Reproductive costs in two sex-role reversed pipefish species (Syngnathidae)
Reproductive costs in two sex-role reversed pipefish species (Syngnathidae)
复制标题
两种性别角色颠倒的尖嘴鱼（Syngnathidae）的繁殖成本
DOI：
--
复制
发表时间：
1988
期刊：
影响因子：
--
通讯作者：
I. Svensson
中科院分区：
文献类型：
--
作者：
I. Svensson
(1) 在两种海龙（Syngnathidae）中，比较了两种性别的繁殖成本，以了解它们如何影响性别角色逆转的模式。 (2) 在 Syngnathustyphle 中，雄性在育儿袋中育育后代，为它们提供营养和氧气。性别是单态的。与女性相比，男性因食物摄入量较低而面临生殖成本。此外，雄性比雌性生长得慢，这给未来的繁殖带来了成本，因为体型较大的雄性可以孵出更多的后代。没有发现捕食风险存在性别差异。雄性的越冬存活率可能会降低，因为它们的繁殖努力导致肠道脂肪沉积延迟。 (3) 在Nerophis ophidion中，雄性将其附着在其腹侧的后代孵化，并为它们提供营养和氧气。性别是二态性的，雌性体型更大，颜色更鲜艳。雄性在育雏时遭受捕食的风险增加。没有发现能源成本的迹象，例如通过减少食物摄入量或减慢生长速度。 (4) 这两个物种的繁殖成本不同，可能反映了育雏护理的差异。然而，在这两个物种中，限制性别的雄性比雌性面临更高的繁殖成本，正如性别角色颠倒的动物所预期的那样。
(1) In two species of pipefish (Syngnathidae) the reproductive costs of the two sexes were compared to see how they might influence patterns of sex-role reversal. (2) In Syngnathus typhle, males brood their offspring in a brood pouch, providing them with nutrients and oxygen. Sexes are monomorphic. Males faced reproductive costs in terms of a lower food intake compared with females. Also, males grew more slowly than females, which yields a cost to future reproduction, as larger males could brood more offspring. No sexual difference in predation risk was found. The over-winter survival of males was probably lowered because intestinal fat deposition was delayed as a result of their reproductive efforts. (3) In Nerophis ophidion, males brood their offspring attached to their ventral body side, and provide them with nutrients and oxygen. Sexes are dimorphic, females being larger and brighter in colour. Males suffered an increased predation risk when brooding. No indications of energetic costs were found, e.g. through a lowered food intake or a slower growth rate. (4) Reproductive costs differed in the two species, probably reflecting differences in brood care. However, in both species the limiting sex, males, faced higher reproductive costs than females, as would be expected in sex-role reversed animals.