ORBi: Richir Jonathan - Trace element kinetics in contaminated Posidonia oceanica meadow

Reference : Trace element kinetics in contaminated Posidonia oceanica meadow


	Document type :	Scientific congresses and symposiums : Paper published in a book
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
	To cite this reference:	http://hdl.handle.net/2268/124731

Title :	Trace element kinetics in contaminated Posidonia oceanica meadow
Language :	English
Author, co-author :	Richir, Jonathan [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
	Luy, Nicolas [> >]
	Lepoint, Gilles [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
	Biondo, Renzo [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
	Gobert, Sylvie [Université de Liège - ULg > Département de Biologie, Ecologie et Evolution > Océanologie >]
Publication date :	29-May-2012
Main document title :	Proceedings of the Mediterranean Seagrass Workshop 2012
On invitation :	No
Audience :	International
City :	Essaouira
Country :	Morocco
Event name :	3rd Mediterranean Seagrass Workshop
Event date :	du 28 mai 2012 au 01 juin 2012
Event place (city) :	Essaouira
Event country :	Morocco
Abstract :	[en] The seagrass Posidonia oceanica (L.) Delile is widely used since the mid-70th to biomonitor trace elements (TEs). However, there is a lack of knowledge regarding to pollutant kinetics in that species. Posidonia oceanica were in situ contaminated by a mix of 15 TEs (Al, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Mo, Ag, Cd, Pb and Bi) at experimental levels equivalent to 10 (moderate) and 100 (acute) times seawater average concentrations. TEs concentrations were measured by ICP-MS in P. oceanica leaves and rhizomes sampled at regular time intervals, in epiphytes, in water and in sediment. Posidonia oceanica immediately accumulated pollutants from the beginning of experiments; once contaminations ended, TE concentrations came back to their original levels within two weeks, or at least showed a clear decrease. Leaves exhibited different uptake kinetics for many elements (e.g. Cr, Cu, Ag, Bi etc.): the younger growing leaves forming new tissues incorporated chemicals more rapidly than the older senescent leaves. Rhizomes did not show any clear trend, except for Cu, Zn and Bi. Results demonstrate that P. oceanica is a very sensitive sentinel to immediately delineate punctual pollutions similar to what might be measured in contaminated Mediterranean waters. The good response of P. oceanica leaves to pollutant short-term expositions suggests their routine use in regularly scheduled monitoring programs. Nevertheless, to by-pass P. oceanica leaves deciduous character and their capability to detoxify rapidly, long term accumulation recordings would also necessitate belowground tissues analyses.
Target :	Researchers
Permalink :	http://hdl.handle.net/2268/124731

File(s) associated to this reference

There are no fulltext file associated with this reference.

Additional material(s):

	File	Commentary	Version	Size	Access
Open access	MSW12-Richir - ORBI.ppt		-	3.86 MB	View/Open

All documents in ORBi are protected by a user license.

Dspace v1.5