region Hauts-de-France (ECLIPSE)
- Foundation for Research on Biodiversity (ECLIPSE) [astre 2014-10824]
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A growing number of studies have documented increasing dominance of warm-water fish species (tropicalisation) in response to ocean warming. Such reorganization of communities is starting to occur in a multitude of local ecosystems, implying that tropicalisation of marine communities could become a global phenomenon. Using 32 years of trawl surveys in the Bay of Somme (English Channel, France), we aimed to investigate the existence of a tropicalisation in the fish community at the local scale of the estuary during the mid-1990s, a period where an exceptional temperature rise occurred in Northeast Atlantic. A long-term response occurred (with a major transition over 6 years) that was characterized by a marked diminution in the abundance of cold-water species in parallel to a temperature rise generated by the ocean-scale phenomenon, the Atlantic Multidecadal Oscillation, which switched from a cool to a warm phase during the late 1990s. Despite finding no significant increase in the dominance of warm water species, the long-term diminution of cold-water species suggests that the restructuring of the fish community was mainly influenced by global-scale environmental conditions rather than local ones and that indirect effects may also occurred through biological interactions. (C) 2017 Elsevier Ltd. All rights reserved.
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