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Diatoms (Bacillariophyta) of the world’s highest aquatic environments from the Western Himalayas, India

Pardhi Samadhan, Thiruvalan Thiruvalan, Thacker Mital, Alakananda B., Karthick Balasubramanian

Oceanological and Hydrobiological Studies

2023

Vol. 52, No. 2

172--205

The present study is a preliminary taxonomic surveyof diatom assemblages from one of the highest mountainranges in the Western Himalayas – Ladakh. 37 sampleswere collected from 19 different sampling sites at altitudes ranging from 3100–4552 amsl. The diatom communities were representative of habitats such as lakes, streams, and hot springs from high altitudes. The dominant diatomsare studied using light microscopy and identified using valve morphometrics. The study enlists a total of 74 taxa belonging to 40 genera along with photomicrographic plates. Commonly-found species of high-altitude hot springs habitats were Gogorevia exilis and Denticula thermaloides.Reimeria sinuata, Fragilaria vaucheriae, Gomphonella cf.olivacea, Encyonema ventricosum, Lindavia biswashanti,Diatoma moniliformis, and Denticula valida were commonly occurring species in stream, river and lake habitats. Further analysis and putative novel species from this high-altitude environment will be described in future publications.