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Conservation and management of large carnivores requires knowledge of female and male dispersal. This knowledge is challenging to obtain, often incomplete and contradictory at times. The size of the target population and the methods applied can bias the results. Also, population history and biological or environmental influences can affect dispersal on different scales within a study area. We tested for sex-specific substructure with individual-based Bayesian assignment tests and spatial autocorrelation analyses.
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Are sex steroids involved in the sexual growth dimorphism in Eurasian perch juveniles?

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Are sex steroids involved in the sexual growth dimorphism in Eurasian perch juveniles?

Timing of birth and food availability may select for biased offspring sex ratios when they differentially affect the reproductive value of male and female young. Here we show that early hatching date enhances more the probability of male Eurasian kestrels Falco tinnunculus to breed as one-year-old than that of females in a Finnish population. This rarely documented phenomenon has been previously observed in a kestrel population in the Netherlands. As kestrels in the Finnish population are migratory, our results refute the hypothesis that early-fledged males would have an advantage for early breeding only in resident populations.
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