Reference : Experimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 tr...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
Life sciences : Aquatic sciences & oceanology
http://hdl.handle.net/2268/150487
Experimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 trace elements
English
Richir, Jonathan mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Luy, Nicolas [> >]
Lepoint, Gilles mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Rozet, Eric mailto [Université de Liège - ULg > Département de pharmacie > Chimie analytique >]
Alvera Azcarate, Aïda mailto [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER) >]
Gobert, Sylvie mailto [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
2013
Aquatic Toxicology
Elsevier Science
140-141
157-173
Yes (verified by ORBi)
International
0166-445X
Amsterdam
The Netherlands
[en] Posidonia oceanica ; Trace element ; In situ exposure ; Kinetic
[en] The Mediterranean seagrass Posidonia oceanica (L.) Delile has been used for trace element (TE) biomonitoring since decades ago. However, present informations for this bioindicator are limited mainly to plant TE levels, while virtually nothing is known about their fluxes through P. oceanica meadows. We therefore contaminated seagrass bed portions in situ at two experimental TE levels with a mix of 15 TEs (Al, V,Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi) to study their uptake and loss kinetics in P. oceanica. Shoots immediately accumulated pollutants from the beginning of exposures. Once contaminations ended, TE concentrations came back to their original levels within two weeks, or at least showed a clear decrease. P. oceanica leaves exhibited different uptake kinetics depending on elements and leaf age: the younger growing leaves forming new tissues incorporated TEs more rapidly than the older senescent leaves. Leaf epiphytes also exhibited a net uptake of most TEs, partly similar to that of P. oceanica shoots. The principal route of TE uptake was through the water column, as no contamination of superficial sediments was observed. However, rhizomes indirectly accumulated many TEs during the overall experiments through leaf to rhizome translocation processes. This study thus experimentally confirmed that P.oceanica shoots are undoubtedly an excellent short-term bioindicator and that long-term accumulations could be recorded in P. oceanica rhizomes.
Laboratoire d'Océanologie, Université de Liège
Funding was provided by the University of Liège (Fonds spéciaux), by the Territorial Collectivity of Corsica, by The French Water Agency (PACA-Corsica), by the FRS-FNRS (FRFC 2.4.502.08) and by the French Community of Belgium (ARC Race 05/10-333).
PhD thesis. Coastal pollution of the Mediterranean and extension of its biomonitoring to trace elements of emerging concern
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/150487
also: http://hdl.handle.net/2268/153741
10.1016/j.aquatox.2013.05.018

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