To investigate how the water temperature influences diversity and distribution pattern of cyanobacteria and microalgae in a thermal spring, algal samples were collected from Tapovan Hot Spring of Garhwal Himalaya, Uttarakhand, India, along the gradient of 52–30 °C. A total of 71 algal species belonging to different algal groups like Cyanophyta (34), Bacillariophyta (31) and Chlorophyta (6) were identified from the collected samples. Among cyanophytes, five species were heterocystous, while others belonged either to non-heterocystous filamentous (20) or to unicellular forms (9). The species richness decreases as temperature increases towards the source point of the spring (i.e. from subsite S₅ to S₁). However, Shannon’s measured diversity varied little across the subsites except witnessing a sudden drop at S₂. Whittaker’s components of diversity, such as beta and gamma diversity, successfully reflected the major changes in the species composition of cyanobacterial and microalgal communities residing in different thermal subsites. Some green algae and diatoms were found thriving well at elevated temperatures (> 38 °C). These species need to be studied further for their under-operating cellular mechanisms and encompassing robust biomolecules that might be proven useful in diverse biotechnological processes.

为了研究水温如何影响温泉中蓝藻和微藻的多样性和分布模式，从印度北阿坎德邦 Garhwal Himalaya 的 Tapovan 温泉沿 52–30 °C 的梯度收集了藻类样品。从收集的样品中鉴定出属于不同藻类的总共 71 种藻类，如蓝藻门 (34)、芽孢杆菌门 (31) 和叶绿门 (6)。在蓝藻中，有五个物种是异型的，而其他物种属于非异型丝状 (20) 或单细胞形式 (9)。物种丰富度随着温度向泉源点（即从子站点 S ₅到 S ₁）。然而，除了目睹 S ₂突然下降外，香农测量的多样性在各个子站点中几乎没有变化。Whittaker 的多样性组成部分，例如 β 和 γ 多样性，成功地反映了居住在不同热亚地点的蓝藻和微藻群落的物种组成的主要变化。发现一些绿藻和硅藻在高温（> 38 °C）下生长良好。需要进一步研究这些物种的运作不足的细胞机制，并包含可能被证明在不同生物技术过程中有用的强大生物分子。