期刊论文详细信息
Ardea
Breeding of Non-Adults and Effects of Age on Productivity in the Spanish Imperial Eagle Aquila adalberti
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
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【 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.

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