Impact of weather conditions on the seasonal development, population structure and reproductive success of Dactylorhiza incarnata s. l. (Orchidaceae, Liliopsida) in the Komi Republic

The results of our eight-year study a population the rare orchid Dactylorhiza incarnata subsp. cruenta at northern limit its range (the Komi Republic) are presented. Weather factors (air temperature and precipitations) were revealed to influence features small big life cycles this species. number plants in studied was influenced by weather conditions previous growing season, positively August negatively frosts October. generative (flowering) had positive correlation with air July vegetative season. fruit set high (71.2%) associated precipitation during flowering seed per (9,831 pcs on average) higher than that more southern parts This indicator, as well real productivity species, is related level moisture availability current production high, from 34 thousand 154.6 seeds 1 m2 several years, it sum active temperatures presence juvenile individuals (10.0–31.7%) over all years indicates successful reproduction population.