Mechanisms of influence of invasive Bidens frondosa L. on indigenous Bidens species

Abstract

Long-term (2002–2010) stationary observations on the populations of invasive North American Bidens frondosa L. and indigenous Bidens species were carried out on the banks of Kuibyshev, Cheboksary, and Gorky reservoirs. It was found that, during the invasion of B. frondosa into the biota, its populations, as well as the populations of indigenous Bidens species, underwent significant changes caused by an active natural hybridization and resulting in the vanishing of a local B. tripartita species, reduction of the B. radiata population, and the formation of a new form of alien B. frondosa .