Reference : Seagrass response to in situ trace element contaminations
Scientific congresses and symposiums : Poster
Physical, chemical, mathematical & earth Sciences : Multidisciplinary, general & others
http://hdl.handle.net/2268/99192
Seagrass response to in situ trace element contaminations
English
Richir, Jonathan mailto [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Luy, Nicolas [> >]
Lepoint, Gilles [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Biondo, Renzo [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Vermeulen, Simon [> >]
Gobert, Sylvie [Université de Liège - ULg > Département des sciences et gestion de l'environnement > Océanologie >]
Sep-2011
A0 (.pub), A4 (.bmp, .pdf)
Yes
No
International
12éme Congrès de la Fédération Européenne d'Ecologie
du 26 au 28 septembre 2011
Fédération Européenne d'Ecologie
Avilà
Espagne
[en] seagrass ; trace elements ; in situ experimental contaminations
[en] The Mediterranean seagrass Posidonia oceanica (L.) Delile has been widely used since the mid-seventies as bioindicator to monitor trace element (TE) coastal pollution. However, there is a lack of knowledge regarding to that seagrass contamination and decontamination kinetics. For the first time, Posidonia were experimentally in situ contaminated in 2009, at 10m depth in Calvi Bay (Corsica), by a mix of 15 TE (Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi). Trace element concentrations were measured by DRC-ICP-MS in leaves, rhizomes and in overall shoots sampled at regular time intervals.
P. oceanica immediately accumulated pollutants from the beginning of experiments; once contaminations ended, TE concentrations came back close to their original levels within 2 weeks, or at least showed a clear decrease. Posidonia leaves exhibited different uptake kinetics for many elements (Cr, Cu, Zn, Ag, Cd, Pb and Bi): the younger growing leaves incorporated chemicals more rapidly than the older ones. Rhizomes did not show any clear trend, except for Cu, Zn and Bi. These results demonstrate that Posidonia is a very sensitive sentinel to immediately delineate punctual pollutions similar to what might be measured in contaminated Mediterranean waters. The very good response of Posidonia leaves to pollutant short term expositions suggests their routine use in regularly scheduled monitoring programs. Nevertheless, to by-pass Posidonia leaves deciduous character and their capability to detoxify rapidly, long term accumulation recordings also necessitate below-ground tissues analyses.
Laboratoire d'Océanologie
Evolution récente de la pollution par les éléments traces dans le milieu marin: cas de la Méditerranée nord-occidentale.
Researchers
http://hdl.handle.net/2268/99192
copyright sur la photo 1: Mesocosm in Posidonia bed (10m depth)

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