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Microbial indicator groups in acidic mining lakes
Dirk F Wenderoth1, Wolf-Rainer Abraham
1National Research Center for Biotechnology, Environmental Microbiology, Mascheroder Weg 1, D-38124 Braunschweig, Germany.
Environmental Microbiology
|January 13, 2005
Summary
Microbial communities in acidic lakes are grouped by chemical type. Specific groups of bacteria, not single species, indicate lake chemistry, revealing insights into microbial ecology in extreme environments.
Area of Science:
- Environmental microbiology
- Aquatic chemistry
- Molecular ecology
Background:
- Acidic lakes present unique environments for microbial life.
- Understanding microbial community structure is key to understanding lake ecosystems.
- Salt composition significantly influences aquatic microbial diversity.
Purpose of the Study:
- To analyze the salt composition of acidic lakes.
- To compare microbial communities using 16S rDNA-based single-strand conformation polymorphism (SSCP).
- To identify microbial indicators of distinct lake types.
Main Methods:
- Analysis of salt composition in 14 acidic lakes.
- Microbial community profiling using 16S rDNA SSCP fingerprints.
- Multivariate discriminant analysis to identify indicator operational taxonomic units (OTUs).
Main Results:
- Lakes were classified into three chemically distinct types.
- Seven specific OTUs were identified as indicative of particular lake types.
- These indicator OTUs included Ferromicrobium acidophilum, Bacillus pumilus, Acidophilium organovorum, Paenibacillus chibensis, Acidocella sp., and two alpha-Proteobacteria.
Conclusions:
- Microbial communities in these acidic lakes are structured by ionic composition.
- Indicator groups, rather than single species, characterize specific lake types.
- This highlights the importance of community-level responses to environmental factors.