Mangrove forests mitigate coral bleaching under thermal stress from climate change
Johnson, J.; Dick, J.; Pincheira-Donoso, D.
Show abstract
Anthropogenic marine heatwaves are progressively degrading coral reef ecosystems worldwide via the process of coral bleaching (the expulsion of photosynthetic endosymbionts which reveals the coral skeleton). Corals from mangrove lagoons are hypothesised to increase resistance and resilience to coral bleaching, highlighting these areas as potential natural refuges for corals. Our study, the first conducted at a global-scale, reveals that coral reefs associated with mangrove forests are less likely to bleach under thermal stress, and thus, under scenarios of climate warming. The onset of severe bleaching occurred after 3.6 Degree Heating Weeks (DHW) in mangrove-associated reefs, compared to 2.23 DHW for non-mangrove associated reefs. These findings highlight the critical role of mangrove forests for coral reef persistence under climate change. Accordingly, conservation actions targeting the protection of mangroves are expected to contribute to the resilience and resistance of reef corals from bleaching as marine heatwaves continue to become more common.
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