New insight into riverbed biogeochemistry

Biosciences NG08
Life and Environmental Sciences, Research
Wednesday 9th April 2014 (16:15-17:15)
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Speaker: Professor Mark Trimmer, QMUL

Host: Stefan Krause

Riverbeds are recognized biogeochemical 'hotspots', yet what defines these 'hotspots' and the processes that they mediate is still far from being fully appreciated. Here, using both published and unpublished data, I will highlight how some of my own research is redefining our perception of the cycling of carbon and nitrogen in riverbed sediments. For example, anaerobic ammonium oxidation (anammox) running counter to a gradient of riverbed permeability; simultaneous aerobic and anaerobic branches of the N cycle and the potential for significant and widespread chemosynthetic production coupled to methanotrophy. I measure these processes directly by applying the natural isotopes 15N and 13C either directly in situ or in small scale experiments in the laboratory.