- published: 15 Feb 2016
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Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine waters that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps. Most reefs grow best in warm, shallow, clear, sunny and agitated waters.
Often called "rainforests of the sea", shallow coral reefs form some of the most diverse ecosystems on Earth. They occupy less than 0.1% of the world's ocean surface, about half the area of France, yet they provide a home for at least 25% of all marine species, including fish, mollusks, worms, crustaceans, echinoderms, sponges, tunicates and other cnidarians.Paradoxically, coral reefs flourish even though they are surrounded by ocean waters that provide few nutrients. They are most commonly found at shallow depths in tropical waters, but deep water and cold water corals also exist on smaller scales in other areas.
Barrier reef may refer to:
The Great Barrier Reef is the world's largest coral reef system composed of over 2,900 individual reefs and 900 islands stretching for over 2,300 kilometres (1,400 mi) over an area of approximately 344,400 square kilometres (133,000 sq mi). The reef is located in the Coral Sea, off the coast of Queensland, Australia.
The Great Barrier Reef can be seen from outer space and is the world's biggest single structure made by living organisms. This reef structure is composed of and built by billions of tiny organisms, known as coral polyps. It supports a wide diversity of life and was selected as a World Heritage Site in 1981.CNN labelled it one of the seven natural wonders of the world. The Queensland National Trust named it a state icon of Queensland.
A large part of the reef is protected by the Great Barrier Reef Marine Park, which helps to limit the impact of human use, such as fishing and tourism. Other environmental pressures on the reef and its ecosystem include runoff, climate change accompanied by mass coral bleaching, and cyclic population outbreaks of the crown-of-thorns starfish. According to a study published in October 2012 by the Proceedings of the National Academy of Sciences, the reef has lost more than half its coral cover since 1985.
Great Barrier may refer to:
A reef is a bar of rock, sand, coral or similar material, lying beneath the surface of water. Reefs may be up to 261 feet (80 m) below the surface.
Many reefs result from abiotic processes—deposition of sand, wave erosion planing down rock outcrops, and other natural processes—but the best-known reefs are the coral reefs of tropical waters developed through biotic processes dominated by corals and calcareous algae. Artificial reefs such as shipwrecks are sometimes created to enhance physical complexity on generally featureless sand bottoms in order to attract a diverse assemblage of organisms, especially fish.
There is a variety of biotic reef types, including oyster reefs, but the most massive and widely distributed are tropical coral reefs. Although corals are major contributors to the framework and bulk material comprising a coral reef, the organisms most responsible for reef growth against the constant assault from ocean waves are calcareous algae, especially, although not entirely, species of coralline algae.
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Few biological wonders can rival those in Australia’s Great Barrier Reef for spectacular beauty, and few filmmakers can rival National Geographic’s lush photography. The giant colonial organism, though endangered by pollution and other threats, still spawns once each year in a gorgeous frenzy of new growth. It’s a fertile time for all of the creatures dwelling in and around the reef structure, and the National Geographic cameras capture barracuda, bright damselfish, giant marine worms, and many other lovely and fascinating neighbours.
Come learn about the amazing creatures that inhabit the coral reefs and how to protect them! We'll see sharks and sea turtles, parrotfish, eels, octopus, clownfish, anemone and more in this fun, kid-friendly adventure full of facts about the coral reef. FreeSchool is great for kids! Have you ever wondered what coral is made of? Or where the sand on the beach comes from? Why don't clownfish get stung when they go in the sea anemone? Come find out! Subscribe to FreeSchool: https://www.youtube.com/user/watchfreeschool?sub_confirmation=1 Visit us on Facebook: https://www.facebook.com/watchFreeSchool Check our our companion channel, FreeSchool Mom! https://www.youtube.com/channel/UCTcEtHRQhqiCZIIb77LyDmA And our NEW channel for little ones, FreeSchool Early Birds! https://www.youtube.com/c...
