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Some studies have indeed confirmed that females become less choosy with increased density and male-biased sex ratio (Rowe 1992; Lauer et al. Consequently, males’ reproductive success should be more evenly distributed.Additionally, one can expect variation in the effects of sex ratio and density on competition when there are changes in the relative competitive abilities of the individuals in the populations.

In a large number of animal species, individual performance is known to follow age-dependent patterns (Martin 1995; Gaillard et al. Typically, survival and reproductive success increase with age in younger individuals, subsequently decreasing as individuals get older (a phenomenon called senescence; Comfort 1979).

2008) and to alter both the opportunity for and the intensity of sexual selection.

The consequences of demographic parameters on sexual selection are, however, expected to vary with population-specific mating system (Emlen and Oring 1977; Kokko and Rankin 2006).

Here, we aimed to investigate the effects of population density and sex ratio on the intensity of competition within and between sexes and age classes.

We analyzed observational data from 16 seminatural populations of common lizards, , with varying male and female densities.




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