A survey of bacteria and archaea living in 99 coral reefs across the Pacific Ocean found these ecosystems may contain more microbes than current estimates for the whole planet – suggesting everywhere else on Earth does too
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A two-year expedition across the Pacific Ocean has revealed that the microbes present on coral reefs there may be as varied as the microbiome of the rest of the planet’s ecosystems combined. This could mean we have vastly underestimated the total microbial diversity on Earth. Coral reefs make up less than 1 per cent of the ocean, yet are home to nearly a third of marine species of animals and plants. An expedition launched in 2016 and led byat the University of Perpignan in France visited 99 reefs across the Pacific Ocean. At each reef, Planes and his colleagues collected seawater and took samples of three species of coral and two species of fish.
They sequenced a key section of DNA from bacteria and archaea present in the samples. Within the roughly 3 billion sequences that resulted, they found more than half a million unique ones, indicating vast microbial diversity. Samples from different parts of the ocean also had distinct microbiomes.
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