population vitality

VITALITY DYNAMICS OF TULIPA GESNERIANA L. (LILIACEAE, LILIOPSIDA) POPULATIONS IN THE LOWER VOLGA REGION AND ADJACENT TERRITORIES

The vitality of 38 Tulipa gesneriana populations in the Lower Volga region and adjacent territories was monitored during four agricultural seasons (2013 - 2016). A significant variability of this parameter, correlated with certain geographical trends, is shown within the territory surveyed. Two population clusters were revealed, differing by oppositely directed responses to external factors. A similar variability character was also obtained from ordination of the studied cenopopulations using the average values of morphological traits by means of the principal component analysis.