Influence of temperature and spawning effort on Haliotis tuberculata mortalities caused by Vibrio harveyi: an example of emerging vibriosis linked to global warming

Global Change Biology - Tập 15 Số 6 - Trang 1365-1376 - 2009
Marie‐Agnès Travers1,2, Olivier Basuyaux3, Nelly Le Goïc1, Sylvain Huchette2, Jean-Louis Nicolas4, Marcel Koken1, Christine Paillard1
1Laboratoire des Sciences de l'Environnement Marin (LEMAR)
2Scea France Haliotis
3Synergie MEr et Littoral
4Laboratoire de Physiologie des Invertébrés

Tóm tắt

AbstractSince 1998, Haliotis tuberculata mass mortalities have been occurring regularly in wild abalone populations in France during their reproductive period and in conjunction with seawater summer temperature maxima and Vibrio harveyi presence. To confirm the importance of bacterial exposure, temperature and reproductive status on abalone susceptibility, experimental infections via bath exposure were performed using abalone ranging from immature to reproductively mature. Ripe abalone were more susceptible to the bacterium than immature specimens (P<0.001), and a difference of only 1 °C in temperature had a highly significant impact on the mortalities (P<0.001). The natural mortalities that were surveyed during summer 2007 confirmed that recent epidemic losses of European abalone appeared in conjunction with host reproductive stress, elevated temperatures and presence of the pathogen V. harveyi. In view of the elevation of the mean summer temperatures observed in Brittany and Normandy over the last 25 years, this temperature‐dependent vibriosis represents a new case of emerging disease associated with global warming.

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