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Title [sv]
Sjöbakteriers utnyttjande av organiska föreningar: specialister eller generalister?
Title [en]
Niche separation and substrate specialization in heterotrophic freshwater bacterioplankton
Abstract [sv]
Bacteria perform critical biogeochemical processes in aquatic ecosystems. These are variable and depend on the metabolic properties of the organisms present and their abundance. We will study the function and significance of generalist vs. specialist heterotrophs in aquatic bacterial communities under contrasting environmental constraints. Key bacterial groups involved in organic carbon turnover will be identified and we will address the question of whether or not there is coherence between metabolic traits and phylogeny. To study such functional differentiation and niche partitioning we will employ quantitative 454-pyrosequencing mapping of phylogenetically defined bacterioplankton populations to incubations where natural microbial assemblages are experimentally enriched with variable organic substrates. The metabolic features of such phylogenetic groups will also be resolved by single-cell genome amplification with functional gene screens and substrate tracking microautoradiography combined with FISH to assess the ability of dominant bacterioplankton populations to utilize selected organic compounds. The role of resource control will also be studied in relation to other drivers by combined seasonal in situ observations and controlled regrowth experiments. Our work is the first attempt to provide a functional field guide for heterotrophic freshwater bacterioplankton and will advance our mechanistic understanding of microbial processing of detrital carbon in lakes.
Principal InvestigatorBertilsson, Stefan
Coordinating organisation
Uppsala University
2010-01-01 - 2012-12-31
DiVA, id: project:3657Project, id: 2009-03784_VR

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