Early Filial Cannibalism in Fish Revisited: Endocrinological Constraint, Costs of Parental Care, and Mating Possibility
Early Filial Cannibalism in Fish Revisited: Endocrinological Constraint, Costs of Parental Care, and Mating Possibility
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DOI：
10.1086/724284
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发表时间：
2023-06-01
影响因子：
2.9
通讯作者：
Amiya，Noriko
中科院分区：
文献类型：
--
作者：
Takegaki，Takeshi;Nakatake，Yosuke;Amiya，Noriko
父母遗弃子女通常发生在父母照顾的早期阶段，这被认为可以最大限度地减少遗弃前父母照顾的成本。本研究调查了内分泌限制对雄性Rhabdoblennius nitidus 早期全子同类同类相食的影响，Rhabdoblennius nitidus 是一种具有雄激素依赖性育雏周期的父系育雏鲽鱼。在育雏减少实验中，与非食人者相比，食人雄性的血浆 11-酮睾酮 (11-KT) 水平较低，并且在亲代照顾阶段也与雄性相似，11-KT 水平也相似。由于 11-KT 调节雄性求爱强度，求爱活动减少的雄性会表现出完全的孝顺同类相食行为。然而，在父母照顾的早期阶段，11-KT 水平的短暂升高可能会延迟子女同类相食的时间。相比之下，在 11-KT 水平下降到最低水平之前，可能会发生完全的孝顺同类相食行为，此时雄性可能仍然能够表现出求爱行为，这可能会减少父母照顾的成本。为了了解雄性有多少以及何时表现出交配和养育行为，重要的是不仅要考虑内分泌限制的存在，还要考虑其强度和灵活性。
Offspring desertion by parents generally occurs at an early stage of parental care, which is thought to minimize the costs of parental care prior to desertion. This study investigated the effects of endocrinological constraints on early total filial cannibalism by maleRhabdoblennius nitidusin the field, a paternal brooding blennid fish with androgen-dependent brood cycling. In brood reduction experiments, cannibal males showed low levels of plasma 11-ketotestosterone (11-KT) relative to noncannibals and also similar levels of 11-KT to males in the parental care phase. Since 11-KT regulates male courtship intensity, males with decreased courtship activity would exhibit total filial cannibalism. However, there is a possibility that a transient increase in 11-KT levels at the early stage of parental care delays total filial cannibalism. In contrast, total filial cannibalism could occur before a decline to the lowest 11-KT levels, at which point males might still be able to exhibit courtships, possibly to reduce the costs of parental care. To understand how much and when caregiving males exhibit mating and parental care behaviors, it is important to consider not only the presence of endocrinological constraints but also its intensity and flexibility.