Offspring sex ratio variation in relation to brood sizeand mortality in a promiscuous species: the AquaticWarblerAcrocephalus paludicola

We analyse nestling sex ratio variation in the Aquatic WarblerAcrocephalus paludicolato testfor predictions from sex allocation theory that the brood sex ratio is close to parity. We alsotested Fiala’s (1980) prediction that there is no difference in sex ratio between broodsaffected and not affected by mortality, and whether a shift in primary sex ratios or simpledifferential mortality by sex underlies that difference.

ANDRZEJ DYRCZ et al, Ibis (2004),146, 269-280