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首页> 外文期刊>Ethology >Male Ornamentation in a Sex-Role Reversed Pipefish Corythoichthys haematopterus
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Male Ornamentation in a Sex-Role Reversed Pipefish Corythoichthys haematopterus

机译：在性角色颠倒的Pipe鱼Corythoichthys haematopterus中的雄性装饰。

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Sexual selection theory predicts that mating competition in sex-role reversed animals acts more strongly on females than males and consequently females are expected to develop secondary sexual traits. However, in a sex-role reversed pipefish Corythoichthys haematopterus (family: Syngnathidae), only males develop an ornamental trait on the thorax, consisting of approx. 3-5 speckles alternated by lateral stripes of brilliant light blue and orange. To understand the function of this male ornament, we examined whether the presence of females affects the expression of this trait, and whether the expression of this trait depends on the male's physical condition. Individual males were reared in a tank for a month in four different conditions: in high or low food supply and in the presence or absence of a female. After 1 mo, males in better condition expressed larger and deeper blue and yellow speckles, and males maintained with a female expressed larger and deeper blue speckles than solely reared males. These results indicated that the male ornament functions as a signal conveying information on the phenotypic quality of its holder and that females are potential receivers of this signal. Because C. haematopterus exhibits strict monogamy and competition for a mate occurs only among females, we concluded that the male ornament is not displayed in the context of mating competition but rather it is used as a cue for partner recognition to maintain pair bond.
机译：性选择理论预测，在逆转性角色的动物中，交配竞争对雌性的作用比对雄性的作用更大，因此，预期雌性会发展出次要性特征。然而，在性角色颠倒的pipe鱼（Corythoichthys haematopterus）（家族：Syngnathidae）中，只有雄性才在胸上形成一种装饰性特征，大约由大约15％组成。 3-5个斑点由明亮的浅蓝色和橙色的侧条纹交替出现。为了了解这种男性装饰物的功能，我们检查了女性的存在是否会影响该特征的表达，以及该特征的表达是否取决于男性的身体状况。在四种不同的条件下，雄性个体在水箱中养育一个月：食物供应高或低，以及有无雌性。 1个月后，状况较好的雄性比单独饲养的雄性表现出更大和更深的蓝色和黄色斑点，雄性维持，雌性则表现出更大和更深的蓝色斑点。这些结果表明，雄性装饰物作为信号传递有关其持有人表型质量的信息，而雌性装饰物是该信号的潜在接收者。由于直翅目昆虫表现出严格的一夫一妻制，并且竞争只发生在雌性中，因此我们得出结论，雄性饰物不是在交配竞争的情况下展示的，而是被用作伴侣识别以保持配对的线索。

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