Ecology, Morphology, and Ontogenetic Structure of the Cenopopulations of Campanula bononiensis L. (Campanulaceae)

The structure of the coenopopulations of Campanula bononiensis L. in the vicinity of Ulyanovsk under various environmental conditions in 2010 was studied, and its change was traced after 12 years. The material was processed using the new ExOS package (Excel Ontogenetic Spectrum). The assessment of habitats according to the soil scales of D.N. Tsyganov is given. The results showed that C. bononiensis can be characterized as a hemistenobiont species and mesobiont in terms of the illumination–shading factor. This means that all soil factors are limiting for C. bononiensis. Morphological changes in vegetative (stretching of metamer elements) and generative organs (the appearance of a panicle inflorescence, not characteristic of C. bononiensis) were revealed. It was found that in coenopopulations 1 and 2, young generative plants (g1) of C. bononiensis do not differ significantly in their morphological characteristics (leaf blade width, shoot length to inflorescence, inflorescence length, number of flowers) nor do mature generative plants (g2) in terms of shoot length to inflorescence and number of flowers. There are also no differences on the basis of the “number of nodes on the shoot” in coenopopulation 2 between plants of states g1 and g2. In other cases, for all features analyzed (petiole length, leaf blade length and width, shoot length to inflorescence, inflorescence length, number of flowers), when comparing g1 and g2 in CP1; g1 in CP1 and CP2, g2 in CP1 and CP2, and g1 and g2 in CP2, highly significant differences were obtained. According to L.A. Zhivotovsky’s “delta–omega” classification, CP1 was mature in 2010, and CP2 was transitional. After 12 years (2022), both CPs became aging.