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Biomanipulating streams: A supplementary tool in lake restoration
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
Technical University of Denmark, Denmark.
EAWAG Swiss Federal Institute of Aquatic Science and Technology, Switzerland; Institute of Ecology and EvolutionUniversity of Bern, Switzerland.
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2019 (English)In: Hydrobiologia, ISSN 0018-8158, E-ISSN 1573-5117, Vol. 829, no 1, p. 205-216Article in journal (Refereed) Published
Abstract [en]

Removal of cyprinid fish is a widely used biomanipulation tool to transform turbid shallow eutrophic lakes in north temperate regions into a clear water state. We here evaluate the removal of cyprinids from streams as a supplement to lake fishing. Since cyprinids often aggregate in high densities in lake inlet/outlet streams during winter migration, removal of fish in this space-confined habitat may be cost-efficient as compared to fish removal in the lake habitat. In two consecutive years, we annually removed up to 35% of the dominant cyprinids from an inlet stream to a lake and argue that this could easily be increased with a more targeted fishing effort. Concurrently, we monitored species- and length-specific variation in migration propensity, to explore how this relates to efficient fish removal. Smaller planktivores generally had a much higher migratory propensity than larger benthivores. Hence, stream fishing specifically targets species and size groups that are less efficiently controlled with traditional lake fishing methods. As a rule of thumb, stream fishing is most efficient when water temperature is 2–6°C. Prior to implementing fish removals from streams, the potential evolutionary consequences of the targeted removal of migratory phenotypes should be considered. 

Place, publisher, year, edition, pages
Springer, 2019. Vol. 829, no 1, p. 205-216
Keywords [en]
Cost-effective, Cyprinid fishes, Evolutionary consequences, Fish removal, Migration
National Category
Ecology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-70585DOI: 10.1007/s10750-018-3832-4ISI: 000456178700015Scopus ID: 2-s2.0-85057100636OAI: oai:DiVA.org:kau-70585DiVA, id: diva2:1273066
Available from: 2018-12-20 Created: 2018-12-20 Last updated: 2019-04-04Bibliographically approved

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Nilsson, Per Anders

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  • apa
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