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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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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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Sargassum forms dense clumps up to the size of a beach ball that slowly rotate as they drift.
Article

Too Much of a Good Thing—the Atlantic Sargassum Belt

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Screenshot of "Investigating Nutrient Pollution's Impact on Mangroves" showing a boat heading into the mangroves.
Video

Investigating Nutrient Pollution's Impact on Mangroves

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Algae covers beds of seagrass.
Photo

Algae-covered Seagrass in Tampa Bay

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An Australian Giant Cuttlefish (Sepia apama) crosses a seagrass bed.
Photo

Cuttlefish in Seagrass Bed

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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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A bloom of algae from up above
Article

What Exactly Is a Red Tide?

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Harbor seal in a kelp forest near Cortes Bank, near San Diego California.
Photo

Harbor Seal in a Kelp Forest

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A brown-colored deep-sea coral sits on the deep ocean floor and is covered with brown oil floc.
Photo

Anemone On Deep Sea Coral

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A close-up photo of Killer Algae, Caulerpa taxifolia, a seaweed that has proven to be a successful invasive species.
Photo

Killer Algae (Caulerpa taxifolia)

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