Octopaminergic system orchestrates combat and mating behaviors: A potential regulator of alternative male mating tactics in an armed beetle
Octopaminergic system orchestrates combat and mating behaviors: A potential regulator of alternative male mating tactics in an armed beetle
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章鱼胺能系统协调战斗和交配行为：武装甲虫中替代雄性交配策略的潜在调节者
DOI：
10.1016/j.jinsphys.2021.104211
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发表时间：
2021
影响因子：
2.2
通讯作者：
Okada Yasukazu
中科院分区：
文献类型：
--
作者：
Kiyose Katsuya;Katsuki Masako;Suzaki Yu;Okada Kensuke;Okada Yasukazu
雄性与雄性争夺雌性和领地的斗争在动物分类群中普遍存在。战斗的胜利者获得资源，而失败者则在没有获得资源的情况下承受巨大的成本（例如时间、精力和伤害）。许多动物根据其营养状况和经验进化出了行为灵活性，以避免战斗，从而降低此类成本。在这些情况下，雄性的攻击性通常与交配行为的变化相关，即替代性繁殖策略的部署。因此，揭示协调战斗和交配行为的生理机制对于理解替代交配策略的演变至关重要。然而，到目前为止，我们的知识仅限于特定模式物种的特定行为（即战斗或交配）。在这项研究中，我们使用了武装甲虫（Gnatocerus cornutus），并假设无脊椎动物攻击性的关键神经调节剂之一章鱼胺（OA）可以控制雄性战斗和其他交配行为。使用受体激动剂（杀虫脒和苯并咪唑），我们发现章鱼胺能（OAergic）系统下调了战斗和求爱行为，同时上调了运动活动和精子大小。这表明 OAergic 系统协调了一系列战斗和交配行为，从而暗示对 OAergic 信号的相关行为反应可能推动了这种甲虫替代交配策略的进化。
Male-male combats over females and territories are widespread across animal taxa. The winner of a combat gains resources, while the loser suffers significant costs (e.g. time, energy and injury) without gaining resources. Many animals have evolved behavioral flexibility, depending on their nutritional condition and experience, to avoid combat in order to reduce such costs. In these cases, male aggression often correlates with mating behavior changes, that is, the deployment of alternative reproductive tactics. Therefore, uncovering the physiological mechanism that orchestrates combat and mating behaviors is essential to understand the evolution of alternative mating tactics. However, so far, our knowledge is limited to specific behaviors (i.e., fighting or mating) of specific model species. In this study, we used an armed beetle (Gnatocerus cornutus) and hypothesized that one of the key neuromodulators of invertebrate aggression, octopamine (OA), would control male combat and other mating behaviors. Using receptor agonists (chlordimeform and benzimidazole), we showed that the octopaminergic (OAergic) system down-regulated the combat and courtship behaviors, while it up-regulated locomotor activity and sperm size. This suggests that the OAergic system orchestrates a suite of fighting and mating behaviors, thereby implying that correlated behavioral responses to OAergic signaling may have driven the evolution of alternative mating tactics in this beetle.