The specific rate of the population dynamics of the black-striped pipefish Sygnathus nigrolineatus Eichwald, 1831 in the Kremenchug and Dneprodzerzhinsk reservoirs at different phases of the naturalization of the species

Abstract

The possible causes of the invasion of the black-striped pipefish Sygnathus nigrolineatus Eichwald, 1831 into two water reservoirs of the Dnieper Cascade of Hydroelectric Stations are described. The average, maximum, and minimum specific rates of the change of the abundance of the species in the recipient water bodies are analyzed since the onset of the invasion. Specification of different phases of naturalization is based on the analysis of dynamic phase portraits of the species abundance. The periods of the equilibrium states of the population are revealed. The potential rates of the increase of the species abundance in the Dneprodzerzhinsk and Kremenchug reservoirs are assessed.