Mate choice for body size leads to size assortative mating in the Ryukyu Scops Owl Otus elegans

Understanding evolutionary phenomena that involve size assortative mating, requires elucidating the generating mechanisms on which assortment is based. Although various mechanisms have been suggested, their relative importance may differ across taxonomic groups. Males selecting for large, fecund females combined with the dominance of large males in the competition for females, has been suggested as a major mechanism in specific groups. However, raptors do not appear to conform to this, because the selection for smallness among males (assumed in a theory of reversed sexual size dimorphism) and the selection for largeness among males (assumed in the theory of size assortative mating) are in opposite directions. We studied the assortative mating during a long-term study of the Ryukyu Scops Owls Otus elegans interpositus. Significant assortative mating was found for culmen length (from the base to the tip of the bill) and wing length (from the bend of the wing to the tip of the longest prim..., This dataset was collected during a long-term study of the Ryukyu Scops Owls Otus elegans on Minami-daito Island, Japan., Statistical software R and statisitical progamming language Stan are required for opening the files in this dataset and for reproducing the analyses in the paper.
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