title: Links between bacterial communities in marine sediments and trace metal geochemistry as measured by in situ DET/DGT approaches.
abstract: 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.
authors.affiliation: Proteomics and Microbiology Laboratory, Mons University, Mons, Belgium. david.gillan@umons.ac.be
authors.forename: David C
authors.initials: DC
authors.lastname: Gillan
authors.forename: Willy
authors.initials: W
authors.lastname: Baeyens
authors.forename: Rafeh
authors.initials: R
authors.lastname: Bechara
authors.forename: Gabriel
authors.initials: G
authors.lastname: Billon
authors.forename: Kevin
authors.initials: K
authors.lastname: Denis
authors.forename: Philippe
authors.initials: P
authors.lastname: Grosjean
authors.forename: Martine
authors.initials: M
authors.lastname: Leermakers
authors.forename: Ludovic
authors.initials: L
authors.lastname: Lesven
authors.forename: Annelies
authors.initials: A
authors.lastname: Pede
authors.forename: Koen
authors.initials: K
authors.lastname: Sabbe
authors.forename: Yue
authors.initials: Y
authors.lastname: Gao
mesh_terms: D044822:Biodiversity; D018533:Biomass; D002623:Chemistry Techniques, Analytical; D004784:Environmental Monitoring / Q000379:methods*; D019015:Geologic Sediments / Q000737:chemistry* / Q000382:microbiology*; D008670:Metals / Q000032:analysis*; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D008670:Metals; D014874:Water Pollutants, Chemical