Latitudinal variation and coevolutionary diversification of sexually dimorphic traits in the false blister beetle Oedemera sexualis

Daisuke Satomi, Chiharu Koshio, Haruki Tatsuta, Shin ichi Kudo, Yasuoki Takami

研究成果: ジャーナルへの寄稿学術誌査読

4 被引用数 (Scopus)

抄録

Sexual traits are subject to evolutionary forces that maximize reproductive benefits and minimize survival costs, both of which can depend on environmental conditions. Latitude explains substantial variation in environmental conditions. However, little is known about the relationship between sexual trait variation and latitude, although body size often correlates with latitude. We examined latitudinal variation in male and female sexual traits in 22 populations of the false blister beetle Oedemera sexualis in the Japanese Archipelago. Males possess massive hind legs that function as a female-grasping apparatus, while females possess slender hind legs that are used to dislodge mounting males. Morphometric analyses revealed that male and female body size (elytron length), length and width of the hind femur and tibia, and allometric slopes of these four hind leg dimensions differed significantly among populations. Of these, three traits showed latitudinal variation, namely, male hind femur was stouter; female hind tibia was slenderer, and female body was smaller at lower latitudes than at higher latitudes. Hind leg sizes and shapes, as measured by principal component analysis of these four hind leg dimensions in each sex, covaried significantly between sexes, suggesting coevolutionary diversification in sexual traits. Covariation between sexes was weaker when variation in these traits with latitude was removed. These results suggest that coevolutionary diversification between male and female sexual traits is mediated by environmental conditions that vary with latitude.

本文言語英語
ページ(範囲)4949-4957
ページ数9
ジャーナルEcology and Evolution
9
8
DOI
出版ステータス出版済み - 4月 2019
外部発表はい

!!!All Science Journal Classification (ASJC) codes

  • 生態、進化、行動および分類学
  • 生態学
  • 自然保全および景観保全

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