Helping native aquatic plants return to the Coorong
An innovative restoration trial is underway in the Coorong, building on years of research to support the recovery of an important aquatic plant.
The Healthy Coorong, Healthy Basin (HCHB) Ecological Restoration Project (ERP) is undertaking a trial focused on Ruppia tuberosa, a keystone plant species for the Southern Coorong that contributes to maintaining water quality and trapping sediment, while providing habitat for invertebrates and fish, and food for waterbirds.
Since the end of the Millennium Drought in 2010, excessive algal growth has negatively impacted the growth of Ruppia, which is now described as vulnerable, but research undertaken as part of Phase 1 of HCHB found that previous restoration projects were successful in helping Ruppia recover. Building on this knowledge, researchers from Adelaide University launched an ERP field trial in the Coorong North Lagoon, an area where Ruppia has disappeared and not naturally returned, despite suitable environmental conditions.
The trial began with the collection of seed-rich sediment from the dry lakebed at Lake Cantara, then transporting it to the trial site. Using an inflatable kayak, the crates of sediment were floated across the shallow waters to carefully spread the seeds directly into the lagoon. The trial marks the first time this water-dispersion technique has been utilised.
Adelaide University researchers will monitor the site throughout the year to collect essential ecological data on Ruppia growth, survival and distribution. The findings will help guide future restoration activities to support habitat recovery and long-term ecosystem health in the Coorong.
Healthy Coorong, Healthy Basin is jointly funded by the Australian Government and the Government of South Australia.
