Fig.2From: Three Gorges Dam: the changing trend of snail density in the Yangtze River basin between 1990 and 2019Estimation of the mean density of O. hupensis snails between 1990 and 2019. A The downstream area of TGD; B the upstream area of TGD). F Flood; TGD Three Gorges Dam; D Drought; S Snow; L CI Lower limit of the 95% confidence interval; U CI Upper limit of the 95% confidence intervalBack to article page