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Bacterioplankton Community Composition in Five Lakes Differing in Trophic Status and Humic Content
1Department of Limnology, Evolutionary Biology Centre, Uppsala University, Norbyv. 20, SE-752 36 Uppsala, Sweden
Microbial Ecology
|October 12, 2000
Summary
Bacterioplankton community structure in Swedish lakes is influenced by microzooplankton and algae, indirectly linked to lake nutrient levels. Water color had a minor impact on these microbial communities.
Area of Science:
- Ecology
- Microbiology
- Limnology
Background:
- Bacterioplankton are crucial for aquatic ecosystem functioning.
- Understanding factors shaping bacterioplankton communities is key to aquatic ecology.
- Lake characteristics like nutrient content and water color can influence microbial life.
Purpose of the Study:
- To investigate the relationship between lake type and bacterioplankton community composition.
- To identify key environmental and biological factors affecting bacterioplankton structure in Swedish lakes.
Main Methods:
- Studied five Swedish lakes with varying nutrient content and water color.
- Utilized denaturing gradient gel electrophoresis (DGGE) of 16S rDNA for community analysis.
- Employed canonical correspondence analysis (CCA) to correlate community data with environmental variables.
Main Results:
- Microzooplankton, cryptophyte, and chrysophyte biomasses were strongly correlated with bacterioplankton community composition (DGGE patterns).
- Lake trophic status indirectly influenced bacterioplankton structure through these biological factors.
- Water color showed a less significant correlation with bacterioplankton community structure.
Conclusions:
- Microbial grazing and phytoplankton composition significantly impact bacterioplankton community structure.
- Lake nutrient status indirectly shapes bacterioplankton communities via food web interactions.
- These findings highlight the complex interplay between abiotic factors, biotic interactions, and microbial communities in freshwater ecosystems.
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