Marine Ecosystems

Coral Reefs Facing Catastrophic Bleaching Event

A recent study reveals that over half of the world’s coral reefs experienced moderate to severe bleaching between 2014 and 2017, a period characterized by unprecedented heatwaves. This event, termed the “Third Global Bleaching Event,” saw 51% of reefs affected and 15% suffering significant mortality. Scientists warn that current, even more severe heatwaves, beginning in 2023, are preventing reefs from recovering, leading to accelerating degradation and a potential tipping point for these vital ecosystems. The findings underscore the urgent threat posed by rising ocean temperatures, with future warming likely to cause irreversible damage to coral reefs globally.

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Scientists Solve Mystery of Sea Star Die-Off, Blame Bacteria

Scientists have finally identified the bacteria, *Vibrio pectenicida*, as the cause of the devastating sea star wasting disease that has killed billions of sea stars along the Pacific coast since 2013. After years of research, the bacteria was found in the sea stars’ coelomic fluid. This discovery offers the opportunity to intervene and aid in the recovery of sea star populations, which are vital for maintaining healthy ecosystems, particularly in kelp forests. Researchers are now exploring methods like relocating healthy sea stars, captive breeding, and assessing potential immunity or treatments like probiotics.

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