Great Barrier Reef microbiome mapped as researchers discover 500 bacterial species previously unknown to science
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- Researchers at the University of Queensland and Australian Institute of Marine Science mapped the Great Barrier Reef's microbiome by analyzing DNA from seawater samples across 48 reefs, documenting an estimated 362,802 distinct viruses and 876 bacterial and archaeal species.
- The study, published in Nature, found that 584 of those 876 bacterial and archaeal species had never been documented before — a finding Prof Philip Hugenholtz, a UQ microbiologist and senior author, said surprised him given that marine ecosystems are among the most sequenced on the planet.
- Dr Yun Kit Yeoh, AIMS senior research scientist and senior author, said many reef microbes photosynthesize and underpin marine food chains by feeding krill and zooplankton that larger animals consume, with most previously unstudiable except by growing them on petri dishes.
- The researchers said the mapped microbiome could serve as a monitoring tool for climate stress, bleaching, heavy metal contamination, and illegal fishing — with shifts in microbial populations often detectable before visible changes appear on the reef.
- The team used long-read sequencing technology to read large strands of DNA at once, an approach Hugenholtz likened to solving jigsaw puzzles with bigger pieces, enabling work that would have been impossible a decade ago due to limited computing power.
Why it matters: The microbiome map gives reef managers a leading indicator of stress: microbial shifts register before bleaching is visible, and microbial community changes can cheaply flag heavy metal contamination and illegal fishing in no-take zones. For a reef under mounting climate pressure, the Nature-published baseline turns an invisible ecosystem into a practical monitoring toolkit.
