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Factors influencing organochlorine uptake in age-0 brown trout (Salmo trutta) in lotic environments

Author:
  • Olof Berglund
  • Per Larsson
  • Christer Brönmark
  • L Greenberg
  • Anders Eklöv
  • Lennart Okla
Publishing year: 1997
Language: English
Pages: 2767-2774
Publication/Series: Canadian Journal of Fisheries and Aquatic Sciences
Volume: 54
Issue: 12
Document type: Journal article
Publisher: National Research Council Canada

Abstract english

In 1994 and 1995, we investigated the relationship between stream morphology and water chemistry and levels of organochlorines (HCB, PCB, and DDT) in young-of-the-year brown trout (Salmo trutta) from 25 streams in southern Sweden. Contrary to earlier findings for lakes, we found a positive relationship between trophic status (total phosphorus) and uptake of persistent pollutants in stream biota (trout). This difference between benthic, stream environments and pelagic, lake environments may be related to processes affecting pollutant uptake, i.e., pollutant "spiralling" or the shift from heterotrophy to autotrophy in streams. Land use in the catchment area of the streams also affected pollutant levels in trout, with higher levels in agricultural landscapes and lower levels in forested areas. Size of catchment area, however, did not influence uptake of pollutants in trout. The results indicate that eutrophication of streams by agricultural activities and excessive nutrient loading may increase uptake of persistent pollutants in stream biota.

Keywords

  • Biological Sciences

Other

Published
  • ISSN: 1205-7533
Christer Brönmark
E-mail: christer [dot] bronmark [at] biol [dot] lu [dot] se

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+46 73 081 55 48

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