Professor Roger Jones:Aquatic Sciences Division, Department of Biological and Environmental Science University of Jyväskylä, Finland, r.jones@cc.jyu.fi |
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Shifting paradigms at the base of lake food webs |
| The established paradigm has been that lake food webs are built upon the autochthonous supply of carbon and energy derived from phytoplankton photosynthesis. This paradigm has been progressively shifting, although (as always) new views take time to become accepted and particularly to penetrate text books. I will summarise some of the shifts that have been taking place and will illustrate them using results from my research groups. We have worked extensively on the possible role of terrestrial organic carbon inputs from the catchment (allochthonous organic matter) as an energy supplement to lake food webs. We have also made extensive use of stable isotope analysis as a tool to help distinguish different carbon sources in lake food webs. More recently we have become intrigued by the methane generated by anaerobic decomposition of organic matter and subsequently oxidised by methanotrophic bacteria at oxic-anoxic interfaces. Might this DOM-methanogen-methane-methanotroph pathway also provide an important additional support for lake food webs? I will explore these ideas using our results from Loch Ness, Scotland, and |
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Ort |
| 03.09.2009 16:00 Uhr Großer Hörsaal |
© IGB |