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Nutrient and phytoplankton responses to external forcing in a Mediterranean coastal area unbiased by terrestrial inputs and local activities (Calvi, Corsica)
Goffart, Anne; Hecq, Jean-Henri; Legendre, Louis
2013IMBER IMBIZO III, the future of marine biogeochemistry, ecosystems and societies, funded as Eurocean Conference
 

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Keywords :
Phytoplankton; nutrients; Calvi, Corsica; Mediterranean Sea; time-series; external forcing
Abstract :
[en] Despite its relative oligotrophy, the northwestern Mediterranean exhibits rich biodiversity and traditional fishing that are fueled by phytoplankton at the basis of the food web. However, long-term observations of phytoplankton biomass reveal high interannual variability controlled by mechanisms that are still poorly understood, but have implications for the way we study and manage coastal zones in a changing world. Here we present a synthesis of a long-term high-resolution study of nutrient and phytoplankton bloom dynamics performed between 1979 and 2011 at a permanent station in the Bay of Calvi (Corsica, northwestern Mediterranean). The ecosystem of the Bay is known to be very sensitive to climate forcing but preserved from local anthropogenic stressors. As a distinctive feature of the area, the winter-spring phytoplankton bloom of the Bay of Calvi is characterized by a very large interannual variability reaching one order of magnitude from one year to another. In order to understand mechanisms controlling this variability, we defined a winter intensity index (WII) that integrates wind stress intensity and water temperature. WII does not evidence any trend over the 1979-2011 period but is closely correlated to nutrient delivery from deep waters and to phytoplankton production. We synthesize our current understanding of phytoplankton response to the combination of external forcings and discuss the impact of expected environmental changes on the pelagic food web in a region that is predicted to be particularly sensitive to long-term changes driven by human activities.
Research center :
MARE - Centre Interfacultaire de Recherches en Océanologie - ULiège
Disciplines :
Aquatic sciences & oceanology
Author, co-author :
Goffart, Anne  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Hecq, Jean-Henri ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Legendre, Louis;  Laboratoire d'Océanographie de Villefranche (LOV), Villefranche, France
Language :
English
Title :
Nutrient and phytoplankton responses to external forcing in a Mediterranean coastal area unbiased by terrestrial inputs and local activities (Calvi, Corsica)
Publication date :
January 2013
Event name :
IMBER IMBIZO III, the future of marine biogeochemistry, ecosystems and societies, funded as Eurocean Conference
Event organizer :
Alida Bundy, Kon-Kee Liu, Julie Hall, Eileen Hofmann, Lisa Maddison, Lian McMAnus, Wajih Naqvi & Helmuth Thomas
Event place :
Goa, India
Event date :
28-31 janvier 2013
Audience :
International
References of the abstract :
IMBER IMBIZO III, the future of marine biogeochemistry, ecosystems and societies (2013), p 44.
Available on ORBi :
since 22 November 2013

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