Identification of hotspots of threatened inland fish species and regions for restoration based on longitudinal river connectivity.

摘要: Abstract Dams have reduced longitudinal river connectivity (LRC) worldwide, impairing habitat and migration opportunities for many freshwater fish species. However, national assessments linking LRC threatened inland species distributions are lacking. Here, we show the trends in China over past 60 years, quantitatively analyse their implications The average decreased from 93.5% 1960 to 25.1% 2018, significant deterioration occurred last 20 years. Water resource regions with a high number of concentrated southern China, degree threat increases decreasing LRC. A total 125 by degradation loss, which is mainly caused construction dams. Intrinsic factors pollution two other key threats addition reduction results this study can help us better understand fishes. Meanwhile, provides guidance management preserve biological diversity, including enhancing natural reserve areas, establishing ecological compensation mechanisms, preventing invasion, monitoring evaluation restoration efforts.