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dc.contributor.authorPepi, Adam A.
dc.contributor.authorVindstad, Ole Petter Laksforsmo
dc.contributor.authorEk, Malin
dc.contributor.authorJepsen, Jane Uhd
dc.coverage.spatialNorway, Norgenb_NO
dc.date.accessioned2017-10-03T11:12:31Z
dc.date.available2017-10-03T11:12:31Z
dc.date.created2017-04-06T13:22:52Z
dc.date.issued2017
dc.identifier.citationEcological Entomology. 2017, 42 (4), 430-438.nb_NO
dc.identifier.issn0307-6946
dc.identifier.urihttp://hdl.handle.net/11250/2458026
dc.description.abstract1. Population dynamics and interactions that vary over a species’ range are of particular importance in the context of latitudinal clines in biological diversity.Winter moth (Operophtera brumata) and autumnal moth (Epirrita autumnata) are two species of eruptive geometrids that vary widely in outbreak tendency over their range, which generally increases from south to north and with elevation. 2. The predation pressure on geometrid larvae and pupae over an elevational gradient was tested. The effects of background larval density and bird occupancy of monitoring nest boxes on predation rates were also tested. Predation on larvae was tested through exclusion treatments at 20 replicate stations over four elevations at one site, while pupae were set out to measure predation at two elevations at three sites. 3. Larval densities were reduced by bird predation at three lower elevations, but not at the highest elevation, and predation rates were 1.9 times higher at the lowest elevation than at the highest elevation. The rate of predation on larvae was not related to background larval density or nest box occupancy, although there were more eggs and chicks at the lowest elevation. Therewere no consistent differences in predation on pupae by elevation. 4. These results suggest that elevational variation in avian predation pressure on larvae may help to drive elevational differences in outbreak tendency, and that birds may play a more important role in geometrid population dynamics than the focus on invertebrate and soil predators of previous work would suggest. Ecosystem exploitation hypothesis, Fennoscandia, generalist predators, Norway, predator exclusion, pupal predation, top-down control.nb_NO
dc.language.isoengnb_NO
dc.subjectEcosystem exploitation hypothesisnb_NO
dc.subjectFennoscandianb_NO
dc.subjectgeneralist predatorsnb_NO
dc.subjectNorwaynb_NO
dc.subjectpredator exclusionnb_NO
dc.subjectpupal predationnb_NO
dc.subjecttop-down controlnb_NO
dc.titleElevationally biased avian predation as a contributor to the spatial distribution of geometrid moth outbreaks in sub-arctic mountain birch forestnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.subject.nsiVDP::Basale biofag: 470nb_NO
dc.subject.nsiVDP::Basic biosciences: 470nb_NO
dc.source.pagenumber430-438nb_NO
dc.source.volume42nb_NO
dc.source.journalEcological Entomologynb_NO
dc.source.issue4nb_NO
dc.identifier.doi10.1111/een.12400
dc.identifier.cristin1464088
dc.relation.projectNorges forskningsråd: 244454nb_NO
cristin.unitcode7511,4,0,0
cristin.unitnameTromsø
cristin.ispublishedtrue
cristin.fulltextoriginal
cristin.fulltextpostprint
cristin.qualitycode1


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