Interfemale variation in egg yolk androgen allocation in the European starling: do high-quality females invest more?

By K. Pilz, Henrik G. Smith, M. Sandell, H. Schwabl. 2003

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Female collared flycatchers adjust yolk testosterone to male age, but not to attractiveness (2005, background): “Other alternative explanations for the association of yolk testosterone with male age, such as phenotypic differences between females mated to young or older males (Groothuis and Schwabl, 2002; Pilz et al., 2003), are unlikely.”
Sex-specific patterns of yolk androgen allocation depend on maternal diet in the zebra finch (2005, background): “For example, levels of testosterone and DHT over the whole clutch were found to increase with perceived mate attractiveness in zebra finches (Gil et al., 1999) and with female quality (measured in terms of clutch size and laying date) in European starlings (Pilz et al., 2003).”
Chapter 7 Hormones in Avian Eggs: Physiology, Ecology and Behavior (2008, background): “For instance, increasing patterns have been found for red‐winged blackbirds, canaries, or European starlings (Lipar et al., 1999; Pilz et al., 2003; Tanvez et al., 2007), while decreasing trends are typical in zebra finches (Fig.”
Yolk testosterone organizes behavior and male plumage coloration in house sparrows (Passer domesticus) (2004, background): “…1991; McCormick 1998), birds (Schwabl 1993; Gil et al. 1999; Lipar et al. 1999; Sockman and Schwabl 2000; Reed and Vleck 2001; Whittingham and Schwabl 2002; Pilz et al. 2003), turtles (Janzen et al. 1998), reptiles (Conley et al. 1997; Bowden et al. 2000; Jennings et al. 2001; Lovern et al. 2001)].”