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

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Author

Summary, in 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.

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

Canadian Science Publishing, NRC Research Press

Topic

  • Biological Sciences

Status

Published

Research group

  • Aquatic Ecology

ISBN/ISSN/Other

  • ISSN: 1205-7533