Igarashi Kota, Osawa Takeshi
Graduate School of Urban Environmental Sciences, Tokyo Metropolitan University, Minami-Osawa 1-1, Hachiouji, Tokyo, 192-0397, Japan.
Yachiyo Engineering Co., Ltd., Asakusabashi 5-20-8, Taito-ward, Tokyo, 111-8648, Japan.
Sci Rep. 2025 Jul 2;15(1):23567. doi: 10.1038/s41598-025-05938-6.
Disturbances are pivotal ecological events that influence the formation of biological communities. Although disturbances have been studied in isolation, studies recently have highlighted the interaction among multiple disturbances. Riparian plant communities are primarily shaped by flooding disturbances, where periodic seasonal floods, and rare large-scale floods also play a role. Therefore, the interaction between these floods can markedly impact the formation of riverine plant communities. Such disturbance interactions, caused by the same type of representation, have been overlooked. In this study, we examined a riparian area impacted by Typhoon Hagibis in October 2019, situated along the Akigawa River in Tokyo. Through a comparison of land covers before and after the typhoon, we determined the effects of large-scale flood, and assessed the influence of periodic floods one and two years post-typhoon. Plant community surveys were conducted in both post-typhoon periods, investigating the relationship between community structure using both α- and β-diversity and disturbance interaction regimes. One year postdisturbance, the plant communities strongly reflected the varying intensities of the large-scale flood disturbance. However, two years postdisturbance, community structures exhibited changes, likely influenced by interactions with periodic disturbances. The results of this study suggest that interactions with the same type of disturbance may enhance community diversity.
干扰是影响生物群落形成的关键生态事件。尽管干扰已被单独研究，但最近的研究强调了多种干扰之间的相互作用。河岸植物群落主要受洪水干扰塑造，其中周期性的季节性洪水以及罕见的大规模洪水也起作用。因此，这些洪水之间的相互作用会显著影响河滨植物群落的形成。由相同类型表现引起的这种干扰相互作用一直被忽视。在本研究中，我们考察了2019年10月受台风海贝斯影响的一个河岸区域，该区域位于东京的秋川沿岸。通过比较台风前后的土地覆盖情况，我们确定了大规模洪水的影响，并评估了台风后一年和两年周期性洪水的影响。在台风后的两个时期都进行了植物群落调查，利用α多样性和β多样性研究群落结构与干扰相互作用模式之间的关系。干扰发生一年后，植物群落强烈反映了大规模洪水干扰的不同强度。然而，干扰发生两年后，群落结构出现了变化，可能受到与周期性干扰相互作用的影响。本研究结果表明，与相同类型干扰的相互作用可能会增强群落多样性。
