Coral Reefs

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Each month, the Naked Oceans podcast invites a leading marine researcher to pick the "critter of the month" by asking: if you were a marine organism, which one would you be? This month, Dr...
Boring sponges get a bad rap. Their own name betrays them, announcing to the...
Australia’s Great Barrier Reef (or the GBR as it is known to reef aficionados)...
Welcome to Moorea, a tiny, isolated island in the middle of the vast Pacific...

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Sponges are animals that eat tiny food particles as they pump water through their bodies. They are very common on Caribbean coral reefs, and come in all shapes, sizes and colors. There is great variability in their size: some...
Many species of pink coralline algae cover a reef surface in the Southern...
Corals are sedentery animals, so how do they reproduce? One way is sexually...

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Coral reefs are the most diverse of all marine ecosystems. They teem with life, with perhaps one quarter of all ocean...

The Ocean Blog

Several species of deep-sea corals form a garden 165 m (540 ft) below the ocean’s surface off the coast of Alaska’s Aleutian Islands. Explore more in the multimedia feature " Coral Gardens of the...
Overfishing and sedimentation have heavily impacted this reef off the western coast of Guam. More about coral reef ecosystems can be found in our Coral Reefs featured story .
These corals are dead—smothered in sediments and overgrown with algae. The reef is near Komodo Island in Indonesia. More about coral reef ecosystems can be found in our Coral Reefs featured story .
Dr. Amy Baco-Taylor observed corals like these on her first submarine dive to a deep-sea coral bed off the coast of Hawaii. They include primnoids, zoanthids, and Gerardia . The high density and...
For the past week, the Indonesian Biodiversity Research Center (IBRC) diving class of 2012 has seen countless fish in shades of pink, blue, yellow, red, and green darting through corals and the...
“ This moray eel was resting among some hard coral and was mesmerized by my dive lights, making it a very cooperative subject. The moray eel rhythmically opens and closes its mouth to move water...
In the past 30 years, the Great Barrier Reef -- Australia's iconic natural wonder -- has lost half of its coral to a combination of forces. Dr. Nancy Knowlton, Sant Chair of Marine Science at the...
Colorful corals and brittlestars inhabit the Manning Seamount in the Atlantic Ocean, off the coast of New England. Here you can see golden-colored coral (Enallopsamia rostrata), pinkish-brown coral (...
When snorkeling in the Kahekili Herbivore Fisheries Management Area (KHFMA) in West Maui, I keep an eye out for certain kinds of fish. Not the brightest or the biggest, but those herbivores such as...
How do we know what coral reefs looked like hundreds of years ago? Often times, we are simply left wondering. Scientists can get an idea from naturalist recordings, but there are many unknowns and...
The branches of a primnoid coral in the genus Calyptrophora provide a habitat for galathaoid crabs. Learn more about the deep-sea coral reefs in our Deep-sea Corals article .
See a few of the many species of deep-sea corals that have been discovered by scientists just since 2004. Learn about more deep-sea discoveries in our Deep-sea Corals article.
The Oculina deep-sea coral reef at top has not been disturbed by humans—but trawling has devastated the one at bottom. When fishermen trawl, they drag a net along the seafloor, destroying everything...
Corals are sedentery animals, so how do they reproduce? One way is sexually through spawning , when the corals release eggs and sperm into the water (often at the same time due to some sort of...
Tree corals like this Calyptrophora bayer can grow several meters high and resemble brightly colored trees. This deep-sea coral was found 1,683 m (5,522 ft) deep on the Davidson Seamount. See more...
Reef biologists over a certain age are haunted by memories of what glorious places Caribbean reefs once were. In our youth we studied them for all sorts of reasons but scarcely thought about reef...
Smithsonian zoologist Dr. Steve Cairns named and described this deep-sea coral species, Stephanocyathus paliferus, which is now preserved in the collections of the National Museum of Natural History...
Nestled among the beautiful coral reefs of Papua New Guinea (PNG) is a place that could provide the key to our understanding of one of the biggest threats to coral reef survival: Ocean Acidification...
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