Underlying spatial and habitat attributes of a river network are crucial to comprehend the bio-spatial arrangements within it, the study of which suffers from a paucity of information. Despite several reports on various piscine assemblages, no study contributes to understanding the characteristic attributes of the freshwater habitats of the sub-Himalayan Terai–Dooars ecoregion. Therefore, this study aims to uncover such underlying features through a precise understanding of the spatial profile of freshwater habitats and additive partitions of piscine beta diversity. A significant spatial association is found in the upper stretches of most of these torrential freshwater reaches confined to the eastward of the River Teesta basin to the tributaries of River Jaldhaka. Such a pattern is aligned with a higher local contribution to beta diversity (LCBD) values. The spatial map of LCBD indicates that the mid-altitude (100 > elevation > 2000 m) region contains unique or rare species assemblages. This fact is further confirmed by the spatial aggregation of characteristically adapted hill stream fish species with higher species contribution to beta diversity (SCBD) values. The results are further explained by relevant climatic, topographic, nutrients (sediments), and habitat attributes of which climate, topographic, substrate, and land cover features are the most contributory factors. Such variables are subjected to severe modulation following increasing anthropogenic pressure and changing climatic conditions, leading to the jeopardy of these freshwater habitats. Therefore, prime importance should be accorded to the ecological restoration value of these spatially structured torrential freshwater habitats for conservation and monitoring in the coming days.

河流网络的潜在空间和栖息地属性对于理解其中的生物空间安排至关重要，而对其研究却缺乏信息。尽管有几份关于各种鱼类组合的报告，但没有任何研究有助于了解亚喜马拉雅 Terai-Dooars 生态区淡水栖息地的特征属性。因此，本研究旨在通过精确了解淡水栖息地的空间分布和鱼类β多样性的附加分区来揭示这些潜在特征。在这些洪水淡水河段的大部分上游区域发现了一个重要的空间关联，这些河流仅限于 Teesta 河流域以东到 Jaldhaka 河的支流。这种模式与对 Beta 多样性 (LCBD) 值的更高局部贡献一致。LCBD 的空间图表明中海拔（100 > 海拔 > 2000 m）区域包含独特或稀有的物种组合。这一事实通过具有较高物种对贝塔多样性 (SCBD) 值的更高物种贡献的特征适应性山溪鱼类的空间聚集得到进一步证实。结果由相关的气候、地形、养分（沉积物）和栖息地属性进一步解释，其中气候、地形、基质和土地覆盖特征是最大的影响因素。随着人为压力的增加和气候条件的变化，这些变量会受到严重的调节，导致这些淡水栖息地受到威胁。所以，