Long-term monitoring emphasizes impacts of the dredging on dissolved Cu and Pb contamination along with ultraplankton distribution and structure in Toulon Bay (NW Mediterranean Sea, France)

MARINE POLLUTION BULLETIN

卷:156

Article

Layglon, Nicolas¹  Misson, Benjamin¹  Durieu, Gael¹  Coclet, Clement^1,2  D'Onofrio, Sebastien¹  Duc Huy Dang³  Francois, David⁴  Mullot, Jean-Ulrich⁴  Mounier, Stephane¹  Lenoble, Veronique¹  Omanovic, Dario⁵  Garnier, Cedric¹ 

[1] Aix Marseille Univ, Univ Toulon, Mediterranean Inst Oceanog MIO, CNRS,IRD,UM110, Marseille, France

[2] Univ Toulon & Var, EA4323, MAPIEM, Toulon, France

[3] Trent Univ, Sch Environm, Chem Dept, Peterborough, ON, Canada

[4] LASEM Toulon, Base Navale Toulon, BP 61, F-83800 Toulon, France

[5] Rudjer Boskovic Inst, Ctr Marine & Environm Res, POB 180, Zagreb 10002, Croatia

关键词: Sediment resuspension;    Dissolved metals;    Chelex-DGT samplers;    Toulon Bay;   

DOI  :  10.1016/j.marpolbul.2020.111196

来源: Elsevier

【 摘 要 】

A long-term monitoring during dredging and non-dredging periods was performed. Total and dissolved Cu and Pb concentrations, DGT-labile Pb, ultraphytoplankton abundance and structure were monitored at four sites: dredging site, dumping site (inside/outside of a geotextile bag) and reference site. During the reference period (non-dredging), an increasing contamination in Pb, Cu and a progressive shift from Synechococcus to photosynthetic picoeukaryotes dominance was observed from reference to dumping site. Pb concentrations were significantly higher during dredging period, pointing out sediment resuspension as Pb major source of contamination. Unlike Pb, Cu concentrations were not statistically different during the two periods. Dredging period did not impact on ultraphytoplankton abundance and structure but influence heterotrophic prokaryotes abundance. Sediment resuspension is therefore a major driver of chemical and biological qualities in Toulon Bay. Furthermore, although the geotextile bag reduces particulate transport of the dredged sediment, the transport in the dissolved phase remains a major problem.

【 授权许可】

Free