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首页> 外文期刊>Current Biology: CB >Filial Cannibalism by Male Fish as an Infanticide to Restart Courtship by Self-Regulating Androgen Levels
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Filial Cannibalism by Male Fish as an Infanticide to Restart Courtship by Self-Regulating Androgen Levels

机译：男性鱼作为迷恋的孝联主义，通过自我调节雄激素水平重启求爱

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Parental care is costly for animal parents [], who often desert, abort, or kill their offspring and sometimes even eat them—so-called filial cannibalism []. A primary adaptive hypothesis for filial cannibalism centers on the expected nutritional benefits from eating offspring (the energy-based [EB] hypothesis []). However, many empirical studies are inconsistent with the EB hypothesis []. One notable case is total filial cannibalism observed in some fishes. The caregiving males of these species eat all eggs and restart reproduction when tending a small number of eggs, as predicted by the EB hypothesis; but, this is puzzling because they can potentially court females even while tending eggs and increase the eggs by additional matings. Here we show that brood termination known as total filial cannibalism in blenniid fishRhabdoblennius nitidusmales is an endocrinological necessity to restart courtship behavior for subsequent mating. Males exhibit androgen-dependent brood cycling, and they are normally incapable of exhibiting courtships during the parental phase []. Egg manipulation experiments demonstrated that egg presence in the nest is a key stimulus regulating male androgen levels; they cannot restart courtship until removing all eggs. Furthermore, surprisingly, eggs were sometimes spit out without being consumed, and the occurrence of cannibalization and removal of all eggs was not associated with male condition. These results strongly suggest that the egg cannibalistic and removal behaviors that have been regarded as total filial cannibalism in this species areinfanticideorembryociderather than cannibalism, which serve to increase the males’ androgen levels.
机译：动物父母的父母护理是昂贵的，谁经常沙漠，中止或杀死他们的后代，有时甚至吃它们所谓的孝联主义[]。用于饮食后期预期营养益处的初级适应性假设（基于能量为基于能量的[EB]假设[]）。然而，许多实证研究与EB假设不一致[]。一个值得注意的案例是在一些鱼类中观察到的总孝联。当EB假设预测时，这些物种的护理男性在抚育少量鸡蛋时吃了所有鸡蛋并重新开始繁殖;但是，这是令人费解的，因为它们即使在趋于鸡蛋并通过额外的花椰菜增加鸡蛋也可能潜在的女性。在这里，我们表明，被称为Blenniid FishRhaboboborennius NitidusMales的总孝联主义的托管终止是重启随后交配的求爱行为的内分泌必需品。雄性表现出雄激素依赖性育雏循环，它们通常无法在父母阶段进行求爱[]。蛋操作实验证明巢中的蛋存在是调节雄性雄激素水平的关键刺激;他们不能重启求爱，直到去除所有鸡蛋。此外，令人惊讶的是，鸡蛋有时吐出而不会被消耗，并且均匀的发生和除去所有卵的发生与男性条件无关。这些结果强烈建议，这种物种中被认为是总孝联主义的卵同类和去除行为都比同类的食指，这用于增加男性雄激素水平。

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