GoKawiilIUCN reassessment finds 44% of reef-building coral species now threatened
A reassessment of 892 reef-building coral species against IUCN Red List criteria found that of the 774 with sufficient data, 340 species (44%) now qualify as threatened, including 33 Critically Endangered, 251 Endangered and 56 Vulnerable. The analysis, an update of a 2008 assessment, used proxies such as global coral cover trends and projected severe bleaching frequency under a moderate-emissions climate scenario, since population data for most coral species are lacking.
GoKawiil's interpretation of the reporting above, not reported fact.
The assessment predates the three hottest years on record and the ongoing fourth global bleaching event, suggesting the true current risk to coral species could be higher than these figures show. Because the Red List measures relative extinction risk rather than predicting timing of extinction, the findings function as a warning signal for policymakers rather than a forecast, reinforcing scientists' calls to limit warming to protect reef biodiversity and the ecosystem services reefs provide to over 100 tropical countries.
- 340 of 774 assessed reef-building coral species (44%) are now classified as threatened under IUCN criteria.
- Most risk stems from projected population declines linked to thermal stress from climate change, not direct observation.
- The assessment predates recent record heat and bleaching events, meaning real-world risk may already exceed these estimates.
Source: nature.com — Obura, 2026-10-15
Published there as: “Nearly half of reef-building corals face elevated relative risk of extinction”
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