Nagano Koki, Hiraiwa Masayoshi K, Ishiwaka Naoto, Sánchez-Bayo Francisco, Hayasaka Daisuke
Graduate School of Agriculture, Kindai University, Nara 631-8505, Japan.
Faculty of Agriculture, Kindai University, Nara 631-8505, Japan.
iScience. 2025 Jun 13;28(7):112887. doi: 10.1016/j.isci.2025.112887. eCollection 2025 Jul 18.
The poleward expansion of various organisms is accelerating due to global warming, but many aspects of these biological invasions remain unclear. One less documented aspect is the competition among native and invader species (so-called neonatives) with similar ecological niches along a latitudinal gradient. In this study, we compared the foraging behaviors across latitudes between nymphs of the native dragonfly from four different Japanese regions when confronted with its neonative counterpart, . The foraging intake of . nymphs from low-latitude regions did not change in the presence of , whereas native populations from higher latitudes had significantly lower intakes. Our findings imply that while no clear impacts by the neonative species are found at present, threats are expected to be more severe if the invader expands its distribution to northern regions as global warming continues unabated.
由于全球变暖，各种生物向极地的扩张正在加速，但这些生物入侵的许多方面仍不清楚。一个记录较少的方面是本地物种和具有相似生态位的入侵物种（所谓的新本地物种）在纬度梯度上的竞争。在本研究中，我们比较了来自日本四个不同地区的本地蜻蜓若虫在面对其新本地对应物时，不同纬度间的觅食行为。在存在新本地物种的情况下，低纬度地区的若虫的觅食摄入量没有变化，而高纬度地区的本地种群摄入量显著降低。我们的研究结果表明，虽然目前尚未发现新本地物种有明显影响，但如果随着全球变暖持续加剧，入侵者将其分布扩展到北部地区，预计威胁将更加严重。
