Reproductive Ecology of the Upland Buzzard (Buteo hemilasius) on the Mongolian Steppe

Sibling competition affects body condition and allostatic load in the colonial nesting lesser kestrel Falco naumanni

“…Thus, the dominant sibling had a higher body condition index than the subordinate siblings with the latter predicted to have an increased allostatic load. Similar results were found in other studies on the similar-sized American kestrel (Falco sparverius; Negro et al 1994) and common kestrel (Dijkstra et al 1990) as well as the common buzzard in Hungary (Buteo buteo; Fehervari et al 2014) and the upland buzzard in Mongolia (Buteo hemilasius; Gombobaatar et al 2010).…”

Nesting ecology of solitary‐nesting Amur Falcons ( Falco amurensis ) in central Mongolia

“…Several of these covariates have been found to be important for other Mongolian raptors (Gombobaatar et al. , ). All covariates were scaled to have a mean of zero and a standard deviation of one.…”

Sibling Competition Induces Stress Independent of Nutritional Status in Broods of Upland Buzzards

“…Growth bars are the dark and light bands on the vane that are produced during the day and night, respectively, such that each pair of bars represents 24 hr of feather growth. Growth bars show a direct relationship with nutritional condition (Hill and Montgomerie 1994, Yosef 1997, Carrascal et al 1998, Jenkins et al 2001, territory quality (Yosef andGrubb 1992, Stratford andStouffer 2001), plumage color (Hill and Montgomerie 1994), reproductive effort and social dominance (White et al 1991, Grubb et al 1998, biometry (Polo and Carrascal 1999), habitat quality and choice (Hogstad 1992, Grubb and Yosef 1994, Yosef 1997, Carlson 1998, susceptibility to stress (Machmer et al 1992, Yosef and Grubb 1992, Bortolotti et al 2002, Gombobaatar et al 2009, flocking vs. floaters Cimprich 1990, Hogstad 2003), and caching or supplemental feeding (Grubb and Cimprich 1990, Waite 1990, Brodin and Ekman 1994.…”

“…In a recent study of the Upland Buzzard (Buteo hemilasius), Gombobaatar et al (2009), used ptilochronology to evaluate the relative nutritional condition of nestlings and showed that inter-sibling rivalry resulted in reduced nutritional condition of the younger siblings but not in the number of young in the brood. However, they were unable to explain why the number of fault bars, an indicator of exposure to stressors, was greater in broods in areas of high prey density irrespective of brood size.…”

“…In this study, we measured the amount of immunoreactive CORT deposited in feathers of nestling Upland Buzzards (the same individuals measured in Gombobaatar et al 2009), as an historical record of each nestling's HPA activity during the weeks of feather growth in the nest. These measurements integrate different aspects of HPA activity, including the frequency and magnitude of response to stressors and, to a lesser degree, variation in baseline levels (see Bortolotti et al 2008Bortolotti et al , 2009a.…”