SYMMETRIC AND ASYMMETRIC CHANGES OF THE FORM OF <i>POPULUS NІGRA </i>L. S.L. LEAF BLADE IN THE CONDITIONS OF URBAN ECOSYSTEMS
An assessment of symmetric and asymmetric changes as components of the variation of the shape of thePopulus nіgraL. s.l. leaf blade in urban ecosystemsis given. Asymmetrical changes make a greatercontribution to the variability of the shape of the apex and the middle third of the leaf blade than symmetrical changes. Asymmetric changes are characterized by the manifestation of ﬂuctuating asymmetry, a statistically signiﬁcant directional asymmetry was not detected. The maximum degree of variability of the leaf blade associated with ﬂuctuating asymmetry falls on the tip of the leaf blade.