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Doon, a unique synclinal valley is surrounded by the lesser Himalaya and Shivalik mountain ranges in Uttarakhand. The
Ganga river basin drains the eastern extremity and the Yamuna river basin drains the western extreme of the valley. All
water sources (streams, pools and springs) were sampled at different 30 stations during 2006-2008, regularly at monthly intervals.
Diatom samples were collected from 3x3 cm
area of the benthic substrate (cobble, vegetation) cleaned with acid and mounted
Overall, 358 diatom taxa are recorded for this valley comprising of various genus, species, subspecies and forms. 78 diatom
taxa are observed as the dominant forms, based on the different habitats and ecological conditions prevailing in this valley. Diatom
taxa such as Navicula minuscule var. muralis, Navicula constans var. symmetrica, Navicula radiosa, Cyclotella menenghiana,
Gomphonema affine var. affine, Diatoma elongatum var. tenuis, Synedra inaequalis var. jumlensis and Amphora montana have
come up as the dominant taxa found only at one station or grid. Navicula goeppertiana var. goeppertiana, Achnanthes gondwana,
Achnanthes kryophila, Achnanthes exigua, Achnanthes heterovalvata, Cymatopleura amphicephala are among those dominant
forms found only in one basin. Naviculla phyllepta is found abundant for main rivers and that too only during winters. Navicula
cryptotenella as dominant taxa found throughout the valley but only in forest rich areas and with less disturbance.
The study also gives a brief idea of the distribution of dominant forms of diatoms with the context of habitat and other
ecological conditions of this large valley.
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