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dc.contributor.authorBøhn, Thomas
dc.contributor.authorAmundsen, Per-Arne
dc.date.accessioned2019-03-11T13:53:03Z
dc.date.available2019-03-11T13:53:03Z
dc.date.issued2001-08-01
dc.description.abstractIntroduced species represent major threats to native and natural biodiversity. On the other hand, biologists may increase the understanding of ecological interactions by following communities during establishment of exotic species. Accordingly, feeding ecology and habitat use were studied in native whitefish (<i>Coregonus lavaretus</i>) and recently invading vendace (<i>C. albula</i>) in two lake localities situated 50 km apart within the subarctic Pasvik River system, northern Norway and Russia. Whitefish originally dominated the native fish communities of both lakes. The recent invasion and successive downstream expansion of vendace allowed comparisons between two sites: one in which the influence of the new potential competitor on the native fish species was weak, and one in which the influence was strong. In the downstream lake vendace was recorded for the first time at the time of the study, and only in small numbers, whereas in the upstream lake vendace had established a high population density and was the dominant fish species in the pelagic zone. No vertical segregation in pelagic habitat use was found between the two fish species in either lake. In the downstream lake both whitefish and vendace fed exclusively on zooplankton and had almost identical diets. In the upstream lake, in contrast, whitefish fed predominantly on zoobenthos and surface insects, while vendace fed mainly on zooplankton. Thus, the strong presence of vendace as a specialized planktivore reduced the availability of zooplankton as prey for the more generalist whitefish. The food segregation between the two fish species in the upstream lake was apparently interactive and caused by a strong asymmetrical competition for zooplankton, vendace being the superior species. The ecological consequences (including reduced zooplankton size and species diversity, alteration of the pelagic food web, and eutrofication as a possible cascading effect on the primary production) of the vendace invasion in the Pasvik watercourse are considerable, even after a few years, and are likely to proceed and intensify in the future.en_US
dc.description.sponsorshipThe Norwegian Research Council The Directorate for Nature Management The Governor of Finnmark Countyen_US
dc.descriptionThe following article, Bøhn, T. & Amundsen, P.-A. (2001). The competitive edge of an invading specialist. <i>Ecology, 82</i>(8), 2150-2163, can be accessed at <a href=https://esajournals.onlinelibrary.wiley.com/journal/19399170> https://esajournals.onlinelibrary.wiley.com/journal/19399170</a>. Copyright by the Ecological Society of America.en_US
dc.identifier.citationBøhn, T. & Amundsen, P.-A. (2001). The competitive edge of an invading specialist. <i>Ecology, 82</i>(8), 2150-2163.en_US
dc.identifier.cristinIDFRIDAID 352487
dc.identifier.issn0012-9658
dc.identifier.issn1939-9170
dc.identifier.urihttps://hdl.handle.net/10037/14937
dc.language.isoengen_US
dc.publisherEcological Society of Americaen_US
dc.relation.journalEcology
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920en_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480en_US
dc.subjectasymmetric competitionen_US
dc.subjectCoregonusen_US
dc.subjectdiet overlapen_US
dc.subjectfish invasionen_US
dc.subjectinteractive segregationen_US
dc.subjectinvasive speciesen_US
dc.subjectPasvik River system (northern Norway and Russia)en_US
dc.subjectpelagic zoneen_US
dc.subjectfeeding ecology and habitat useen_US
dc.subjectresource partitioningen_US
dc.subjectspecies invasionen_US
dc.titleThe competitive edge of an invading specialisten_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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