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Pink crustose algae covers the surface of a rock.
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Encrusting Pink Algae and a Seastar

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Unlike the green, leafy algae we're used to seeing, coralline algae has a hard crust—which you can see here at the molecular level under a scanning electron microscope.
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Coralline Algae Under the Microscope

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

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scientist Drew-Baker reads a book by her microscope
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Mother of Nori

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Kelps are large, brown algae that grow along coasts around the world, especially in cooler regions.
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Kelp Pennant

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

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School of blue rockfish in a kelp bed.
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Stinkin' Seaweed Makes Tasty Food for Coastal Animals

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A newly established black mangrove sits in a field of salt marsh near the northern limit of mangroves in Florida. Mangroves have been expanding near their northern limit in Florida and the expansion is linked to a reduction in the frequency of ex
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Finding Mangroves In Unexpected Places

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Many species of pink coralline algae, which cements coral reefs together, cover a reef surface in the Southern Line Islands.
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Coralline Algae: The Unsung Architects of Coral Reefs

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

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Fish swimming in waters of Bay Islands, Honduras
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Improving Grades for the Mesoamerican Reef

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An algal bloom, also known as a red tide, has converted the ocean's surf to a red color
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Scientists Work to Predict and Prevent Algae Blooms

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