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Growing a Giant Clam Posted by: Microdocs
Video duration: 252 seconds Giant clams are increasingly rare on Fijis coral reefs. They are big, brightly colored, unable to run away and tasty. Fijians hope that farming giant clams can help to repopulate reefs by transplanting them onto protected reefs. Once enough calms have been transplanted, they can naturally repopulate the surrounding area. Related: aquaculture, clam, coral, ecology, fiji, giant, makogai, microdocs, reef, sustainability, tridacna |
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Four Kinds of Coral Reef Posted by: Microdocs
Video duration: 193 seconds Tiny coral polyps build the massive structure of the reef. There are 4 main types of coral reef: fringing reef; barrier reef; atoll; and patch reef. As reefs mature, they can develop from fringing reefs to barrier reefs to atolls Related: atoll, barrier, coral, fringing, patch, reef, types |
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Global Warming Posted by: Microdocs
Video duration: 102 seconds Global warming is transforming our environment. The temperature, acidity and water level of the ocean is rising. These changes are increasing in speed and magnitude and their effects will last for centuries. Corals are among those organisms hit hardest by global warming. The rate our climate changes will determine whether coral can survive or not. Related: change, climate, coral, ecology, global, reefs, sustainability, warming |
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Crown-of-Thorns starfish Posted by: Microdocs
Video duration: 160 seconds Hordes of Crown-of-thorns starfish can devour coral reefs. The Crown-of-Thorns starfish (Acanthaster planci) feeds on coral. Low numbers of this starfish increase reef diversity, but large numbers can destroy reefs. Avoiding human activities that increase starfish numbers is more effective than trying to control Crown-of-Thorns outbreaks once they happen. Related: coral, crown-of-thorns, ecology, marine, reef, starfish, sustainability |
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Lifecycle of the conch Posted by: Microdocs
Video duration: 186 seconds Conch are fast growing marine snails that feed on algae. They move from the shallow water into deeper waters as they grow and return to the shallows to lay eggs. Related: conch, coral, diversity, ecology, marine, snail |
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The Solar Powered Clam Posted by: Microdocs
Video duration: 126 seconds Giant calms filter feed like other clams, but they also get food from symbiotic algae. This extra food allows these clams to grow to a massive size. Giant calms are rare in many areas because they are overfished. Related: coral, diversity, ecology, marine, microdocs, mocrodoc, reef |
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Tuna and the can Posted by: Microdocs
Video duration: 120 seconds How do you protect a fish that crisscrosses oceans? The fishers of Pohnpei Island use the feeding patterns of seabirds to spot tuna. Commercial tuna fishers use a modern version of this method - helicopters. Overfishing is putting some tuna populations at risk of collapse. Saving these fish is made more difficult by the great distances these fish swim and the high price they fetch. Related: aggregations, coral, ecology, fish, marine, migratory, reef, tuna |
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City vs Village Fishing Posted by: Microdocs
Video duration: 230 seconds Coral reefs can easily feed villages. Cities are another story. Coral reefs are traditional sources of food on many Pacific Islands. An increasing number of people are moving from villages into cities. Coral reefs near these cities struggle to feed so many people. Marine Protected Areas (MPAs) can help more people to be fed. Related: area, coral, drift, ecology, marine, mpa, overfishing, productivity, protected, reef, sustainability, urban |
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The sea is green Posted by: Microdocs
Video duration: 144 seconds Tropical seas are normally blue. Why is this one green? Many coral reef organisms eat algae, and prevent it from taking over the reef. If one type of herbivore is reduced in numbers other species can often take over and control algae. However, coral reefs that have lost diversity may not have herbivores waiting to take over. These reefs will quickly be smothered by algae. Related: algae, coral, ecology, herbivore, loss, marine, reef, smother, sustainability |
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Life On A Reef Posted by: Microdocs
Video duration: 148 seconds Coral reefs are home to a ¼ of all marine species, yet they cover less that 1/10th of the surface of the worlds oceans. Coral polyps create the conditions necessary to support this level of diversity by building a 3 dimensional structure with many different habitats. Coral reefs provide shelter, food and other resources for millions of species. Related: coral, diversity, ecology, marine |
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Reefs and Resorts Posted by: Microdocs
Video duration: 176 seconds The popularity of coral reefs can threaten its sustainability. Coastal development can damage nearby coral reefs. Construction debris can smother coral and introduce nutrients which encourage weedy algae to take over the reef. These threats are magnified if mangroves or other ecosystems that trap sediment are removed during development. Related: coastal, coral, development, ecology, marine, reef, smother, sustainability |
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Cement in the middle of the ocean Posted by: Microdocs
Video duration: 154 seconds Why cant we have coral reef cement factories? Productivity is a key to sustainability. How fast you can sustainably use a resource depends on how fast its created. An ecosystem becomes unsustainable if we use resources faster than they are made. In theory, cement can be made on islands with coral reefs, but this cant be done sustainably because coral regenerates too slowly. Related: coral, ecological, ecology, marine, productivity, rate, reef, resource, sustainability, use |
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Manta Ray Posted by: Microdocs
Video duration: 67 seconds These enigmatic giants glide through tropical waters filtering the ocean through gaping mouths. Unlike most rays, manta rays swim in open waters filter feeding. Manta rays gather near coral reefs for food and to be cleaned. An even larger species of manta ray has recently been discovered. Related: coral, diversity, ecology, manta, marine, ray, reef |
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Disturbance Posted by: Microdocs
Video duration: 233 seconds Some disturbance can be beneficial, but too much causes ecosystem unsustainability. An avalanche of mud crashes down a hillside, already dotted with the scars of previous slips. Rocks and muddy debris sluice through the village, pushing aside coconut palms and other plants, before plunging into the ocean. How could a disturbance like this be beneficial? Related: coral, disturbance, ecology, marine, sustainability |
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Reef Structure Posted by: Microdocs
Video duration: 103 seconds Wave action creates a series of different habitats on a reef. These habitats help to create diversity. Waves create 3 main zones on a coral reef: Fore reef; reef crest; and reef flat. Related: action, biodiversity, coral, diversity, reefs, structure, wave |