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Part of situation: Climate change impacts on marine ecosystems (3 clusters)

IUCN study: 44% of reef-building corals face extinction risk

coral reef extinction climate change marine biodiversity ocean warming IUCN Red List

A study published in the journal Nature by the International Union for Conservation of Nature (IUCN) reveals that 44% of evaluated reef-building coral species are at risk of extinction due to climate change.

The assessment analyzed 774 species with sufficient data from a total of 892 species on the IUCN Red List. Of these, 340 species are categorized as being at risk: 33 are critically endangered, 251 are endangered, and 56 are vulnerable. This marks a significant decline from 2008, when approximately one-third of these corals were considered threatened.

Experts identify ocean warming, marine heatwaves, and bleaching episodes as the primary drivers of this deterioration. These processes cause thermal stress, leading corals to expel the symbiotic algae necessary for their energy and color. The study notes that the actual number of threatened species may be even higher, as the assessment was completed prior to the intense ocean heatwaves recorded between 2023 and 2025.

Entities

CORDIO East Africa · David Obura · International Union for Conservation of Nature · Nature

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Sources

Calentamiento global pone en riesgo al 44% de los corales y la biodiversidad marina [www.losprimeros.tv]
El 44% de los corales constructores de arrecifes está en riesgo de extinción por el cambio climático | Maya Comunicación [mayacomunicacion.com.mx]
Cambio climático amenaza al 44% de los corales y pone en riesgo arrecifes del planeta [tribunademexico.com]
El cambio climático y las olas de calor marinas amenazân al 44 % de las especies de arrecifes de coral | Noticias 24 horas [www.noticias24hrs.com.ve]