New Alert: US Coral Reef Watch Adds Three Levels to Cope with Unprecedented Heat

MIAMI, Florida – The US Coral Reef Watch program has recently added three new alert categories to their warning system for heat stress on coral reefs. This update comes after last year’s unprecedented heat stress, which caused extensive bleaching and coral mortality across the Americas.

Dr. Derek Manzello, the director of Coral Reef Watch, stated that the increasing impact of heat stress on coral reefs has required a rethinking of their approach. The program’s previous system had four alert levels, with the highest level indicating “severe bleaching and significant mortality likely.” However, last year’s heat stress exceeded even the highest rating, prompting the addition of three new alert levels.

The new alert levels are based on an indicator known as degree heating weeks (DHW), which measures the amount of accumulated heat stress experienced by corals. Coral Reef Watch’s new alert level 3 indicates DHWs of between 12 and 16, while alert level 5 signifies anything above 20 DHWs, with the warning of “near complete mortality” of all corals.

The warning system’s text has also been updated to reflect the severity of bleaching and the risk of coral mortality based on their sensitivity to heat. The changes were deemed necessary due to the extreme heat events experienced in the early 2020s, which surpassed the capabilities of the previous system developed in 2009.

Experts such as Dr. David Wachenfeld and Prof. Tracy Ainsworth have commended the swift action taken by Coral Reef Watch in acknowledging the inadequacy of the old system in describing the unprecedented heat stress faced by coral reefs. Richard Leck, head of oceans at WWF-Australia, emphasized that the new alert system highlights the drastic impact of global heating on ocean temperatures and the risk to coral reefs.

The recent changes to the warning system demonstrate the urgent need to adapt to the changing climate and its impact on coral reef ecosystems. As coral mortality events become more frequent, the global coral reef community has recognized the necessity for updated tools to understand and mitigate the escalating heat stress on reefs.

In conclusion, the adjustments made by Coral Reef Watch exemplify the ongoing challenges and urgency of addressing the consequences of climate change on marine ecosystems. The implementation of new alert levels and updated warning texts reflects the critical need to adapt to the rapidly changing environment and the unprecedented heat stress experienced by coral reefs worldwide.