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dc.contributor.authorAmundsen, Per-Arne
dc.contributor.authorPrimicerio, Raul
dc.contributor.authorSmalås, Aslak
dc.contributor.authorHenriksen, Eirik Haugstvedt
dc.contributor.authorKnudsen, Rune
dc.contributor.authorKristoffersen, Roar
dc.contributor.authorKlemetsen, Anders
dc.date.accessioned2019-11-12T21:13:32Z
dc.date.available2019-11-12T21:13:32Z
dc.date.issued2018-08-15
dc.description.abstractWe review three long‐term research programs performed over the last four decades on the ecology and management of oligotrophic lake systems with different fish communities at 69&deg; N in Norway. Through whole‐lake perturbation experiments, intensive culling of stunted fish removed 35 tons (1984–1991) of Arctic charr <i>Salvelinus alpinus</i> in Takvatn (15 km<sup>2</sup>) and 153 tons (1981–1983, 2002–2004) of European whitefish <i>Coregonus lavaretus</i> in Stuorajavri (25 km<sup>2</sup>). In Takvatn, the overcrowded charr population decreased to 20% of the initial abundance, whereas brown trout <i>Salmo trutta</i> abundance increased. Somatic growth improved strongly in both species. In charr, ontogenetic habitat shifts broke down, the diet changed to more benthos, and plankton‐borne parasites decreased. High abundance of juvenile, littoral charr provided new prey for trout, creating an alternative, predator‐regulated stable state. Similar density reductions, positive effects on growth and reduced parasite loads occurred in whitefish in Stuorajavri. Despite the heavy culling, however, a new stable state did not occur and the fish community returned to the pre‐culling situation. In the Pasvik watercourse, vendace <i>Coregonus albula</i> invaded around 1990 after an upstream introduction. The population of this non‐native, highly specialized planktivore increased rapidly, resulting in steep density declines in zooplankton and the native planktivorous whitefish morph, and large changes in energy flow and structure and dynamics of the lacustrine food web. These programs show that long‐term research is essential for understanding the ecology of manmade disturbances and providing a scientific basis for management efforts.en_US
dc.descriptionSource at <a href=https://doi.org/10.1002/lno.10951>https://doi.org/10.1002/lno.10951</a>.en_US
dc.identifier.citationAmundsen, P.-A., Primicerio, R., Smalås, A., Henriksen, E.H., Knudsen, R., Kristoffersen, R. & Klemetsen, A. (2018). Long-term ecological studies in northern lakes – challenges, experiences and accomplishments. <i>Limnology and Oceanography, 64</i>(S1), S11-S21. https://doi.org/10.1002/lno.10951en_US
dc.identifier.cristinIDFRIDAID 1653286
dc.identifier.doi10.1002/lno.10951
dc.identifier.issn0024-3590
dc.identifier.issn1939-5590
dc.identifier.urihttps://hdl.handle.net/10037/16658
dc.language.isoengen_US
dc.publisherAssociation for the Sciences of Limnology and Oceanographyen_US
dc.publisherWileyen_US
dc.relation.journalLimnology and Oceanography
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRIMEDBIO/186320/Norway/Incipient speciation through ecological divergence in subarctic whitefish populations//en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/MILJØ2015/183984/Norway/VANN: Long-term effects of a biological invasion/VANN/en_US
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRIMEDBIO/213610/Norway/The role of parasites in food-web topology and dynamics of subarctic lakes//en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Limnology: 498en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Limnologi: 498en_US
dc.titleLong-term ecological studies in northern lakes – challenges, experiences, and accomplishmentsen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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