Survival Explains Sex Ratio in an Introduced Mandarin Duck Aix galericulata Population

Ardea

Wolfgang Mädlow¹  Jochen Bellebaum² 

[1] 2 In der Feldmark 7, 14476 Potsdam, Germany;1 Wiesenstraße 9, 16278 Angermünde, Germany

关键词: Waterbirds;   

DOI  :  

学科分类：动物科学

来源: Nederlandse Ornithologische Unie/Netherlands Ornithological Union

【 摘 要 】

Adultsexratioinducksismale-biased,probablyduetohighermortalityofincubatingfemales.InanintroducedpopulationofMandarinDucksAixgalericulatainBerlinandPotsdam,adultsexratio(proportionofmales)was0.65(95%confidenceinterval0.64–0.67).Annualapparentsurvivalof163colour-ringedbirdsduring2003–2012was0.65(0.55–0.76)forfirstyearand0.66(0.60–0.72)foradultmales,and0.47(0.25–0.69)forfirstyearand0.57(0.48–0.66)foradultfemales.Femalemortalitybutnotmalemortalitypeakedduringthebreedingseason.ALesliematrixmodelbasedonproductivityandsurvivalratesinthestudypopulationestimatedanadultsexratioof0.64,or0.67whenfirst-yearbirdswereexcluded.Thesimilaritybetweenobservedadultsexratioandmodelestimatesbasedonsurvivalsuggeststhatthemale-biasmightbefullyexplainedbysexdifferencesinsurvival.

【 授权许可】

Unknown