The adaptive role of a species-specific courtship behaviour in coping with remating suppression of mated females
The adaptive role of a species-specific courtship behaviour in coping with remating suppression of mated females
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物种特异性求偶行为在应对交配雌性再交配抑制中的适应性作用
DOI：
10.1016/j.anbehav.2018.04.002
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发表时间：
2018
期刊：
影响因子：
2.5
通讯作者：
Takashi Matsuo
中科院分区：
文献类型：
--
作者：
Kazuyoshi Minekawa;Takashisa Miyatake;Yukio Ishikawa;Takashi Matsuo
在精子竞争的背景下，雌性与其当前和以前的配偶组成的三向相互作用已被深入研究，其中涉及雄性操纵雌性发育率，但很少在更广泛的背景下被记录下来，涉及经典的先于雄性的展示和刺激特征，如求偶行为。这很令人惊讶，因为优势特征会影响交配后竞争的强度，而这种竞争只有在交配后的雌性连续接受另一只雄性时才会发生。在果蝇中，随后的雄性在精子竞争中比先前的雄性更有优势。然而，先前雄性的射精改变了雌性的行为，使其在几天内拒绝交配(交配抑制)，从而降低了后续交配的潜在优势。在这样的条件下，任何抵消抑制的手段的进化都被认为是对随后的雄性适应的。果蝇的雄性会延长求偶时间，形成一种独特的求偶行为，称为“腿振动”。尽管腿部振动增加了雌性的接受度，但与处女交配并不总是需要腿部振动，这引发了一个问题，即为什么它一开始就进化了。在这项研究中，研究了腿部振动在记忆中的作用，使用腿部截肢来操纵腿部振动的效率，并使用眼睛颜色突变来检测记忆事件。腿的振动对交配的雌性有深远的影响：截肢的雄性的修复率极低，这表明腿振动对新近交配的雌性的修养几乎是必不可少的。我们的结果表明，单一求爱行为对第一只雄性和随后的雄性具有不同程度的重要性或必要性，这为可能由交配后竞争驱动的求爱行为的演变提供了一个例子。
Three-way interactions consisting of a female and her current and previous mates have been studied intensively in the context of sperm competition involving male manipulation of female remating rate but have rarely been documented in a broader context involving classical premating male display and stimulatory traits such as courtship behaviour. This is surprising because premating traits influence the intensity of postmating competition, which occurs only when a mated female consecutively accepts another male. InDrosophilafruit flies, the subsequent male has an advantage over the previous male in sperm competition. However, the ejaculate of the previous male changes the female's behaviour to refuse remating for several days (remating suppression), reducing the potential advantage of the subsequent male. Under such conditions, the evolution of any means that counteract remating suppression is thought to be adaptive for the subsequent male. Males of the fruit flyDrosophila prolongataperform a unique courtship behaviour called ‘leg vibration’. Although leg vibration increases female receptivity, it is not always required for mating with virgin females, raising a question of why it evolved in the first place. In this study, the role of leg vibration in remating was examined, using leg amputation to manipulate the efficiency of leg vibration and an eye colour mutation to detect remating events. Leg vibration had a profound effect on mated females: the remating rate was extremely low with leg-amputated males, indicating that leg vibration was almost indispensable for remating of recently mated females. Our results demonstrated that single courtship behaviour has different levels of importance or necessity for the first male and the subsequent males, providing an example of the evolution of courtship behaviour that was possibly driven by postmating competition.
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