The study investigates global patterns of river connectivity within the distribution ranges of freshwater megafauna, defined as freshwater animals that can reach 30 kg, and explores how those patterns could change in the future. It finds that susceptibility to reduced connectivity depends on life history.
The results highlight the reduced connectivity of rivers currently inhabited by freshwater megafauna and the future intensification of fragmentation in megafauna-rich basins. They call for life-history studies, identification of critical habitats, updated IUCN Red List assessments and strategic siting, design and operation of proposed dams.