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Pink crustose algae covers the surface of a rock.
Photo

Encrusting Pink Algae and a Seastar

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spindles of magnified green algae
Article

A Cancer Fighter from the Sea

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Horizontal bands of color represent different species of lichen that have adapted to the conditions at different heights above sea level.
Article

Seaside Lichens

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Seagrasses are flowering plants that can form dense underwater meadows and are an important shallow water habitat.
Overview

Seagrass and Seagrass Beds

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

What is a Sea Vegetable?

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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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Relatively slow moving, juvenile plane-head filefish Monacanthus hispidus (Monacanthidae) travel along with the algae. They pick off and eat small animals as they move around in the rotating sargassum ball. Adult filefish only grow to be about 11
Article

A World Adrift: Life in the Sargassum

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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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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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two mangrove trees in the crashing waves
Overview

Mangroves

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Mangrove roots provide an underwater habitat for many marine species.
Slideshow

Mangroves: Photos of Plants and Animals

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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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