Migration Patterns of Adult and Juvenile Lesser Black-Backed Gulls Larus fuscus from Northern Norway

Ardea

Jan O. Bustnes²  Nils H. Lorentzen⁴  Morten Helberg¹  Geir H. Systad²  Ingve Birkeland³ 

[1] 1 Kleven 63, NO-4515 Mandai, Norway;2 Norwegian Institute for Nature Research, The Polar Environmental Centre, NO-9296 Tromsø, Norway;3 Farnes 10, NO-9300 Finnsnes, Norway;4 Bryne Ringvei 13, NO-4560 Vanse, Norway

关键词: Gulls;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

ToexploremigrationpatternsofLesserBlack-backedGullsLarusfuscusbreedinginnorthernNorway,thisstudypresentsresightingsof16adultand83juvenilebirdsmarkedinthisregion.Adultsoftheendangerednominatesub-speciesL.f.fuscushadalowprobabilityofbeingobserved(only3.5%ofmarkedbirdswereobserved),probablybecausetheadultswinterinareaswithfewobservers,suchaseasternandcentralAfrica.Incontrast,birdsofthegreyish-mantledsubspeciesL.f.intermediusorL.f.graellsiihadahighprobabilityofbeingobserved(45.5%).Adultsofintermedius/graellsiihadawesternmigrationrouteandwinteredmainlyinwesternEuropeandnorthwestAfrica,Adultsexhibitedahighsitefidelitytowinteringareas.Birdsmarkedasjuvenileshadtwodifferentmigrationroutes.(1)30%oftheobservedbirdscrossedtheScandinavianPeninsulatoFinlandandtheBalticcountries,andthenmigratedtotheeasternMediterranean(IsraelandEgypt)downtoeasternandcentralAfrica(KenyaandCameroon).(2)Theother70%followedtheEuropeancoastandoverwinteredinUK,theIberianPeninsula,Morocco,MauritaniaandSenegal.Therewerenoindicationsthatjuvenilemigrationpatternsdifferedamongsubspeciesasjuvenilesfrommixedandpurefuscuscoloniesexhibitedsimilarpatterns.Theapparentdifferencesinmigrationpatternsbetweenadultandjuvenilefuscusmaybearesultofjuvenileexploratorymigration.

【 授权许可】

Unknown