Abstract
Large tributaries of Lake Baikal considered as a “hotspot” for silica-scaled chrysophytes diversity. Here we presented the updated species composition of silica-scaled chrysophytes and ecological parameters of their habitat in the Barguzin and Selenga River tributaries and delta in a high water level period. The number of registered taxa was significantly lower compared to the low water conditions (23 versus 66 species) and included the following genera with a given number of species: Chrysosphaerella – 1; Paraphysomonas – 2; Clathromonas – 1; Spiniferomonas – 3; Mallomonas – 9; Synura – 7. Mallomonas guttata and Synura borealis were identified in Russian waters for the first time. Thus, the corrected total list of silica-scaled chrysophytes in the Baikal Region includes 79 taxa. Though, the high water level reduced the total number of silica-scaled chrysophyte taxa, it made the water ecosystem more dynamic by enriching it with the entirely new species for this region.
Highlights
Lake Baikal is the most ancient and deepest (1637 m) lake in the world
The water temperature in the Selenga and its tributaries was 18.5–20.9°С (Table 1); it varied from 10.2°С in the upper reaches of the Barguzin River up to 20.9°С in its mouth
High pH values were recorded in Lake Zavernyaikha, the Kharauz Creek and at the upper reaches of the Barguzin River; the lowest pH was recorded in the Chikoy River
Summary
Lake Baikal is the most ancient and deepest (1637 m) lake in the world It has a tectonic origin and lies in a deep depression surrounded by mountain.
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