Rising water temperatures, reproduction and recruitment of an invasive oyster, Crassostrea gigas, on the French Atlantic coast

Type Article
Date 2010-02
Language English
Author(s) Dutertre Mickael1, Beninger Peter G.1, Barille Laurent1, Papin Mathias2, Haure Joel2
Affiliation(s) 1 : Univ Nantes, Nantes Atlantique Univ, Equipe Mer Mol Sante, EA 2160,Fac Sci & Tech, F-44322 Nantes, France.
2 : IFREMER, Lab Conchylicole Pays Loire, F-85230 Polder Des Champs, Bouin, France.
Source Marine Environmental Research (0141-1136) (Elsevier Sci Ltd), 2010-02 , Vol. 69 , N. 1 , P. 1-9
DOI 10.1016/j.marenvres.2009.07.002
WOS© Times Cited 48
Keyword(s) Aquaculture, Climate warming, Coastal waters, Crassostrea gigas, Reproductive cycle, Oyster larvae, Settlement, Turbidity
Abstract The recent appearance and invasion of feral oysters (Crassostrea gigas) along the northern European Atlantic coast, underscores the necessity to investigate the relationship between environmental variables, reproductive physiology, larval development and recruitment. We studied these relationships at both high (HT) and intermediate (IT) - turbidity sites, through historical data on water temperatures, multi-parameter environmental probes, histological analyses, and field collections of planktonic larvae and settled post-larvae in 2005 and 2006. A progressive warming trend was observed, especially since 1995, when oyster proliferation first became severe. Threshold temperatures for oocyte growth, larval development and settlement were achieved in both 2005 and 2006. The HT site showed greater numbers of larvae and post-larvae than the IT site for both years, with the highest numbers of post-larvae observed at both sites during the warmer summer of 2006. These results suggest that increased temperatures in northern European waters allow successful reproduction, larval development, and recruitment of C gigas. High turbidity conditions further enhance this success. (C) 2009 Elsevier Ltd. All rights reserved.
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