- Effects of 12 years’ operation of a sewage treatment plant on trace metal occurrence within a Mediterranean commercial sponge (Spongia officinalis, Demospongiae)
- Producteur(s)
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- Type de producteur
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- Nature de l'étude
- 2005
- Cortiou, Niolon, Port-Cros
- Périmètre
- Etude localisée
- Thèmes
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- Mots-clés
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- Type d'étude
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- ARBE - Site internet de l'Observatoire Régional Eau et Milieux Aquatiques
- Eaufrance - Site internet du bassin Rhône-Méditerranée
- Ville de Marseille - OpenData : Base de données ouvertes de la ville
- Parc national des Calanques - Portail documentaire
- OiEau, OFB - Portail documentaire Eau & biodiversité
- Objectif
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The present field study uses Spongia officinalis for assessing trace metals occurrence in time and space within Mediterranean rocky communities. Nine sites were selected in the Marseille area for studying spatial trends in 12 metal concentrations. Long term changes in 8 metal concentrations were assessed at sites that had been sampled before and 12 years after the opening of a treatment plant.
- Conclusion
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Spongia officinalis highly concentrated all the trace metal surveyed excepted Hg and Cd. The overall contamination level registered provided a classification of the study sites which is congruent with that given by other studies on pollutant accumulation in neighbouring sandy-bottoms or benthic assemblages. Among the metals studied, Fe, Pb, Cr are those that best highlighted a pollution gradient. In the present study, only Cd concentration did not vary in space. Except for Ni, all pollutant concentrations clearly decreased between 1984 and 1999. This very impressive decrease in heavy metal concentrations within the Marseille area represents an indisputable evidence of the improvement of the seawater quality resulting from 12 years’ operation of the Marseille sewage plant. Moreover, the significant decrease also recorded in the reference population at Port-Cros might reflect an overall improvement in the seawater quality of the NW Mediterranean.
Ce projet a été financé par l’ARS PACA et la DREAL PACA labellisées PRSE pour la partie Fos-sur-Mer et par l’OHM BMP pour la partie Bassin Minier de Provence.
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