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Contemporary Problems of Ecology

2016 year, number 3

Conyza Canadensis in the Urban Environment: Vitality Structure of the Populations

G. Yu. MOROZOVA1,2
1Institute of Water аnd Ecological Problems, FEB RAS, 680000, Khabarovsk, Dikopoltseva str., 56
2Pacific Nationаl University, 680054, Khabarovsk, Tikhookeanskaya str., 136
Keywords: Conyza canаdensis, урбанизация, инвазионный вид, урбопопуляция, виталитет, онтогенетическая структура, изменчивость, urbanization, invasive species, urban population, vitality, ontogenetic structure, variability

Abstract

The vitality structure of invasive species in the urban environment was studied on the example of Conyza canаdensis. The data on the comparative analysis of ontogenetic and vitality population structures was given. In stressful urban conditions vitality structures of populations reorganized, the state of individual plants worsened and the quality of populations decreased. The analysis of C. canаdensis state was carried out by studying the reproductive traits (mass of reproductive organs, reproductive effort) and indicators of the size (total elevated phytomass). These features had the closest correlation with the system of the parameters which characterize the morphostructure of individuals and their stability in urban conditions. High plasticity and variability of individuals along the gradient of urbanization was determined. The ontogenetic structure of urban populations of C. canаdensis belongs to the normal type.