Sex ratio variation in birds

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Primary sex ratio adjustment to experimentally reduced male UV attractiveness in blue tits (2006, background): “two experimental studies in other bird species in which some aspect of male attractiveness was manipulated have found an effect on primary sex ratio such as predicted by the Trivers and Willard (1973) hypothesis (collared flycatcher [Ficedula albicollis], Ellegren et al.”
Systematic bias in estimates of reproductive potential of an Atlantic cod (Gadus morhua) stock: implications for stock–recruit theory and management (2006, background): “In some populations, variability in sex ratios is an adaptive response that matches the proportional abundance of males and females to current and expected fitness payoffs (Trivers and Willard 1973; Clutton-Brock 1986).”
Manipulation of primary sex-ratio: an updated review (2006, background): “Although it seems evident that avian sex ratio manipulation exists, some authors still maintain that it could have not evolved in birds, or at least, would not be widespread in avian taxa (Clutton-Brock, 1986; Krackow, 1999; Palmer, 2000).”