The project captured an unique opportunity to investigate ecological response to a natural flood (>90,000 ML/day) in the lower River Murray following about ten years drought. The project took a holistic approach, undertaking research on flow/flood related ecological processes and the response of key biota across the main channel, wetlands and floodplain. The research demonstrated that natural flooding in 2010-11 facilitated important ecological processes including increased primary production, improved lateral and longitudinal connectivity, lateral bank recharge, re-structuring of aquatic plant communities, plant recruitment and fish spawning, recruitment and movement, leading to increased abundances, improved condition and recovery of key communities after drought.
The research outcomes highlight that flooding, as an integral part of the natural flow regime, is important in maintaining the ecological integrity of floodplain rivers. The knowledge developed will inform environmental water planning and flow management to maximise ecological outcomes in the lower River Murray.