CORAL REEF AQUARIUM COLLECTION • 12 HOURS • BEST RELAX MUSIC • SLEEP MUSIC • 1080p HD #2 ★► Follow on Spotify・https://goo.gl/s0li3H ★► Subscribe Today!・http://goo.gl/pRRlja YOU CAN FIND MY MUSIC ON: ★► iTunes: https://goo.gl/O3b6W0 ★► Spotify: https://goo.gl/s0li3H ★► Google Play: https://goo.gl/Gr4Ufc ★► Amazon: https://goo.gl/jaqXlF ★★ Music Store: https://sellfy.com/cattrumpetmusic SOCIALS: ★► Follow on Facebook: http://facebook.com/cattrumpet ★► Follow on Twitter: https://twitter.com/cattrumpetmusic ★► Follow on Instagram: https://instagram.com/cattrumpetmusic ★► Follow on Tumblr: http://cat-trumpet-music.tumblr.com ★► Follow on SoundCloud: http://soundcloud.com/cattrumpetmusic MY OTHER CHANNEL: ►► Subscribe to my ASMR Channel: https://goo.gl/6klf4Q ▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂▂ BECOME ...
Coral bleaching is the biggest threat to the Great Barrier Reef. But it's too early for obituaries. Start your Audible 30-day free trial at http://www.audible.com/vox Subscribe to our channel! http://goo.gl/0bsAjO Vox.com is a news website that helps you cut through the noise and understand what's really driving the events in the headlines. Check out http://www.vox.com to get up to speed on everything from Kurdistan to the Kim Kardashian app. Check out our full video catalog: http://goo.gl/IZONyE Follow Vox on Twitter: http://goo.gl/XFrZ5H Or on Facebook: http://goo.gl/U2g06o
"Life On The Coral Reef" video, the footage and images from 16 dives from my Cozumel diving trip compiled in this 30 minutes video. Royalty Free music by Kevin MacLeod (incompetech.com) Fluidscape As always, thanks for watching! Please, support my channel, leave Likes and comments!
Coral reefs in the Caribbean are slowly dying! It's estimated that ⅙ of the reefs will be dead in the next 20 years! What is the purpose of these reefs, and can this damage be stopped? Follow DNews on Twitter: http://www.twitter.com/dnews Follow Trace on Twitter: http://www.twitter.com/tracedominguez Read More: What species live in and around coral reefs? http://oceanservice.noaa.gov/facts/coral_species.html "Hidden beneath the ocean waters, coral reefs teem with life. Fish, corals, lobsters, clams, seahorses, sponges, and sea turtles are only a few of the thousands of creatures that rely on reefs for their survival." How do coral reefs protect lives and property? http://oceanservice.noaa.gov/facts/coral_protect.html "The coral reef structure buffers shorelines against wave...
The Great Barrier Reef is nature’s greatest gift to Australia. It is a mosaic alive with diversity with over 4,000 coral reefs, cays and islands and is home to thousands of species. The Great Barrier Reef is a living treasure to be cherished, respected and protected, for now and into the future. WATCH OUR FAVOURITE GREAT BARRIER REEF VIDEOS 1. A Family Holiday on the Great Barrier Reef: https://www.youtube.com/watch?v=pBwsX6eJPiI 2. Learn why the Great Barrier Reef is a World Heritage Site: https://www.youtube.com/watch?v=ElDA_TkifWo 3. Great Barrier Reef Facts: https://www.youtube.com/watch?v=2d5VdQzAC_Y 4. Snorkelling with Minke Whales: https://www.youtube.com/watch?v=cYLkgkNXDYE 5. The Best Dive Sites on the Great Barrier Reef: https://www.youtube.com/watch?v=OFtapxE2fTE Experience ...
The largest living structure, the Great Barrier Reef spans more than 1,200 miles (2,000 km) of islands and submerged reefs. ➡ Subscribe: http://bit.ly/NatGeoSubscribe About National Geographic: National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible. Get More National Geographic: Official Site: http://bit.ly/NatGeoOfficialSite Facebook: http://bit.ly/FBNatGeo Twitter: http://bit.ly/NatGeoTwitter Instagram: http://bit.ly/NatGeoInsta Great Barrier Reef | Exploring Oceans https://youtu.be/wbNeIn3vVKM National Geographic https://www.youtube.com/natgeo
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