Tembi: Klimagetriebene Veränderungen der Biodiversität von Mikrobiota
Klimagetriebene Veränderungen der Biodiversität von Mikrobiota - TemBi
In the context of global climate change in the last decades, even in Germany changes in air temperature have been detected, affecting the aquatic environment and the organisms living in it. The selected sampling site, Lake Stechlin located in the North of Brandenburg, showed an increase in surface water temperature of 1.5°C in the years from 1958 to 2008.
The aim of this project is to examine the changes in biodiversity and in the function of microbiota in physicochemical pathways of Lake Stechlin as well as the correlation with the aquatic carbon budget. With a delay of 25 years, Lake Stechlin shows a decrease in water quality after reduction of external resources. This could be based on the detected climate change.
Besides of the insights in changes of biodiversity and in the resulting biogeochemical functions of microbiota, the project will contribute to the development of future management strategies. Innovative large-scale enclosure experiments are used to simulate different climate change scenarios and to examine the effects of aquatic communities and habitats. For this, biodiversity and functions are tracked in manipulated enclosures and in the lake on different spatial, temporal and methodological levels.
Our subproject (TP6) covers the analysis of pelagic ant benthic protistan communities focussing on their biodiversity and abundance and the response to changes in abiotic factors such as temperature, and oxygen concentration. The major aim of this research is on the one hand to tag important protistan key species in limnic systems and their specific reaction on future climate change and to identify a potential overlap of pelagic and benthic protistan communities and their impact on biogeochemical pathways. Qualitative diversity analysis will be conducted by RNA-Extraction, pyrosequencing and phylogenetic analyses. Quantitative data are obtained from fluorescence microscopy analysis. In combination with results from the other subprojects this study will be used for description of the response of limnic food webs to climate change.
Dr. Peter Casper & Dr.Hans-Peter Grossart
Alte Fischerhütte 2
Figure 1: Experimental mesocosms in Lake Stechlin. Left: View of the mesocosm facilities from above (Foto: P.Casper); Right: Sampling of the mesocosms (Foto: IGB)