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Too much algae -- and too many microbes -- threaten coral reefs
![Fish swimming by a healthy coral reef in the Line Islands in the central Pacific Ocean.](/news/mmg/media/images/IMG1.CreditJenniferSmith_f.jpg)
A healthy coral reef in the Line Islands in the central Pacific Ocean.
Credit: Brian Zgliczynski
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![A degraded reef full of fleshy algae in the Line Islands.](/news/mmg/media/images/IMG2.CreditJenniferSmith_f.jpg)
A degraded reef dominated by fleshy algae in the Line Islands.
Credit: Jennifer Smith
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![Scientist diving to collect microbial samples](/news/mmg/media/images/IMG4.CreditZaferKizilkaya_f.jpg)
Scientist Forest Rohwer collecting microbial samples for further study.
Credit: Zafer Kizilkaya
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![Fleshy algae may soon smother this otherwise healthy coral reef.](/news/mmg/media/images/img5.creditjennifersmith_867bf2b3-9146-439a-8d6d-da68242e1fa4.jpg)
Fleshy algae may soon smother this otherwise healthy coral reef.
Credit: Jennifer Smith
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![A team of divers descending to survey and sample a reef for microbes.](/news/mmg/media/images/IMG6.CreditJenniferSmith_f.jpg)
A team of divers descending to survey and sample a reef for microbes.
Credit: Jennifer Smith
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![Coral with and without fleshy algae.](/news/mmg/media/images/IMG5Alternate.CreditJenniferSmith_f.jpg)
Coral slowly being overgrown by fleshy algae.
Credit: Jennifer Smith
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