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Onolragchaa Ganbold,Richard P. Reading,Ganchimeg J. Wingard,백운기,Purevsuren Tsolmonjav,Ariunbold Jargalsaikhan,Otgontsetseg Khuderchuluun,John Azua 국립중앙과학관 2019 Journal of Asia-Pacific Biodiversity Vol.12 No.3
In normal sexual size dimorphism, males generally possess larger body sizes than females in vertebrates, especially birds, mammals, and some reptiles. However, most birds of prey from the orders Falconiformes and Strigiformes have reversed sexual dimorphism (RSD) in body size (i.e., females larger than males). We investigated the degree of RSD in lesser kestrels (Falco naumanni), a small falcon breeding in Mongolia, which may contribute to a better understanding of body size variation based on gender for other birds of prey that do not have plumage dimorphism. We explored the degree of RSD between male and female lesser kestrels in a semidesert region of Mongolia by capturing and measuring 79 males and 83 females during the breeding seasons of 2007 through 2016. Our 10 years of data showed that females were significantly larger than males in five of nine measurements, with an especially high degree of RSD in body weight and bill measurements. For males, we found significant relationships between body weight and both tail length and wingspan, but no significant relationships for females. Our results support previous hypotheses raised to explain RSD in birds of prey.
Ganbold, Onolragchaa,Reading, Richard P.,Wingard, Ganchimeg J.,Paek, Woon Kee,Tsolmonjav, Purevsuren,Jargalsaikhan, Ariunbold,Khuderchuluun, Otgontsetseg,Azua, John Elsevier 2019 Journal of Asia-Pacific biodiversity(Online) Vol.12 No.3
<P><B>Abstract</B></P> <P>In normal sexual size dimorphism, males generally possess larger body sizes than females in vertebrates, especially birds, mammals, and some reptiles. However, most birds of prey from the orders Falconiformes and Strigiformes have reversed sexual dimorphism (RSD) in body size (i.e., females larger than males). We investigated the degree of RSD in lesser kestrels (<I>Falco naumanni</I>), a small falcon breeding in Mongolia, which may contribute to a better understanding of body size variation based on gender for other birds of prey that do not have plumage dimorphism. We explored the degree of RSD between male and female lesser kestrels in a semidesert region of Mongolia by capturing and measuring 79 males and 83 females during the breeding seasons of 2007 through 2016. Our 10 years of data showed that females were significantly larger than males in five of nine measurements, with an especially high degree of RSD in body weight and bill measurements. For males, we found significant relationships between body weight and both tail length and wingspan, but no significant relationships for females. Our results support previous hypotheses raised to explain RSD in birds of prey.</P>
Richard P. Reading,John Azua,Travis Garrett,David Kenny,이한수,백운기,Nanette Reece,Purevsuren Tsolmonjav,Mary Jo Willis,Ganchimeg Wingard 국립중앙과학관 2020 Journal of Asia-Pacific Biodiversity Vol.13 No.2
We report on differential movement of adult and juvenile cinereous vultures (Aegypius monachus) in thenortheast Asia. Adult vultures remain in Mongolia throughout the year, whereas many juvenile vulturesmigrate from their breeding grounds in Mongolia to wintering grounds in the Republic of Korea (SouthKorea).We trapped adult and juvenile Cinereous Vultures in Mongolia and Korea to attach wing tags (n ¼270 fledglings and 10 adults) and, for some, global positioning system telemetry units (n ¼ 31 fledglings,18 juveniles, and 10 adults). While adult birds never left Mongolia, fledglings and juveniles wanderedmore widely into Russia (rarely), China, and the Korean Peninsula. Most telemetered fledglings andjuveniles for which we obtained data migrated seasonally between Mongolia and South Korea. Juvenilevultures used larger summer home ranges than adults. Juveniles used much smaller winter than summerhome ranges. Over the course of the year, adult and juvenile vultures moved similar amounts thatdiffered seasonally. How juvenile vultures learn the migration route between Mongolia and Republic ofKorea remains unknown. Our results have important conservation implications, as factors influencing thesurvivorship of migratory birds can strongly impact populations.