Zuk Marlene, Rotenberry John T, Simmons Leigh W
Department of Biology, University of California, Riverside, California, 92521.
Department of Zoology, University of Western Australia, Nedlands 6009, Western Australia, Australia.
Evolution. 1998 Feb;52(1):166-171. doi: 10.1111/j.1558-5646.1998.tb05149.x.
The field cricket Teleogryllus oceanicus has been introduced to Hawaii, where it is parasitized by an acoustically orienting parasitoid fly, Ormia ochracea. Previous work showed that call parameters from parasitized populations differ from those in unparasitized populations in a direction expected if selection by flies is occurring. Here we examined songs of males collected in the field and compare calling song characters of crickets later found to harbor parasitoid larvae with those of males free of parasitoids. The two groups differ significantly in several song characteristics, particularly the trill-like long chirp given at the beginning of each song. Males with longer long chirps containing shorter interpulse intervals are more likely to be parasitized, suggesting that the flies find such males more attractive. Depending on the traits females prefer, sexual selection may oppose natural selection in altering T. oceanicus song in parasitized populations.
田野蟋蟀Teleogryllus oceanicus已被引入夏威夷，在那里它受到一种通过声音定向的寄生蝇——金黄卵蜂Ormia ochracea的寄生。先前的研究表明，如果存在寄生蝇的选择作用，那么受寄生种群的鸣叫参数会朝着预期的方向与未受寄生种群的参数有所不同。在此，我们检查了在野外收集的雄性蟋蟀的鸣声，并将后来发现体内带有寄生蝇幼虫的蟋蟀的鸣叫特征与未受寄生的雄性蟋蟀的特征进行了比较。这两组在几个鸣声特征上存在显著差异，尤其是在每段鸣声开始时发出的类似颤音的长唧唧声。长唧唧声较长且脉冲间隔较短的雄性蟋蟀更有可能被寄生，这表明寄生蝇觉得这类雄性更具吸引力。根据雌性蟋蟀偏好的特征，性选择可能会在改变受寄生种群的Teleogryllus oceanicus鸣声方面与自然选择产生对抗。
