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Sex allocation
Sex allocation is the apportioning of parental resources to male versus female offspring in a sexually reproducing species. Sex allocation theory assumes that natural selection favours parents thatExpand
The evolution of mutual ornamentation
There is good evidence that mutual ornaments can have a signal function in both sexes, and social status signalling is especially likely to be important, because competition over nonsexual resources is more balanced between the sexes than sexual competition. Expand
Extreme adaptive modification in sex ratio of the Seychelles warbler's eggs
It is shown that biased hatching sex ratios are caused by biased production and not by differential embryo mortality, and that unhelped breeding pairs on low-quality territories produce 77% sons, whereas unhelping pairs on high- quality territories produce 13% sons. Expand
Importance of habitat saturation and territory quality for evolution of cooperative breeding in the Seychelles warbler
Habitat saturation and territory quality are both involved in the evolution of cooperative breeding, and the results support the 'benefits of philopatry,5,6 hypothesis, which emphasizes the lifetime inclusive fitness benefits from staying at home. Expand
Ecological constraints, life history traits and the evolution of cooperative breeding
It is suggested that to identify the key differences between cooperative and noncooperative species, a broad constraints hypothesis that incorporates ecological and life history traits in a single measure of 'turnover of breeding opportunities' may provide the most promising avenue for future comparative studies. Expand
Parentage assignment and extra‐group paternity in a cooperative breeder: the Seychelles warbler (Acrocephalus sechellensis)
Parentage analyses showed that subordinate ‘helper’ females as well as the dominant ‘primary” females laid eggs in communal nests, indicating that the Seychelles warbler has an intermediate level of female reproductive skew, in between the alternative extremes of helper‐at‐the‐nest and joint nesting systems. Expand
Green nesting material has a function in mate attraction in the European starling
Experimental evidence that males use green plant material to attract mates is found, and removal of greenery resulted in a significantly lower percentage of nestboxes containing a clutch than the control or addition treatment. Expand
Inclusive fitness theory and eusociality
It is argued that inclusive fitness theory has been of little value in explained the natural world, and that it has led to negligible progress in explaining the evolution of eusociality, but these arguments are based upon a misunderstanding of evolutionary theory and a misrepresentation of the empirical literature. Expand
Low-frequency songs lose their potency in noisy urban conditions
It is experimentally shown that urban noise conditions impair male–female communication and that signal efficiency depends on song frequency in the presence of noise, and that low-frequency songs by males are related to female fertility as well as sexual fidelity. Expand