Reference : Evidence for wastewater influence in a low impacted area throughout stable isotope analy...
Scientific congresses and symposiums : Poster
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/7428
Evidence for wastewater influence in a low impacted area throughout stable isotope analyses of the limpet Patella caerulea and epilithic biofilms
English
Vermeulen, Simon mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Océanographie physique >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Gobert, Sylvie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Jan-2009
A0
Yes
International
Aquatic Sciences Meeting
du 25 janvier 2009 au 30 janvier 2009
Advancing the Science of Limnology and Oceanography
Nice
France
[en] Eutrophication ; Indicators ; Stable isotopes
[en] Eutrophication is considered to be one of the main threats to marine environments leading to changes in trophic status of ecosystems and alteration of biological diversity. Carbon and Nitrogen stable isotopes analyses were performed on the limpet Patella caerulea and one of its food sources (epilithic biofilms) to assess their potential as early indicators of eutrophication. Samples were seasonally collected in 2005-2006 on five locations gradually exposed to urban sewage in the Calvi Bay and in the Marseilles harbour. Stable isotope signatures of Patella caerulea muscles exhibited steady site - specific values over seasons. In contrast to this time – integrated signal, wide variations in biofilm values show that either composition or isotopic ratios of food sources may vary greatly in time and space. Elevated δ15N values of limpets and biofilms, typical of wastewater influence but unrelated to nitrogen loads, indicate the biological availability of sewage-derived nitrogen in the Calvi Bay and the Marseilles harbour. A reference level of δ15N values is rapidly reached with increasing depth that indicates the limited vertical extent of pollution in the Calvi Bay.
Centre Interfacultaire de Recherches en Océanologie - MARE
ARC - RACE 05/10333
Rapid Assessment of the Coastal marine Environment
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/7428

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