Abstract
Mountain mires are studied in the valleys of the Karasu and Kurnoyatsu Rivers – tributaries of the Cherek Balkarsky River flowing in the Central Jurassic and North Jurassic depressions. As a result of ecological and phytocenotic classification using cluster analysis methods, 11 formations were identified, 4 of which belonging to Hygrosphagnion, 4 to Phorbion types of mire vegetation, 2 ones are borderline with wet meadows, and 1 includes stream communities. The most common communities belong to Cariceta rostratae and Cariceta transcaucasici formations. The leading role in the distribution of communities on the ordination diagram is played by the flow rate of moisture. The communities of the Cariceta rostratae formation cover the largest range of heights above sea level. The communities of the Cariceta transcaucasici formation occupy the highest habitats. Small mires include communities of 1–3 formations, larger mires combine communities of 8 or more formations, their maximum diversity is represented on the mire lakes in the valley of the Kurnoyatsu River. Mire lakes and mire vegetation changes occur at different rates.
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