Abstract
In the south of the Krasnoyarsk Territory (Middle Siberia, Russia), the presence of N. marina was confirmed by new findings, in addition to historical collections, which were made more than 100 years ago in the South-Minusinsk basin. We have found this species additionally in three lakes in the North-Minusinsk basin, which are the northernmost localities in the Krasnoyarsk Territory. According to our findings, published data, and herbarium collections from Middle Siberia and adjacent regions, all specimens of large Najas belong to N. marina s. str. The species occur in lakes situated in landscapes with marine and lacustrine deposits in intermountain depressions with a continental arid climate. The increase of aridity of climate in southern Siberia will contribute to competitive advantages for populations of N. marina, their emerging and distribution in the studied area in connection with decreasing water level and increasing salinity which happen time to time and has fluctuating character.
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