No full text
Unpublished conference/Abstract (Scientific congresses and symposiums)
New insights for an old topic: seagrasses as bioindicators of coastal trace element pollution
Richir, Jonathan; Lejeune, Pierre; Gobert, Sylvie
2014Seagrasses in Europe: Threats, responses and management
 

Files


Full Text
No document available.
Full Text Parts
Richir et al._cost conference_Portugal_mars 2014_submitted.doc
Author postprint (33.79 kB)
Download
COST6marsGobert.pdf
Author postprint (8.89 MB)
Download
COST.pptx
Author postprint (35.23 MB)
Download

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Posidonia oceanica; trace elements
Abstract :
[en] The marine magnoliophyte Posidonia oceanica (L.) Delile has been widely used since the mid-70th to biomonitor the coastal pollution of the Mediterranean in Cr, Ni, Cu, Zn, Cd, Pb and/or Fe. In contrast, other trace elements (TEs) like As, V, Ag, Be, Al, Mn, Co, Se, Mo, Sn, Sb and Bi, many of them categorized as TEs of environmental emerging concern, have been subject to nearly no ecotoxicological survey with that species. It has been shown that the French Mediterranean littoral was submitted to local, diffuse and/or chronic contaminations both by TEs broadly or little biomonitored with P. oceanica; high TE levels could further be linked to specific anthropic activities such as agriculture (Mo), mining (Cr, Sb, Zn), industries (As), storage and refinement of oil products (V, Pb) or presence of major ports and urban centres (Sn, Bi, Ag). It seems therefore necessary to expand the short list of the seven metals commonly monitored to other TEs, what is today easily achievable as current analytical methods allow the simultaneous determination of all a series of TEs within the same sample. Furthermore, only a multielement analysis in appropriate bioindicator species allow to correctly intercompare the pollution status of numerous sampling sites. To do this, we have calculated proper environmental indices, the trace element pollution index TEPI and the trace element spatial variation index TESVI. The TEPI is an index of the global contamination of a site, giving the same weight to each TE after mean normalization of their environmental concentrations. The TESVI estimates the global spatial variability of environmental concentrations of each TE levels, taking into account both punctual contaminations in impacted sites and the overall coastal spatial heterogeneity between all monitored sites.These two indices were successfully applied both at large (French Mediterranean littoral) and small (a Bay) spatial scales. Furthermore, they can be used in the framework of an intercomparative study compiling data from any previous monitoring surveys. We also highlighted that the ecophysiology and surrounding levels of TEs influenced in an equivalent manner the bioaccumulation process of TEs in P. oceanica. Consequently, this natural cyclic evolution of TE concentrations should be systematically quantified in regional reference sites. Finally, the rapid and proportionnal accumulation of TEs in P. oceanica traps huge amounts of contaminants and can stock them for longer periods of time in their bellow grounds tissues. P. oceanica meadows therefore play an efficient role of natural filter of TE coastal pollutions.
Disciplines :
Environmental sciences & ecology
Aquatic sciences & oceanology
Author, co-author :
Richir, Jonathan  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Lejeune, Pierre;  STARESO sas
Gobert, Sylvie  ;  Université de Liège - ULiège > Département de Biologie, Ecologie et Evolution > Océanologie
Language :
English
Title :
New insights for an old topic: seagrasses as bioindicators of coastal trace element pollution
Publication date :
March 2014
Event name :
Seagrasses in Europe: Threats, responses and management
Event organizer :
Centre of Marine Sciences (CCMAR) ; Rui Santos, Cost Action ES0906
Event place :
Olhoa, Portugal
Event date :
4 au 6 March 2014
Audience :
International
Available on ORBi :
since 25 February 2014

Statistics


Number of views
130 (27 by ULiège)
Number of downloads
161 (17 by ULiège)

Bibliography


Similar publications



Contact ORBi