Subtle sexual plumage color dimorphism and size dimorphism in a South American colonial breeder, the Monk Parakeet(Myiopsitta monachus)  

作　　者：Macarena Morales Deysi J.Gigena Santiago MBenitez‑Vieyra Diego J.Valdez 

机构地区：[1]Facultad de Ciencias Exactas,Físicas y Naturales,Centro de Zoología Aplicada,Universidad Nacional de Córdoba,Rondeau 798,CP X5000AVP Córdoba,Argentina [2]Instituto de Diversidad y Ecología Animal(IDEA),Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Av.Vélez Sarsfield 299,X5000JJC Córdoba,Argentina [3]Departamento de Diversidad Biológica y Ecología,Facultad de Ciencias Exactas,Físicas y Naturales,Universidad Nacional de Córdoba,Av.Vélez Sarsfield 299,CP 5000 Córdoba,Argentina [4]Instituto Multidisciplinario de Biología Vegetal(IMBIV),Consejo Nacional de Investigaciones Científicas y Técnicas(CONICET),Av.Vélez Sarsfield 1666,CP X5016GCN Córdoba,Argentina

出　　处：《Avian Research》2020年第2期157-165,共9页鸟类学研究（英文版）

基　　金：the generous support of Córdoba Zoo。

摘　　要：Background:Parrots(Psittacidae Family)are one of the most colorful groups of birds in the world,their colors pro-duced both structurally and via unusual pigments(psittacofulvins).Most species are considered to be monogamous,and many have been viewed historically as sexually monomorphic and monochromatic.However,studies using morphometric analysis and spectrophotometric techniques have revealed sexual size dimorphism and also sexual plumage color dimorphism among some species.The Monk Parakeet(Myiopsitta monachus),a native parrot of South America,is an interesting species for the study of plumage coloration and size since it is considered sexually mono-chromatic and monomorphic.Furthermore,recent studies show that the Monk Parakeet has extra-bond paternity behavior and even breeding trios,which suggests that sexual selection may play an important role in this species,and that it might have sexually dimorphic plumage(albeit imperceptible by humans)and be dimorphic in size.Methods:For the determination of plumage color we used spectrophotometry in the range of avian vision(300-700 nm)and performed a morphological analysis.Results:Our spectrophotometric results indicate that the Monk Parakeet shows subtle sexual plumage color dimor-phism in three(crown,nape and wing)out of twelve body regions.Similarly,our morphometric analysis showed that there are subtle sex differences in body size(bill and weight).Conclusions:Although the Monk Parakeet shows extra-bond paternity and breeding trio behaviors which could increase sexual dimorphism,these behaviors occur among highly related individuals;perhaps the high rate of inbreeding is responsible for the attenuation of sexual plumage color dimorphism and sex differences in body size observed.

关 键 词：ARGENTINA Avian vision Colonial breeder Myiopsitta monachus PARROT Sexual plumage color dimorphism Sexual size dimorphism 

分 类 号：Q958[生物学—动物学]