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Unique corals at risk from pollution and dredging
5 Jul
Summary
- Unknown coral species face extinction due to multiple threats.
- Disease and pollution have increased threefold since March.
- Dredging plans add to the perfect storm for fragile reefs.
Scientists are deeply concerned about the future of Norfolk Island's unique coral reefs, which may host numerous species yet to be formally described. These fragile ecosystems are currently facing a severe triple threat: widespread coral disease, the impacts of an developing El Niño, and a federal government plan to dredge a neighboring shipping channel. Heavy rains have exacerbated water quality issues, washing sediment and nutrients from cattle farming and wastewater into the coral lagoons, significantly increasing coral disease and algae growth.
Research over the past five years indicates that 30% to 50% of corals have displayed disease symptoms, with a threefold increase observed since March. This ongoing disease event is one of the longest recorded on Australian reefs. The developing El Niño poses a further risk of elevated summer water temperatures, leading to coral bleaching and potential death. The planned dredging of a channel to improve access to Kingston Pier, set to begin work later this year, adds to the pressure, creating what experts describe as a 'perfect storm' for the corals.
Experts emphasize the urgent need for improved water quality management to mitigate the impact of pollution and sediment. While the federal infrastructure department states the Kingston Pier project has environmental approvals with strict conditions, including real-time water quality monitoring, local residents and scientists stress the irreplaceable value of these reefs. The Norfolk Island regional council acknowledges the need for ongoing management of waterways and wastewater, with new strategies in development.
