Unique corals surrounding Norfolk Island are under severe threat due to disease, the impending El Niño phenomenon, and a federal government-approved dredging project. According to Prof Bill Leggat from the University of Newcastle, these corals, which are likely unclassified species, could be lost forever.
Coral Health Declines Amid Rising Threats
Research indicates that the coral reefs around Norfolk Island are experiencing alarming health declines. A recent report highlights that since March, there has been a three-fold increase in diseased corals during one of the longest-running coral disease events recorded in Australian waters. The primary concerns are related to water quality, with pollution and sediment runoff from land management practices exacerbating the situation.
“The main issue is the nutrients that increase coral disease and then algal growth that puts more stress on the corals,” Prof Leggat stated. The corals are particularly vulnerable during heavy rain events, which increase sediment and pollutant runoff into the lagoons.
Impact of El Niño on Coral Reefs
The developing El Niño in the Pacific poses additional risks to the coral ecosystems. Prof Tracy Ainsworth from the University of New South Wales noted that this climatic event could elevate summer water temperatures, leading to coral bleaching and possible mortality. “That is everything that you can do to kill corals. It is too much for corals to survive,” Ainsworth emphasized.
Monitoring by the CSIRO has revealed that between 30% and 50% of corals have exhibited symptoms of disease over the past five years, largely attributed to pollution from cattle farming and wastewater management.
