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Fish swimming in waters of Bay Islands, Honduras
Article

Improving Grades for the Mesoamerican Reef

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Algae has overtaken this coral reef off heavily populated Kiritimati, or Christmas Island.
Photo

Unhealthy Coral Reef, Kiritimi, Line Islands

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Intense volcanic CO2 vents in Ili Ili Bua Bua, Normanby Island, Papua New Guinea.
Slideshow

Will Coral Reefs Survive Acidification?

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
Article

Coralline Algae: The Unsung Architects of Coral Reefs

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Two nurse sharks hover over a baited cage
Lesson Plan

In Hot Water

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Convict surgeonfish are the roaming sheep of the reef but, instead of noshing on grass, they feed on algae.
Article

Helpful Herbivores

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Close-up photograph of translucent coral polyps, showing the symbiotic algae living inside.
Slideshow

Zooxanthellae and Coral Bleaching

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
Photo

Pink Coralline Algae

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Where the pH is the lowest, corals can no longer grow - sand, rubble and seagrasses replace the reef.
Photo

Lonely Seagrass in Acidic Waters

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A sunset over Boston Harbor.
Article

Signs of a Recovering Harbor

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Pink crustose algae covers the surface of a rock.
Article

Microbes Help Corals Pick a Home and Settle Down

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In some reefs, small fishes such as this broad-barred goby protect corals by eating invading seaweeds.
Photo

Coral Goby Cleans Coral

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