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Effects of Planktivorous and Benthivorous Fish on Organisms and Water Chemistry in Eutrophic Lakes by Gunnar Andersson; Hans Berggren; Gertrud Cronberg; Curt Gelin is a Environmental Science article available to read on EtoBox.

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The effects of planktivorous and benthivorous fish on benthic fauna, zooplankton, phytoplankton and water chemistry were studied experimentally in two eutrophic Swedish lakes using cylindrical enclosures . In enclosures in both lakes, dense fish populations resulted in low numbers of benthic fauna and planktonic cladocerans, high concentration of chlorophyll, blooms of bluegreen algae, high pH and low transparency . In the soft-water Lake Trummen, total phosphorus increased in the enclosure with fish, but in the hard-water Lake Bysjon total phosphorus decreased simultaneously with precipitation of calcium carbonate . Enclosures without fish had a higher abundance of benthic fauna and large planktonic cladocerans, lower phytoplankton biomass, lower pH and higher transparency . The changes in enclosures with fish can be described as eutrophication, and those in enclosures without fish as oligotrophication . The possibility of regulation of fish populations as a lake restoration method is discussed .

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Author

Gunnar Andersson; Hans Berggren; Gertrud Cronberg; Curt Gelin

Publisher

Springer Science and Business Media LLC

Published

1978

Language

EN

Field

Environmental Science (Physical Sciences)