Introduction The 2020 Yangtze River ten-year fishing ban represents a landmark conservation intervention, yet its ecosystem-level effects within ex situ reserves for critically endangered aquatic megafauna remain largely uncharacterized. Methods We compared pre-ban (2016) and post-ban (2024–2025) fish surveys in He-wang-miao Oxbow, a designated ex situ reserve for the critically endangered Yangtze finless porpoise ( Neophocaen...

Heavy precipitation events (HPEs) in the Yangtze River Valley (YRV) pose persistent threats to population safety and infrastructure. This study classifies five population‐weighted HPE types (P1–P5) and examines their underlying dynamics using multiscale window transform and canonical energy transfer framework. Each type links to distinct circulation patterns. During 1979–2020, P1 and P2 are associated with Meiyu front systems,...