Environmental‐ and parental condition‐related variation in sex ratio of kestrel broods

By E. Korpimäki, C. A. May, D. Parkin, J. Wetton, Jürgen Wiehn. 2000

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Impacts of flight distance on sex ratio and resource allocation to offspring in the leafcutter bee, Megachile rotundata (2006, background): “Birds have been shown to alter resource allocation based on sex (Boulet et al. 2001), and malebiased (the smaller sex) fledging sex ratios have been reported for birds nesting in areas with low food availability or with poor maternal condition (Korpimäki et al. 2000).”
Size-mediated dominance and begging behaviour in Eurasian kestrel broods (2003, result): “This latter idea is not in accordance with previous studies in our kestrel population, however, where pairs breeding in years of low food supply and females with a poorer body condition tended to produce male-biased fledging sex ratios (Korpimäki et al., 2000).”
A melanin-based trait reflects environmental growth conditions of nestling male Eurasian kestrels (2007, methodology): “Broods containing only male or female chicks have been commonly recorded each breeding season in our population study (Korpimäki et al. 2000).”
Primary sex ratio adjustment to experimentally reduced male UV attractiveness in blue tits (2006, background): “…ratio among individual broods has more often been encountered in birds, but most studies lack convincing biological explanations for such year effects (Lessells et al. 1996, Hartley et al. 1999; Korpimäki et al. 2000; Radford and Blakey 2000; Griffith et al. 2003; CM Lessells, unpublished data).”