Coral reefs bleach under extreme heat

Discussion in 'Environment' started by Chris, Sep 21, 2010.

  1. Chris
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    Chris Gold Member

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    This year’s extreme heat is putting the world’s coral reefs under such severe stress that scientists fear widespread die-offs, endangering not only the richest ecosystems in the ocean but also fisheries that feed millions of people.

    From Thailand to Texas, corals are reacting to the heat stress by bleaching, or shedding their color and going into survival mode. Many have already died, and more are expected to do so in coming months. Computer forecasts of water temperature suggest that corals in the Caribbean may undergo drastic bleaching in the next few weeks.

    What is unfolding this year is only the second known global bleaching of coral reefs. Scientists are holding out hope that this year will not be as bad, over all, as 1998, the hottest year in the historical record, when an estimated 16 percent of the world’s shallow-water reefs died. But in some places, including Thailand, the situation is looking worse than in 1998.

    http://www.nytimes.com/2010/09/21/science/earth/21coral.html
     
    • Agree Agree x 1
  2. waltky
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    waltky Wise ol' monkey Supporting Member

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    Global warming causing damage to coral reefs...
    :eek:
    UN: Global Warming Harms Corals Vital to Small Islands
    June 05, 2014 — Global warming is causing trillions of dollars of damage to coral reefs, aggravating the risks to tropical small island states as sea levels rise, according to a United Nations report released Thursday.
     
  3. skookerasbil
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    skookerasbil Gold Member

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    Oh Gawd.......

    Can somebody please find something for this idiot to do..........this is like me posting up a thread about finding a spot on the back of my bald head.:D
     
    Last edited: Jun 6, 2014
  4. jc456
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    jc456 Gold Member Gold Supporting Member Supporting Member

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    So, not to be an ass, but why is it we don't see a picture of unhealthy coral since it is such a probelm. Nice to see the beautiful color of the one provided. Don't see any issue with that one. So please, could you add a post with a dying coral picture? I'd like to see what it looks like.
     
  5. mamooth
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    mamooth Gold Member Supporting Member

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    From Wikipedia, bleached coral up front, same species of healthy coral behind.

    [​IMG]
     
  6. flacaltenn
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    flacaltenn USMB Mod Staff Member Gold Supporting Member

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    Show me the graphs of the water temps that did this.. Was it a 0.5degC difference? The normal shallow water system on a reef already has a natural DAILY and YEARLY variation of 3 to 6 degC..

    This is more panic producing speculation..
     
  7. waltky
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    waltky Wise ol' monkey Supporting Member

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    Coral reef restoration in the Philippines...

    With Reefs Under Threat, Philippines Plants Coral Colonies
    March 01, 2016 — Devastated coral reefs in the Philippines are sparking an effort to have people rebuild the underwater ecosystems with putty, nails and ‘Filipinnovation’.
     
  8. jc456
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    jc456 Gold Member Gold Supporting Member Supporting Member

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    but dude/dudette, why isn't all the coral bleached?
     
  9. Old Rocks
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    Old Rocks Diamond Member

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    2005 – a massive coral bleaching event

    The warm water temperatures caused large-scale coral bleaching as a stress response to the excessive temperatures.

    Bleached corals were effectively starving and susceptible to other stresses including diseases; many died as a result. zx The first coral bleaching was reported from Brazil in the Southern Hemisphere; but it was minor.

    The first bleaching reports in the Caribbean were in June from Colombia in the south and Puerto Rico in the north.

    By July, bleaching reports came in from Belize, Mexico and the U.S. Virgin Islands affecting between 25% and 45% of coral colonies.

    By August, the bleaching extended to Florida, Puerto Rico, the Cayman Islands, the northern Dutch Antilles (St. Maarten, Saba, St. Eustatius), the French West Indies (Guadeloupe, Martinique, St. Barthelemy), Barbados and the north coasts of Jamaica and Cuba.

    Bleaching in these countries was generally severe affecting 50% to 95% of coral colonies.

    In some countries (e.g. Cayman Islands) it was the worst bleaching ever seen.

    By September, bleaching affected the south coast of Jamaica and the Dominican Republic, with 68% of corals affected;

    By October, Trinidad and Tobago was reporting 85% bleaching, and the development of a second HotSpot was causing the most severe bleaching for the last 25 years; some places reported 100%, although it was highly variable between sites;

    By November, minor bleaching also affected Venezuela, Guatemala and the Dutch islands of Bonaire and Curacao, affecting 14% to 25% of corals.

    In many countries (Cuba, Jamaica, Colombia, Florida, USA) there was great variation in bleaching between sites. In Florida, areas exposed to regular large temperature fluctuations, and nutrient and sediment loads were less affected. In the French West Indies, the variation was attributed to different species composition between sites.

    ftp://152.19.240.127/pub/marine/brunoj/Bleaching%20papers%20for%20NCEAS%203/Caribbean_Status_Report_2005.pdf

    From the 2005 coral bleaching event in the Caribbean.
     
  10. elektra
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    elektra Gold Member

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    From the science of moot, wiki posts, how about a blog post next.
     

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