Reference : Potential early indicators of anthropogenically derived nutrients : a multiscale stable ...
Scientific journals : Article
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/90396
Potential early indicators of anthropogenically derived nutrients : a multiscale stable isotope analysis
English
Vermeulen, Simon mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Sturaro, Nicolas 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 >]
Bouquegneau, Jean-Marie mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Jan-2011
Marine Ecology. Progress Series
Inter-Research Science Publishing
422
9-22
Yes
International
0171-8630
1616-1599
Oldendorf Luhe
Germany
[en] Stable isotopes ; Eutrophication ; Patchiness ; Gastropods ; Biofilms ; NW Mediterranean
[en] Increasing human pressure along Mediterranean coastlines raises the need to define
sensitive bioindicators that provide an early response to nutrient enrichment. We performed multiscale carbon and nitrogen stable isotope analyses on the limpet Patella caerulea, the snail Monodonta turbinata, epilithic biofilms, and the macroalga Rissoella verruculosa inhabiting the rocky midlittoral zone. Samples were seasonally collected in 2006 from 5 sites exposed to a range of anthropogenic discharges in the Revellata Bay area and in Marseille harbour (France). All bioindicators exhibited strongly elevated δ15N values at impacted sites compared to pristine ones, which revealed the biological availability of anthropogenically derived nutrients. Only epilithic biofilms tended to show both the occurrence of nutrient pulses during the tourist season and a δ13C response at impacted sites. In contrast to macroalgae, which exhibited a somewhat equivocal signal, gastropods and especially M. turbinata provided the best time-integrated picture of the graduated exposure of the 5 sites to anthropogenic impact. Results also showed first evidence of large isotopic variability at a scale of tens of metres, close to that found at the kilometre scale. The intra- and interspecific isotopic variability in gastropods may be explained by the patchiness of resources and specific morphological and behavioural features, but these factors do not greatly hamper their potential as early bioindicators of wastewater disturbances.
Centre Interfacultaire de Recherches en Océanologie - MARE
Communauté française de Belgique - CfB ; Fonds de la Recherche Scientifique (Communauté française de Belgique) - F.R.S.-FNRS
Rapid Assessment of the Coastal marine Environment
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/90396
10.3354/meps08919

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