STARDUST II - Spatial and Temporal Assessment
of high Resolution Depth profiles Using novel Sampling Technologies The fate of pollutants in fluvial and marine sediments in cross-border zones
Links between bacterial communities in marine sediments and trace metal geochemistry as measured by in situ DET/DGT approaches
Gillan, D.C.; Baeyens, W.; Bechara, R.; Billon, G.; Denis, K.; Grosjean, P.; Leermakers, M.; Lesven, L.; Pede, A.; Sabbe, K.; Gao, Y. (2012). Links between bacterial communities in marine sediments and trace metal geochemistry as measured by in situ DET/DGT approaches. Mar. Pollut. Bull. 64(2): 353-362. dx.doi.org/10.1016/j.marpolbul.2011.11.001
Our current view about the relationship between metals and bacteria in marine sediments might be biased because most studies only use ex situ approaches to quantify metals. The aim of the present research was to compare ex situ and in situ methods of metal measurement (DET and DGT - diffusive equilibration or diffusive gradients in thin-films) and relate the results with two commonly used microbiological variables (bacterial biomass and bacterial diversity as revealed by DGGE). No previous studies have used such in situ approaches in microbial ecology. For biomass and most of the investigated trace metals (Ag, Cd, Sn, Cr, Ni, Cu, Pb, and Al) no significant correlations were found. The exceptions were Fe, Mn, Co, and As which behave like micronutrients. For bacterial diversity, no relevant relationships were found. We conclude that in situ methods are more adapted tools for microbial ecologists but that ex situ approaches are still necessary.
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STARDUST II is a project funded by the INTERREG III A programme (France/Walloon Region/Flanders
French-Flemish subprogramme) of the European Community's Regional Development Fund.
Hosted by the Flanders Marine Institute (VLIZ)
