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Freshwater Microbial Ecology01:24

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Establishment of Microbial Eukaryotic Enrichment Cultures from a Chemically Stratified Antarctic Lake and Assessment of Carbon Fixation Potential
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TBT causes regime shift in shallow lakes.

Carl D Sayer1, Daniel J Hoare, Gavin L Simpson

  • 1Environmental Change Research Centre (ECRC), Department of Geography, University College London, Gower Street, London WC1E 6BT, UK. c.sayer@ucl.ac.uk

Environmental Science & Technology
|September 27, 2006
PubMed
Summary

Tributyltin (TBT), a boat paint biocide, has unknown freshwater impacts. Sediment core analysis reveals TBT introduction correlates with submerged vegetation loss, suggesting ecosystem damage in shallow lakes.

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Area of Science:

  • Environmental Toxicology
  • Freshwater Ecology
  • Ecosystem Dynamics

Background:

  • Tributyltin (TBT) is an organotin compound utilized as a biocide in antifouling paints since the 1960s.
  • Marine ecosystem damage, including imposex in mollusks and aquatic toxicity, is linked to TBT.
  • The effects of TBT on freshwater ecosystems remain largely unexplored.

Purpose of the Study:

  • To investigate the potential impacts of TBT on freshwater ecosystems.
  • To analyze historical TBT contamination in shallow lake sediments.
  • To correlate TBT presence with ecological changes in aquatic communities.

Main Methods:

  • Analysis of dated sediment cores from recreationally boated shallow lakes.
  • Examination of ecological shifts associated with the initial detection of TBT.
  • Hypothesizing TBT's role in ecosystem regime shifts.

Main Results:

  • The first evidence of TBT in sediment cores coincided with a significant decline in submerged vegetation.
  • A loss of associated diverse animal communities was observed concurrently with TBT introduction.
  • TBT may have contributed to the replacement of macrophytes by phytoplankton in eutrophic lakes.

Conclusions:

  • TBT contamination may have caused previously unrecognized damage to freshwater ecosystems.
  • TBT could promote phytoplankton blooms by reducing grazing organisms in eutrophic lakes.
  • Findings suggest potential parallels in freshwater ecosystems globally.