Connectivity and Age Distribution of the Baltic Common Guillemot Uria aalge Population: Evidence from Morphometry and Ringing Recoveries

Ardea

Sven Blomqvist²  Mats Peterz¹ 

[1] 1 Avenue Félix-Cornu 36, CH-1802 Corseaux, Switzerland;2 Dept Systems Ecology, Stockholm University, SE-106 91 Stockholm, Sweden

关键词: Baltic Sea;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Inevolutionaryecology,environmentalmonitoringandconservationmanagement,reliableinformationonphenotypicanddemographictraitsinmarineseabirdsishighlywanted,butdifficulttoacquire.Therefore,freshlydeadCommonGuillemotsUriaaalge(n=149)incidentallydrownedinsalmondriftgillnetsintheBalticSea,duringOctober—November,werestudied.Wenotedage,sex,moultpatternandfatstatus,andtookmorphometricmeasurementstocomparewithdatafromtheNortheastAtlanticpopulation.Onlyminorphenotypicdifferenceswerefound.Thebirdshadslightlylongerwingsthanexpectedatthelatitudewheretheywerecollected,probablyduetotheirnewlygrownprimariesand/orobserverdifferences,ratherthanageneticdivergence.TheBalticGuillemotappearsnottobeadistinctsubspecies,butonlythemarginalmemberofademe.RingingrecoveriesalsosuggestintermittentexchangeofbirdsbetweentheBalticandtheNorthSea.Youngbirdsdidnotseemtobeover-representedingillnetbycatches.Ourfoundagedistribution—withaheavydominanceofadultbirds,butfewimmature/juveniles—deviatedfromthatreportedearlier,andsuggeststhatthepopulationismorevulnerabletoadultmortalitythroughbycatchingillnetsthanpreviouslybelieved.

【 授权许可】

Unknown