Battin, T. Department of Ecology, University of Vienna, tomba@pflaphy.pph.univie.ac.at

 
LINKING CATCHMENT PROCESSES, DOC BIOGEOCHEMISTRY AND STREAMBED BIOFILMS IN ALPINE GLACIER STREAMS
 
The structure and functioning of stream microbial communities are largely controlled by DOC biogeochemistry which in turn reflects catchment and channel processes. Glacier catchments are model systems to investigate such terrestrial/aquatic links since deglaciation generates altitudinal soil gradients and DOC endmembers are relatively simple to allocate. Using fluorescence and absorbance imprints, I traced DOC sources in several streams along a deglaciation gradient in an alpine glacier catchment (Austria, 2400 m a. s. l.). Water geochemistry as imparted by the catchment geology and thermal regime also allowed to discriminate among study sites. I then explored possible effects of DOC sources, water geochemistry and temperature on streambed biofilm structure (matrix carbohydrate exopolymers, biomass) and functioning (bacterial protein production).
 
Day: Thursday, Feb. 4
Time: 03:30 - 03:45pm
Location: Sweeney Center
 
Code: SS33TH0330S