Sha Zhansen, Chen Huihuang, Jin Lei, Zheng Qingping, Lu Yifan, Sido Mekiso Y, Willis Anusuya, Liu Cunqi, Yang Jun
Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; College of Life Sciences, Hebei University, Baoding 071002, China.
Aquatic EcoHealth Group, Fujian Key Laboratory of Watershed Ecology, Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Harmful Algae. 2025 Feb;142:102786. doi: 10.1016/j.hal.2024.102786. Epub 2024 Dec 10.
The cyanobacterium Raphidiopsis raciborskii has received much attention due to its global distribution and toxin production in freshwater. However, research on understanding the potential factors facilitating its geographical spread, the pattern of increasing range, and long-distance dispersal (LDD) of this species is very limited. In this study, we investigated the role of migratory waterbirds (using domesticated ducks as a proxy) and reservoirs (lentic waterbodies) in global distribution or dispersal of R. raciborskii. First, the global distribution of R. raciborskii under different reservoir scenarios was assessed through meta-analysis. The results showed a significant positive correlation between the global occurrence of R. raciborskii and the global number of reservoirs. Second, testing the capacity of R. raciborskii to spread via endozoochory or ectozoochory with ducks as a proxy of migratory waterbirds. The results indicated that R. raciborskii could be potentially dispersed through ectozoochory but not endozoochory, with a maximum carrying time of ∼96 hours corresponding to a maximum dispersal distance of ∼2300 km. In addition, the duck-carried R. raciborskii survived and could establish populations under suitable conditions. This study provides experimental evidence for the R. raciborskii dispersal through waterbirds. Overall, our results highlight that artificial reservoirs promote the increase of R. raciborskii populations, which could be dispersed across long distance via waterbird ectozoochory, thereby increasing the geographical range of R. raciborskii.
蓝藻拉氏拟柱孢藻因其在全球范围内的分布以及在淡水中产生毒素而备受关注。然而，关于了解促进其地理扩散的潜在因素、分布范围扩大模式以及该物种长距离扩散（LDD）的研究非常有限。在本研究中，我们调查了迁徙水鸟（以家鸭作为替代）和水库（静水水体）在拉氏拟柱孢藻全球分布或扩散中的作用。首先，通过荟萃分析评估了不同水库情景下拉氏拟柱孢藻的全球分布情况。结果显示，拉氏拟柱孢藻在全球的出现与全球水库数量之间存在显著正相关。其次，以家鸭作为迁徙水鸟的替代，测试拉氏拟柱孢藻通过动物体内传播或动物体外传播的扩散能力。结果表明，拉氏拟柱孢藻可能通过动物体外传播而不是动物体内传播进行扩散，最长携带时间约为96小时，对应最大扩散距离约为两千三百公里。此外，家鸭携带的拉氏拟柱孢藻能够存活，并在适宜条件下建立种群。本研究为拉氏拟柱孢藻通过水鸟扩散提供了实验证据。总体而言，我们的结果突出表明，人工水库促进了拉氏拟柱孢藻种群的增加，该藻可通过水鸟体外传播进行长距离扩散，从而扩大了拉氏拟柱孢藻的地理分布范围。
