Filial Cannibalism by Male Fish as an Infanticide to Restart Courtship by Self-Regulating Androgen Levels
Filial Cannibalism by Male Fish as an Infanticide to Restart Courtship by Self-Regulating Androgen Levels
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雄鱼的孝顺同类相食作为杀婴行为，通过自我调节雄激素水平重新开始求爱
DOI：
10.1016/j.cub.2018.06.056
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发表时间：
2018
期刊：
影响因子：
9.2
通讯作者：
Takegaki Takeshi
中科院分区：
文献类型：
--
作者：
Matsumoto Yukio;Tateishi Tetsunari;Terada Ryusuke;Soyano Kiyoshi;Takegaki Takeshi
对于动物父母来说，父母的照顾是昂贵的[1-3]，他们经常遗弃，流产或杀死他们的后代，有时甚至吃掉他们-所谓的子相食[1，4]。子代同类相食的主要适应性假设集中在食用后代的预期营养益处上（基于能量的[EB]假设[5-7]）。然而，许多实证研究与EB假说不一致[8，9]。一个值得注意的例子是在某些鱼类中观察到的完全的子相食。这些物种的繁殖雄性吃掉所有的卵，并在照料少量卵时重新开始繁殖，正如EB假说所预测的那样;但是，这是令人困惑的，因为它们甚至可以在照料卵时向雌性求爱，并通过额外的交配增加卵。在这里，我们表明，育雏终止被称为总子相食在blenniid fishRhabdoblennius nitidusmale是一个内分泌的必要性，重新启动求爱行为，随后的交配。雄性表现出雄激素依赖性的育雏周期，并且它们通常不能在亲本阶段表现出求偶[10]。卵操纵实验表明，巢中的卵是调节雄性雄激素水平的关键刺激;它们不能重新开始求偶，直到移除所有的卵。此外，令人惊讶的是，鸡蛋有时会在没有被食用的情况下被吐出来，并且发生同类相食和取出所有鸡蛋与男性状况无关。这些结果强烈地表明，在该物种中，被认为是完全的子代同类相食的卵同类相食和移除行为是一种杀胚或杀胚行为，而不是同类相食，这有助于提高雄性的雄激素水平。
Parental care is costly for animal parents [1–3], who often desert, abort, or kill their offspring and sometimes even eat them—so-called filial cannibalism [1, 4]. A primary adaptive hypothesis for filial cannibalism centers on the expected nutritional benefits from eating offspring (the energy-based [EB] hypothesis [5–7]). However, many empirical studies are inconsistent with the EB hypothesis [8, 9]. 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 [10]. 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.
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作者：
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通讯作者：
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DOI：
10.1007/978-0-387-87458-6_8
发表时间：
2009
期刊：
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影响因子：
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作者：
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DOI：
--
发表时间：
2006
期刊：
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影响因子：
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作者：
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