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La Tour du Valat

Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Relationships between heavy metal concentrations in sediments and eelgrass and environmental variables (Zostera marina, Thau lagoon, France) (2004)
Auteurs :	M. L. De Casabianca, Auteur ; P. S. Tari, Auteur ; R. Gauchet, Auteur ; C. Raynaud, Auteur ; V. Rigollet, Auteur
Type de document :	Article
Dans :	Vie et Milieu - Life and Environment (54(4) décembre 2004)
Article en page(s) :	231-238
Langues:	Anglais
Résumé :	This study focuses during one year on six heavy metals (Cu, Ni, Fe, Pb, Cr, Zn) sampled monthly in sediments, in leaves and roots of Zostera marina L. eelgrass of Thau lagoon (Mediterranean France), where the shellfish farming activity is dominant. These heavy metal concentrations were analysed in relation to twelve environmental variables measured in parallel: rain fall, temperature and salinity of water bottom, C, N and P sediment content, total inorganic nitrogen (TIN) and dissolved reactive phosphorus (DRP) of water bottom and sediment pore water, biomass and density of eelgrass. The PCA of environmental variables, with the added heavy metal concentrations of the three compartments (sediments, roots and leaves) in supplementary data, underlines especialy the major relationships between specific concentrations and environmental and plant variables. The regression analysis precises the main direct correlations joining heavy metal concentrations and environmental variables: the inverse correlation between Cu content in sediments and shoot density of eelgrass (y = -0.5x + 83, with r(2) = 0.8); (ii) the positive correlation between Cu content in leaves and rain fall (y = 0.14x + 7, with r(2) = 0.6), and (iii) those between Cu content in sediments and carbon in sediments, (y = 2x + 5, with r(2) = 0.5). This study underlines the importance of the leaching of elements from the surrounding land and the rate of water renewal on the relatively high levels of toxic metals (copper and lead) in the sediments of a marine lagoon exploited for shellfish culture. Significantly, this study confirms the bio-accumulation of these metals in certain parts of a marine phanerogam and demonstrates that this bioaccumulation is a function of plant growth that is itself dependent upon the characteristics of the environment.
En ligne :	https://wwwphp.obs-banyuls.fr/Viemilieu/index.php/volume-54-2004/54-issue-4.html

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