Naslov
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)

Autori
Layglon, Nicolas ; Misson, Benjamin ; Durieu, Gaël ; Coclet, Clément ; D'Onofrio, Sébastien ; Dang, Duc Huy ; François, David ; Mullot, Jean- Ulrich ; Mounier, Stéphane ; Lenoble, Véronique ; Omanović, Dario ; Garnier, Cédric

Izvornik
Marine pollution bulletin (0025-326X) 156 (2020); 111196, 10

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Sediment resuspension ; Dissolved metals ; Chelex-DGT samplers ; Toulon Bay

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Kemija, Interdisciplinarne prirodne znanosti

POVEZANOST RADA