Article (Scientific journals)
Experimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 trace elements
Richir, Jonathan; Luy, Nicolas; Lepoint, Gilles et al.
2013In Aquatic Toxicology, 140-141, p. 157-173
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Keywords :
Posidonia oceanica; Trace element; In situ exposure; Kinetic
Abstract :
[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.
Research Center/Unit :
Laboratoire d'Océanologie, Université de Liège
Disciplines :
Aquatic sciences & oceanology
Earth sciences & physical geography
Author, co-author :
Richir, Jonathan  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Luy, Nicolas
Lepoint, Gilles  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Rozet, Eric ;  Université de Liège - ULiège > Département de pharmacie > Chimie analytique
Alvera Azcarate, Aïda  ;  Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > GeoHydrodynamics and Environment Research (GHER)
Gobert, Sylvie  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Language :
English
Title :
Experimental in situ exposure of the seagrass Posidonia oceanica (L.) Delile to 15 trace elements
Publication date :
2013
Journal title :
Aquatic Toxicology
ISSN :
0166-445X
eISSN :
1879-1514
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
140-141
Pages :
157-173
Peer reviewed :
Peer Reviewed verified by ORBi
Name of the research project :
PhD thesis. Coastal pollution of the Mediterranean and extension of its biomonitoring to trace elements of emerging concern
Funders :
ULg FSR - Université de Liège. Fonds spéciaux pour la recherche
Collectivity of Corsica
Agence de l'eau Rhône Méditerranée Corse
F.R.S.-FNRS - Fonds de la Recherche Scientifique
CFB - Communauté française de Belgique
Funding number :
ARC Race 05/10-333; FRS-FNRS (FRFC 2.4.502.08)
Available on ORBi :
since 27 January 2013

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