Ecological Systems and Devices Annotation << Back ECOLOGICAL FEATURES AND MONITORING OF THE POPULATION STATUS OF OPHRYS OESTRIFERA M. BIEB. (ORCHIDACEAE) IN THE SOUTH-EASTERN CRIMEA V.G. Shatko, Yu.N. Gorbunov, V.A. Kryuchkova The results of 13-year monitoring of the cenopopulation of a rare species of flora of the Crimea, Russia and Southern Europe – Ophrys oestrifera M. Bieb. are summed up. The features of the ecology of its habitat and the dynamics of the age spectrum of cenopopulations in the South-East Crimea on the territory of the Kiziltash tract have been established. The ecological type of O. oestrifera can be characterized as heliophyte, xeromesophyte, according to the light regime – heliophyte, according to the salt regime – glycophyte, hemicryptophyte with underground organs of the tuberoid type. Type of reproduction seed. The analysis of the dynamics of the number of age groups showed that the total number of the population increased over the years of observation, the number of individual age groups fl uctuates from year to year, which is associated with the peculiarities of the habitat and weather conditions. Analysis of the data on the state of the studied cenopopulation shows that it is young, full-grown with a predominance of juveniles in the age spectrum. The population is normal, growing, capable of self-maintenance without introducing primordia from the outside. Keywords: Ophrys oestrifera; habitat ecology; population; population dynamics; age structure. DOI: 10.25791/esip.12.2021.1272 Pp. 10-18.