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首页> 外文期刊>Zoological Science >Sexual Differences in Post-hatching Saunders's Gulls: Size, Locomotor Activity, and Foraging Skill
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Sexual Differences in Post-hatching Saunders's Gulls: Size, Locomotor Activity, and Foraging Skill

机译：孵化后桑德海鸥的性别差异：大小，运动能力和觅食技巧

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摘要

Various selection pressures induce the degree and direction of sexual size dimorphism in animals. Selection favors either larger males for contests over mates or resources, or smaller males are favored for maneuverability; whereas larger females are favored for higher fecundity, or smaller females for earlier maturation for reproduction. In the genus of Larus (seagulls), adult males are generally known to be larger in size than adult females. However, the ontogeny of sexual size dimorphism is not well understood, compared to that in adults. The present study investigates the ontogeny of sexual size dimorphism in Saunders's gulls (Larus saundersi) in captivity. We artificially incubated fresh eggs collected in Incheon, South Korea, and measured body size, locomotor activity, and foraging skill in post-hatching chicks in captivity. Our results indicated that the sexual differences in size and locomotor activity occurred with the post-hatching development. Also, larger males exhibited greater foraging skills for food acquisition than smaller females at 200 days of age. Future studies should assess how the adaptive significance of the sexual size dimorphism in juveniles is linked with sexual divergence in survival rates, intrasexual contests, or parental effort in sexes.
机译：各种选择压力会诱发动物性大小二态性的程度和方向。选择有利于较大的雄性争夺同伴或资源，或者较小的雄性因可操作性而受青睐。而较大的雌性则倾向于较高的繁殖力，较小的雌性则倾向于较早的繁殖。在鸥属（海鸥）中，通常已知成年雄性比成年雌性更大。然而，与成年人相比，性大小二态性的个体发育还不很清楚。本研究调查了人工饲养桑德斯海鸥（Larus saundersi）中性大小二态性的个体。我们人工孵化了从韩国仁川收集的新鲜卵，并测量了圈养后孵化雏鸡的体型，运动能力和觅食技能。我们的结果表明，在孵化后的发育过程中发生了大小和运动能力的性别差异。同样，在200天龄时，较大的雄性比较小的雌性具有更大的觅食觅食技能。未来的研究应评估青少年中性大小双态性的适应性意义如何与生存率的性差异，性别内的竞争或父母的性工作联系起来。

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