River‐groundwater exchanges are crucial for several ecological processes, but difficult to localize. Hyporheic oligochaetes may represent efficient biological indicators of these exchanges, but hydrological disturbance may alter oligochaete distribution and blur the spatial patterns of river‐groundwater exchanges. Oligochaete assemblages were compared in the Drôme River, which is a semi‐natural braided river with an unmodified discharge, and the Ain River, which has reduced sediment mobility and hydropeaking due to several upstream dams. In the semi‐natural river, the oligochaete distribution was mostly controlled by the origin of the water: some stygoxene species (e.g., Chaetogaster spp. and Vejdovskyella intermedia) were restricted to or more abundant in downwellings, whereas a set of stygophiles (e.g., Stylodrilus sp. and Cernovitoviella sp.) and stygobites (e.g., Aberrantidrilus cuspis) were present or more abundant only in upwellings. Species living in fine sediment (e.g., Potamothrix sp. and Tubifex sp.) also occurred in upwellings due to their location at the border of the braided strip. Conversely, in the regulated river, oligochaete assemblages were abundant and diversified, with species living in fine sediment being dominant in the partially clogged stations. The spatial distribution of most species did not follow typical surface‐hyporheic exchange patterns: most stygophiles (e.g., Proppapus volki and Marionina argentea) and some stygobites (e.g., Haber turquini) were found in both upwellings and downwellings or even at stations without water exchanges (e.g., Rhyacodrilus balmensis). In rivers subjected to hydrological disturbance and hydropeaking, oligochaetes became poor indicators of river‐groundwater exchanges.

中文翻译：

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排泄性低聚类是否有效地指示了河床沉积物中的水文交换？在半自然和受管制的河流中进行测试

河水与地下水的交换对于若干生态过程至关重要，但难以本地化。亲水性低聚类可能代表了这些交换的有效生物学指标，但水文扰动可能会改变低聚类的分布并模糊河水交换的空间格局。比较了德隆河（DrômeRiver）和艾因河（Ain River）的水流组合，该河是未经修饰的半天然辫状河，而艾因河则由于多个上游水坝而减少了泥沙的流动性和水峰。在半天然河流中，低聚藻类的分布主要受水的来源控制：一些铁粉类物种（例如Chaetogaster spp。和Vejdovskyella intermedia））仅限于下流道中或更丰富，而仅在上流道中存在或更多地有一组嗜麦针虫（例如Stylodrilus sp。和Cernovitoviella sp。）和虫（例如Aberrantidrilus cuspis）。生活在细小沉积物中的物种（如Potamothrix sp。和Tubifex sp。）也由于上升带位于辫状带边界而出现在上升流中。相反，在受管制的河流中，寡头类群丰富而多样，生活在细沙中的物种在部分被阻塞的站点中占主导地位。大多数物种的空间分布不遵循典型的地表-低脂交换模式：大多数嗜麦针虫（例如，Proppapus volki和Marionina argentea）和一些科动物（例如Haber turquini）在上升流和下降流中甚至在没有水交换的站点（例如Rhyacodrilus balmensis）都被发现。在遭受水文干扰和洪峰影响的河流中，低聚类动物已成为河流-地下水交换的不良指标。