Ardea | |
Fine-Scaled Orientation Changes in Migrating Shorebirds | |
Martin Green1  Thomas Alerstam1  Johanna Grönroos1  | |
[1] 1 Department of Biology, Lund University, Ecology Building, SE-223 62 Lund, Sweden | |
关键词: Ring Recoveries; | |
DOI : | |
学科分类:动物科学 | |
来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union | |
【 摘 要 】
Flightdirectionsandroutesofmigratingbirdsaredeterminedbythebirds'compassorientation,butalsobyeffectsofwind,socialinfluence,responsestotopographyandlandmarks,andtonavigationcues.WeinvestigatedtheorientationandroutestakenbyarcticshorebirdsduringautumnmigrationinsouthernSwedenatthreedifferentsitessituatedwithinadistanceof200kmfromeachother,inrelationtothebirds'destinations.Weusedthreedifferentmethods,visualtelescopeobservations,trackingradarregistrationandringrecoveries.Meantrackdirectionsdifferedsignificantlybetweenthedifferentsitesinawaythatdemonstratedfine-scaledorientationchangeswhentheshorebirdspassedthesouthernBalticregion.Thegradualchangecannotbeexplainedbydifferentwindconditionsatthedifferentsitesorbydistinctresponsestospecifictopographicalfeatures,i.e.thebirdswerenotfollowingcoastlinesorprominentlandmarksinanydetailedway.Neithercoulditbereconciledwithorientationaccordingtoanyofthemaincompassmechanismsknowntobeusedbymigratingbirdswhichindicatesthatthecontrolofflightcoursesandpathsmaybemorecomplexthanexpected.Theshorebirdsmighttravelwithinaslightlywindingflightcorridorinbroadagreementwiththelarge-scaletopographytomaximizegeneralassociationwithcoastalhabitatsduringmigration.Juvenilebirdshadasignificantlydifferentorientationthanadults,particularlywhenthejuvenilestravelledinflockswithoutanyadults.Juvenilebirdsmaylearnthegeneralflightpathsandcoursechangesinrelationtothelarge-scaletopographyfromolderandexperiencedindividualsintheflocks,butmostofthislearningprocessbetweengenerationsprobablydoesnottakeplaceuntilafterthebirds'firstautumnmigration.
【 授权许可】
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【 预 览 】
Files | Size | Format | View |
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RO201912090719636ZK.pdf | 75KB | download |