Breeding of Non-Adults and Effects of Age on Productivity in the Spanish Imperial Eagle Aquila adalberti

Ardea

Santi Mañosa⁴  Luis Mariano González²  Enric Ortega⁴  Javier Oria¹  Roberto Sánchez³  Antoni Margalida⁵ 

[1] 5 Boscaje S.L., c/San Agustín 22, E-40001 Segovia, Spain;3 Dirección General para la Biodiversidad, Ministerio de Medio Ambiente, c/ Ríos Rosas 24, 28003, Madrid, Spain;4 TRAGSA-División Servicios Medioambientales, c/ Velázquez, 36 Madrid;2 Departament de Biologia Animal, Universitat de Barcelona. Facultat de Biologia, Avinguda Diagonal, 645. E-08028 Barcelona, Spain;1 Bearded Vulture Study & Protection Group, Apdo. 43, E-25520 El Pont de Suert, Lleida, Spain

关键词: Territory Quality;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Westudiedannualandgeographicalvariationintheproportionofbreedingnon-adult(lt;4.5yearsold)SpanishImperialEaglesAquilaadalbertiinrelationtothespecies'recentdemographicrecovery.Theproportionofnon-adultbreedersinthepopulationsstudiedincreasedsignificantlyduring1983–2004inparallelwiththepopulationincrease.Non-adultpairsweremoreoftenassociatedwith‘young’territories(occupiedrecently)thanwithterritoriesthathadalreadybeenoccupiedforlongertime(mostlyusedbyadultpairs).Adultpairsproducedsignificantlymorechicksthanmixedadult—non-adultpairs,whichinturnhadahigherproductivitythanpairsinwhichbothmaleandfemalewerenon-adult.Adultpairsattemptedbreedingmoreoftenthannon-adultpairs,andclutchandbroodsizewerelarger.Thepoorestreproductiveoutputwasfoundinpairswithnon-adultmales.Thesedifferenceswerenotassociatedwithdifferencesinfledgingrates.Oncetheinfluenceofterritorieswascontrolledfor(comparingtheproductivitybetweenadultpairsandnon-adultpairspresentinthesameterritory)theageeffectonproductivitywassignificant.Ourresultsemphasisetheimportantrolewhichtherecruitmentofnon-adultbirdsintothebreedingpopulationmayhaveplayedintherecentpopulationrecoveryoftheSpanishImperialEagle.

【 授权许可】

Unknown