Claire abbott tits8/4/2023 ![]() ![]() ![]() In particular, in animal species with separate sexes, measuring the direction and force of intra‐ and intersexual selection requires collecting information on difficult‐to‐quantify behaviors from large numbers of individuals. Studying sexual selection in the wild poses several methodological challenges. They also call for studying the potential role of assortative mating in local adaptation and evolution of ornaments in both sexes. Our results therefore underscore that long‐term studies are needed to draw broad conclusions about mating patterns in natural populations. It also showed that mating patterns differed among populations and especially between two neighboring populations that displayed phenotypic divergence. It revealed that assortative mating was moderately positive for both ornaments. To determine whether there was nonetheless a general trend in the data, we ran a within‐study meta‐analysis. Based on data for 1,657 pairs of birds, we found large interannual variation: assortative mating varied from positive to negative. We focused on two plumage ornaments-the blue crown and the yellow breast patch. Here, we characterized assortative mating patterns over 10 years in four populations of the blue tit ( Cyanistes caeruleus), a passerine bird. However, assortative mating studies frequently base their conclusions on small numbers of individuals sampled over short periods of time and limited spatial scales even though spatiotemporal variation is common. Assortative mating is a potential outcome of sexual selection, and estimating its level is important to better understand local adaptation and underlying trait evolution. ![]()
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