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The paper presents a four-year study results of a rare Dagestan endemic Nonea decurrens (C.A. Mey.) G. Don fil. сoenopopulation state on the Narattyubinsky ridge (Foothill Dagestan). An irregular distribution on the study area was found with confinement mainly to shrub communities. The degree of morphometric characters variability of the vegetative and generative spheres of Nonea decurrens in the two coenopopulations studied varies both between sites and research years. The maximum values of biometric indicators were noted in different years for site 2. 2013 was the most favorable period for the vegetative sphere development, while higher values in general were found in 2012. The calculated vitality data of the studied coenopopulations revealed their depressive state according to the majority of morphometric characters for all years of research. Based on the results of one-way analysis of variance, the influence of weather conditions (temperature and precipitation) on the quality of coenopopulations in the years of the study was established. The obtained materials can serve for further monitoring of rare species. Recommendations for the protection of the species are given.

samarskij naučnyj vestnik

The state of the rare endemic species population Nonea decurrens (C.A. Mey.) G. Don fil. (fam. Boraginaceae, Magnoliopsida) on the Narattyubinsky ridge and its dynamics