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Microbial Communities Drive Methane Fluxes From Floodplain Lakes-A Hydrological Gradient Perspective
Sylwia Lew1, Paweł Burandt2, Katarzyna Glińska-Lewczuk2
1Department of Microbiology and Mycology, University of Warmia and Mazury in Olsztyn, Olsztyn, Poland.
Environmental Microbiology
|June 23, 2025
Summary
Methanotrophic bacteria and methanogenic archaea significantly impact greenhouse gas emissions from floodplain lakes. Microbial community structure and water properties influence methane and carbon dioxide fluxes, crucial for ecosystem management.
Area of Science:
- Environmental Microbiology
- Biogeochemistry
- Ecosystem Science
Background:
- Floodplain lakes are dynamic ecosystems influenced by hydrological connectivity and microbial activity.
- Greenhouse gas (GHG) emissions, particularly methane (CH4) and carbon dioxide (CO2), from aquatic systems are a significant area of climate research.
- Understanding the interplay between microbial communities and physicochemical factors is key to predicting GHG fluxes.
Purpose of the Study:
- To investigate the influence of methanotrophic bacteria (MOB) and methanogenic archaea (mGen) on CH4 and CO2 fluxes in floodplain lakes.
- To analyze the relationship between microbial structure (MOB/mGen ratio) and CH4 flux rates across different successional stages.
- To determine the impact of physicochemical water properties on MOB and mGen abundance and activity.
Main Methods:
- Seasonal microbiological and hydrochemical sampling of 10 floodplain lakes.
- Quantification of CH4 and CO2 fluxes.
- Analysis of microbial community structure (MOB/mGen ratio).
- Statistical modeling (Partial Least Squares) to identify correlations between microbial groups and environmental variables.
Main Results:
- MOB and mGen significantly influenced CH4 and CO2 emissions, with microbial structure correlating with CH4 flux rates.
- CH4 fluxes varied significantly across lotic, semi-lotic, and lentic systems (21, 225, 507 mg m-2 day-1, respectively).
- Water temperature, chlorophyll-a, turbidity, and chemical oxygen demand positively correlated with MOB and mGen; NH4-N and NO3-N showed negative impacts on specific microbial groups.
Conclusions:
- Biotic and abiotic interactions in floodplain lakes are complex drivers of GHG emissions.
- The MOB/mGen ratio serves as an indicator of CH4 flux potential in different lake types.
- Findings suggest potential for targeted management strategies to mitigate climate impacts from floodplain ecosystems.
Keywords:
floodplain lakesgreenhouse gasesmGen methanogenic archaeamethanotrophic bacteria (MOB)microbiotaMore Related Videos
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