Fujimoto Shingo, Tsurui-Sato Kaori, Katsube Naotaka, Tatsuta Haruki, Tsuji Kazuki
Center for Strategic Research Project University of the Ryukyus Nishihara Japan.
Present address: Graduate School of Medicine University of the Ryukyus Okinawa Japan.
Ecol Evol. 2021 Mar 29;11(9):3884-3900. doi: 10.1002/ece3.7267. eCollection 2021 May.
Sexual conflict can result in coercive mating. Because males bear low costs of heterospecific mating, coercive males may engage in misdirected mating attempts toward heterospecific females. In contrast, sexual selection through consensual mate choice can cause mate recognition cues among species to diverge, leading to more accurate species recognition. Some species show both coercive mating and mate choice-associated courtship behaviors as male alternative reproductive tactics. We hypothesized that if the selection pressures on each tactic differ, then the accuracy of species recognition would also change depending on the mating tactic adopted. We tested this hypothesis in the guppy () and mosquitofish () by a series of choice experiments. and . males both showed imperfect species recognition and directed all components of mating behavior toward heterospecific females. They tended to direct courtship displays more frequently toward conspecific than heterospecific females. With male . , however, accurate species recognition disappeared when they attempted coercive copulation: they directed coercions more frequently toward heterospecific females. We also found that heterospecific sexual interaction had little effect on the fecundity of gravid females, which suggests that prepregnancy interactions likely underpin the exclusion of . by in our region.
性冲突可能导致强制交配。由于雄性进行异种交配的成本较低，具有强制性的雄性可能会对异种雌性进行错误导向的交配尝试。相比之下，通过双方自愿的配偶选择进行的性选择会导致物种间的配偶识别线索出现差异，从而实现更准确的物种识别。一些物种同时表现出强制交配和与配偶选择相关的求偶行为，作为雄性的替代繁殖策略。我们推测，如果对每种策略的选择压力不同，那么物种识别的准确性也会根据所采用的交配策略而变化。我们通过一系列选择实验，在孔雀鱼（ ）和食蚊鱼（ ）中检验了这一假设。 和 雄性都表现出不完全的物种识别能力，并且将交配行为的所有组成部分都指向异种雌性。它们对同种雌性比异种雌性更频繁地进行求偶展示。然而，对于雄性 ，当它们尝试强制交配时，准确的物种识别消失了：它们对异种雌性进行强制的频率更高。我们还发现，异种性互动对怀孕雌性的繁殖力影响很小，这表明怀孕前的互动可能是我们研究区域内 排除 的基础。
