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Microbial Ecology

, Volume 49, Issue 3, pp 425–433 | Cite as

High Heterotrophic Bacterial Production in Acidic, Iron-Rich Mining Lakes

  • N. KamjunkeEmail author
  • J. Tittel
  • H. Krumbeck
  • C. Beulker
  • J. Poerschmann
Article

Abstract

The acidic mining lakes of Eastern Germany are characterized by their extremely low pH and high iron concentrations. Low concentrations of CO2 in the epilimnion due to the low pH and reduced light transmission due to dissolved ferric iron potentially limit phytoplankton primary production (PP), whereas dissolved organic carbon (DOC) may promote heterotrophic production of bacteria (HP). We, therefore, tested whether HP exceeds PP in three lakes differing in pH and iron concentration (mean pH 2.3–3.0, 23–500 mg Fe L−1). Bacterial biomass and HP achieved highest values in the most acidic, most iron-rich lake, whereas PP was highest in the least acidic lake. HP was often higher than PP (ratio HP/PP up to 11), indicating that planktonic PP was not the main carbon source for the bacteria. HP was not related to PP and DOC, but HP as well as bacterial biomass increased with decreasing pH. Light stimulated the formation of ferrous iron, changed the DOC composition, and increased the HP in laboratory experiments, suggesting that iron photoreduction caused DOC degradation. This may explain why we found the highest HP in the most acidic and most rich lake. Overall, the importance of bacteria in the cycling of matter and as a basis for the whole food web seemed to increase in more acidic lakes with higher iron concentrations.

Keywords

Photosynthetic Active Radiation Dissolve Organic Carbon Concentration Bacterial Biomass Acidic Lake Bacterial Growth Efficiency 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We thank Gabriele Dudda, Ines Hübner, Jörn Jander, Silvia Heim, and Lucienn Schneider for technical help, Antje Gerloff for support in primary production measurement, Götz Günter for pigment investigations, Katrin Wendt-Potthoff for data on chemolithotrophic bacteria, and Ursula Gaedke, Walter Geller, and Elanor Bell for constructive suggestions on the manuscript. This paper is based on research project no. 0339746 of the Federal Ministry of Education and Research (BMBF) of Germany.

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Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • N. Kamjunke
    • 1
    Email author
  • J. Tittel
    • 1
    • 2
  • H. Krumbeck
    • 3
  • C. Beulker
    • 3
  • J. Poerschmann
    • 4
  1. 1.Institute of Biochemistry and BiologyUniversity of PotsdamPotsdamGermany
  2. 2.Department of Lake ResearchUFZ-Centre for Environmental Research Leipzig-Halle GmbHMagdeburgGermany
  3. 3.Chair of Water Conservation, Research Station Bad SaarowBrandenburg University of Technology at CottbusBad SaarowGermany
  4. 4.Department of Environmental TechnologyCentre for Environmental Research Leipzig-Halle GmbH (UFZ)LeipzigGermany

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