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Overfishing and sedimentation have heavily impacted this reef off the coast of Guam.
Photo

Coral Reef in Distress

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These bleached corals in the Gulf of Mexico are the result of increased water temperatures.
Photo

Bleached Corals

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Many medicines were based on a chemical from the sea sponge Tectitethya crypta.
Photo

From Sea Sponge to HIV Medicine

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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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A zoomed-in image of the crown-of-thorns sea star.
Article

A Plague of Sea Stars

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A bluefin trevally swims in Hawaii’s Maro Coral Reef, part of the Papahānaumokuākea Marine National Monument.
Slideshow

Two Views of Coral Reefs: Thriving and Threatened

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Corals, sponges, and algae are the major components of most coral reef communities as shown in this picture.
Overview

Corals and Coral Reefs

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