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Our results suggest that Rensch's rule is determined by a combination of sexual competition and male agility, and they are consistent with the following scenario. Rensch's rule in shorebirds and allies. Males have diverse displays ranging from ground displays to highly acrobatic aerial displays 9 , 14 , We used the social mating system as an imperfect surrogate of the intensity of sexual competition on a three-point scale: 1, polyandrous; 2, monogamous; 3, polygynous. For example, if small species live in resource-poor habitats, then resource limitation could prevent males of small species from responding to sexual selection for large size 6 , Second, shorebirds that breed near the equator may be more dimorphic than species breeding at higher latitudes.

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It is unlikely that life history traits and ecology confound the relationships between body size and SSD, because fecundity, migratory behavior, and habitat productivity are all unrelated to SSD.

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It is unlikely that life history traits and ecology confound the relationships between body size and SSD, because fecundity, migratory behavior, and habitat productivity are all unrelated to SSD. First, in acrobatic shorebirds, the frequency of energetically demanding song-flights by males correlates with the number of mates Northern lapwing; ref. Habitat productivity was scored by five observers blind to species names on a three-point scale: 0, desert and semidesert; 1, dry grassland and tundra, and dry forest; 2, wetland, marsh, seashore, lake, and river. Use of female size as the independent variable does not change our results qualitatively. In contrast, species with low intensity of male—male competition show female-biased dimorphism regardless of male agility Fig. Please review our privacy policy.

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