Comparative analysis of population characteristics of two viviparid species (Mollusca: Viviparidae) in water bodies of Ukraine

The study presents new information on the population characteristics of two river snail species, Viviparus viviparus (Linnaeus, 1758) and V. contectus (Millet, 1813), in the water bodies of Ukraine in 2007–2018. The analyzed features include data of the species distribution, numbers and biomass, age and sex ratio population structure, fertility, growth and production. Ecological factors (flow rate, temperature, the concentration of oxygen, pH,...