Spring Passage of Willow Warbler Phylloscopus trochilus Across the Western Mediterranean: Comparing Islands with the Mainland
[摘要] SpringmigrationofWillowWarblerPhylloscopustrochilusoverthewesternMediterraneanwasstudiedusingobservationscollectedataringingstationonthemainlandofSpain(Aiguamollsdel'Empordà ),andatanislandstation(Cabrera,oneoftheBalearics).Duringtheyears1993–2001,birdswerecaughtandmeasuredbetween16Apriland15May.Thepeakofcapturesandmeanarrivaldatewassevendaysearlieronthecontinentalstationthanontheisland.Atbothstationslong-wingedindividualspassedbeforeshort-wingedbirds,andbirdsatthecontinentalstationhadlongerwingsthanattheisland.Thenumberofrecaptureswaslowatbothlocationssuggestingthatmostbirdsdepartedatthedayofarrival.Themeanstopoverperiodforrecapturedindividualsatthecontinentalandislandstationwas2.2and2.6days,respectively.Bodymassremainedmoreorlessconstantduringthisstay.OurobservationssuggestthatsubpopulationsofWillowWarblers,differingbothinmorphologyandtimingofmigration,havedifferentmigrationroutesoverthewesternMediterranean;onemigratesovertheIberianPeninsulaandanothercrossesoverthesea.
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[效力级别] [学科分类] 动物科学
[关键词] Subpopulations [时效性]
