Takagi Etsuro
Department of Tourism Science Tokyo Metropolitan University Tokyo Japan.
Ecol Evol. 2023 Jul 5;13(7):e10274. doi: 10.1002/ece3.10274. eCollection 2023 Jul.
The preference-performance hypothesis (PPH) predicts that female insects maximize their fitness by ovipositing on hosts where their offspring perform the best. The preference-performance relationships in bark beetles are complex because before offspring development can occur in the phloem, adult bark beetles must first successfully invade host trees, and then construct galleries beneath the bark. Therefore, a positive correlation between host preference and successful colonization is necessary for the PPH in bark beetles to hold (i.e., the preference-colonization hypothesis in bark beetles). In this study, through field choice experiments, I investigated the successful colonization of the bark beetle, , within four allopatrically distributed species across a distinct biogeographic boundary in Japan. The results of this study showed that the biogeographic boundary did not limit the successful colonization by . . I observed that successful colonization was low in . , despite it being an exotic species in the study sites and the most preferred at the study sites, indicating a mismatch between preference and colonization success. Additionally, I observed that . had a high colonization success rate, even though it was the least preferred species at the study sites.
偏好-表现假说（PPH）预测，雌性昆虫通过在其后代表现最佳的宿主上产卵来最大化其适合度。树皮甲虫的偏好-表现关系很复杂，因为在韧皮部中后代发育之前，成年树皮甲虫必须首先成功侵入宿主树，然后在树皮下方建造虫道。因此，宿主偏好与成功定殖之间的正相关关系对于树皮甲虫的PPH成立是必要的（即树皮甲虫的偏好-定殖假说）。在本研究中，通过田间选择实验，我调查了树皮甲虫在日本一个独特生物地理边界内的四个异域分布物种中的成功定殖情况。这项研究的结果表明，生物地理边界并没有限制……的成功定殖。我观察到……的成功定殖率很低，尽管它在研究地点是外来物种且是研究地点中最受偏好的，这表明偏好与定殖成功之间存在不匹配。此外，我观察到……的定殖成功率很高，尽管它是研究地点中最不受偏好的物种。
