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dc.contributor.authorHörnell-Willebrand, Maria
dc.contributor.authorWillebrand, Tomas
dc.contributor.authorSmith, Adam A.
dc.date.accessioned2014-03-04T13:24:32Z
dc.date.available2014-03-04T13:24:32Z
dc.date.issued2014
dc.identifier.citationHörnell-Willebrand, M., Willebrand, T. and Smith, A. A. (2014), Seasonal movements and dispersal patterns: Implications for recruitment and management of willow ptarmigan (Lagopus lagopus). The Journal of Wildlife Management, 78: 194–201. doi: 10.1002/jwmg.650nb_NO
dc.identifier.urihttp://hdl.handle.net/11250/191088
dc.description.abstractWe investigated the general patterns of movements in willow ptarmigan (Lagopus lagopus) populations. We analyzed data from 300 radiocollared willow ptarmigan from 3 study areas in the Swedish mountain range, and from 2 previous studies of recoveries of wing-tagged chicks from 3 areas in southern Norway. We found that 80% of juvenile females dispersed more than 5 km from their natal area, whereas only 25% of juvenile males established a summer range more than 5 km from the area where they were caught as chicks. Mean dispersal distances of juvenile females were 3 times longer (10.4 km) than those of juvenile males (2.4 km). Movement differences within sexes were not associated with apparent female breeding success or ptarmigan density in the natal area, and adult females migrated between wintering areas used as juveniles and their first breeding site. We found no differences in dispersal distances between the Norwegian and Swedish populations. Movements of adult and juvenile females during spring were similar in all respects. At scales of more than 5 km, the movements of juveniles and adult females play a role in redistributing birds within landscape units, and represent important inter-population movements. The results of this study explain the apparent contradiction between non-compensatory mortality based on data from radio-marked ptarmigan, and the almost complete compensation based on annual counts. Estimating the extent of immigration into areas with high local mortality is difficult because of predation or harvest under conditions of high, fixed emigration and immigration dependent on local conditions. This represents a problem if dispersal distances include areas that are considerably larger than the size of the study areanb_NO
dc.language.isoengnb_NO
dc.publisherWileynb_NO
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480nb_NO
dc.subjectLagopus lagopusnb_NO
dc.subjectdispersalnb_NO
dc.subjectptarmigannb_NO
dc.titleSeasonal movements and dispersal patterns: Implications for recruitment and management of willow ptarmigan (Lagopus lagopus)nb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.pagenumber194-201nb_NO
dc.source.volume78nb_NO
dc.source.journalJournal of Wildlife Managementnb_NO
dc.source.issue2nb_NO
dc.identifier.doi10.1002/jwmg.650
dc.identifier.doihttp://onlinelibrary.wiley.com/doi/10.1002/jwmg.650/abstract


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