The fragile species outlasting the robust in a climate crisis

Nature · Published 29 October 2026 Swipe more like this →

In short: In the face of rising ocean temperatures, nature is defying our expectations. While we expect sturdy, dense structures to survive best, some of the most delicate corals are proving to be the ultimate survivors. This biological reversal offers a surprising blueprint for reef resilience.

At the Tatakoto atoll in French Polynesia, located over 1,000 kilometres from Tahiti, researchers have identified a concentration of 'super corals.' These organisms thrive in a semi-enclosed lagoon that presents an environment hostile to most marine life. The area experiences extreme temperature fluctuations of 3 to 4°C per day, with water temperatures reaching nearly 35°C.

The most striking discovery made by researchers, including Laetitia Hédouin of the CNRS, is a reversal of traditional resilience. Usually, Acropora corals—characterized by fine, branch-like structures and rapid growth—are among the first to bleach and die during heatwaves. In contrast, Pocillopora are typically considered more robust due to their dense, cauliflower-like shapes. However, at Tatakoto, the fragile Acropora survived intense heat in large numbers while outperforming the traditionally hardy species.

This phenomenon suggests that environmental stress might actually be a catalyst for adaptation. Previous studies in Palau corroborated these findings, showing that Acropora from sites with high daily thermal variability exhibited greater thermal tolerance than those in stable environments. This indicates that exposure to significant temperature fluctuations may strengthen the resilience of certain corals, providing a potential lifeline for reef ecosystems that support 25% of all marine life.

The project is part of a broader effort by UNESCO and several laboratories (including Labex Corail, UPF, CRIOBE, SECOPOL, and 1 OCEAN) to understand these mechanisms. By documenting how these corals adapt to oxygen-poor and high-heat conditions, scientists hope to identify ways to protect essential marine biodiversity against the accelerating pressures of climate change.

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