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Assessing the responses of Sphagnum micro-eukaryotes to climate changes using high throughput sequencing
Monika K Reczuga1,2,3, Christophe Victor William Seppey2,4, Matthieu Mulot2
1Climate Change Ecology Research Unit, Faculty of Geographical and Geological Sciences, Adam Mickiewicz University, Poznań, Poland.
Climate warming and drought threaten peatlands, vital carbon sinks. Experimental warming and drought reduced micro-eukaryotic diversity, shifting peatland communities towards a more terrestrial state and impacting ecosystem function.
Area of Science:
- Ecology
- Microbiology
- Climate Science
Background:
- Peatlands store a significant portion of global soil organic carbon.
- Climate warming is projected to increase drought frequency and severity.
- Drought and warming can transform peatlands from carbon sinks into carbon sources, accelerating global warming.
Purpose of the Study:
- To investigate the impact of experimental drought and warming on the diversity and community composition of Sphagnum-associated micro-eukaryotes in peatlands.
- To identify potential microbial indicators of climate change in peatland ecosystems.
Main Methods:
- High-throughput sequencing of environmental DNA (eDNA) was used to assess micro-eukaryotic communities.
- Experimental manipulation of drought and warming conditions was applied to peatland ecosystems.
Main Results:
- Micro-eukaryotic diversity significantly decreased under drier conditions.
- The relative abundance of autotrophs increased, while osmotrophs (including Fungi and Peronosporomycetes) decreased.
- Observed changes indicated a shift towards a more terrestrial microbial community structure.
Conclusions:
- Drought and warming alter peatland micro-eukaryotic communities, affecting ecosystem functioning.
- Specific microbial taxa can serve as early indicators of climate change impacts on peatlands.
- Peatland microbial community shifts under drought mirror changes in overall ecosystem function.
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