Assessing the Role of Multiple Environmental Factors on Eurasian Spoonbill Departure Decisions from Stopover Sites

Ardea

José A. Masero³  Germán Orizaola¹  Juan M. Sánchez-Guzmán³  Otto Overdijk²  Juan G. Navedo³ 

[1] 3 Population and Conservation Biology, Department of Ecology and Evolution, Evolutionary Biology Centre, Uppsala University, Norbyvägen 18D, 75236 Uppsala, Sweden;2 Natuurmonumenten, Knuppeldam 4, 9166 Schiermonnikoog, The Netherlands;1 Conservation Biology Research Group, Área de Zoología, Facultad de Ciencias, Universidad de Extremadura, Avda. Elvas s/n, 06071 Badajoz, Spain

关键词: Wind Assistance;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Understandingthefactorsdrivingdeparturedecisionsfromstopoversitesiscriticalwhenpredictingthedynamicsofbirdmigration.WeInvestigatedtheInteractiveeffectsofwind,tidalcharacteristics,andprecipitationonthedeparturedecisionsoftheEurasianSpoonbillPlataleal.leucorodiafromamajorcoastalstopoverlocalityinnorthernIberia.MostdepartingSpoonbills(gt;80%)crossedanadjacentmountainrangetofollowadirectrouteoverInlandIberia,whiletheremaindermadeadetourfollowinganIndirectcoastalroutealongthecoastoftheIberianPeninsula.Duringfourconsecutiveautumns,wedailymonitoreddepartingSpoonbillsleavingalongthesetworoutes.ThebirdstakingtheInlandroute,crossingunsuitablehabitatsandneedingthereforehigherfuel-loads,departedpreferentiallyunderfavourabletailwindconditions(TWC).Thisrepresentedasignificantincreaseindistancecoveredand/oradecreaseinenergyspentperunittime.Moreover,Spoonbillstakingtheinlandrouteoftendepartedduringspringtides.Fortheindirectcoastalroute,TWCdidnotaffecttheonsetofmigrationbutbirddeparturesincreasedwithneaptides.Precipitationanddatewerenegativelycorrelatedwithdeparturestowardsbothroutes,whereasSpoonbilldensityatthestopoverhadapositiveeffect.OurfindingsprovideempiricalsupportfortherolethatwindassistancemayplayforSpoonbillstoresumemigration.

【 授权许可】

Unknown