Environmental Monitoring and Assessment, 2015, Vol.187(7), p.1(13)
Byline: Norbert Kamjunke (1,2), Margarete Mages (1), Olaf Buttner (3), Hanna Marcus (1), Markus Weitere (1) Keywords: Nutrients; Stoichiometry; Heavy metals; Total reflection X-ray fluorescence spectrometry (TXRF); Stream biofilms; River Bode Abstract: As benthic biofilms mediate essential functions in stream ecosystems (e.g., carbon flux, storage of nutrients and other substances), the element-specific regulation of the biofilm composition is of great interest. We tested whether (1) the elemental composition of biofilms is related to that of the water column and (2) there are different accumulation patterns from the dissolved phase (adsorption) and the particulate phase (incorporation of suspended matter). We analysed biomass parameters, nutrients and metals in biofilms and surface waters at 28 sites within a stream network (Bode catchment, Germany). Algal biomass in biofilms was dominated by diatoms. The P/C ratio in biofilms was positively related to total phosphorus of surface water (and to the proportion of agricultural area in the catchment) indicating phosphorus limitation of biofilms, whereas the N/C ratio was not related to nitrate levels of surface water, and neither the P/C nor the N/C ratio to the concentration of dissolved organic carbon (DOC) of surface water. Biofilms were enriched in metals compared to their concentrations in water. The metals in biofilms were positively related to the concentration of dissolved metals in surface water for iron and strontium (but not for manganese, copper, zinc, arsenic or lead) and to the concentrations of particle-associated metals of surface waters for strontium and lead. Manganese and arsenic were the metals with a negative effect on the biomasses of biofilm diatoms and cyanobacteria. Overall, we observed element-specific accumulation patterns in biofilms with selected elements being related to the water column while others were probably subject to biofilm-internal processes. Author Affiliation: (1) Department of River Ecology, Helmholtz-Centre for Environmental Research-UFZ, Bruckstra[sz]e 3a, 39114, Magdeburg, Germany (2) Department of Lake Research, Helmholtz-Centre for Environmental Research-UFZ, Bruckstra[sz]e 3a, 39114, Magdeburg, Germany (3) Department of Aquatic Ecosystem Analysis and Management, Helmholtz-Centre for Environmental Research-UFZ, Bruckstra[sz]e 3a, 39114, Magdeburg, Germany Article History: Registration Date: 03/06/2015 Received Date: 09/05/2014 Accepted Date: 03/06/2015 Online Date: 16/06/2015 Article note: Electronic supplementary material The online version of this article (doi: 10.1007/s10661-015-4664-6) contains supplementary material, which is available to authorized users.
X-Ray Spectroscopy – Analysis ; Fluorescence – Analysis ; Heavy Metals – Analysis ; Water Resources – Analysis ; Adsorption – Analysis ; Ecosystems – Analysis ; Arsenic – Analysis
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