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[自然百科] 2014-09-20 海洋天堂大堡礁:堡礁内外—23

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[自然百科] 2014-09-20 海洋天堂大堡礁:堡礁内外—23

 


动物世界、地球奇观、生命奇迹、未解之谜、人与自然、生态环境 ,参与普特国家地理(自然百科)节目,我们一起认知我们的生存家园.


 

 

   BBC Great Barrier Reef Ep3  Reef And Beyond 

 

《英国广播公司:海洋天堂大堡礁》第3集 堡礁内外


 

大堡礁坐落在澳洲东北海岸,昆士兰州以东,南回归线与巴布亚海之间的南太平洋热带海洋区域,南北长2300 公里,东西宽从20公里到240公里,总面积479万平方公里,平均水深2400米。大堡礁属于珊瑚礁,是由无数的珊瑚虫经过1万5千年的堆积而形成,目前海域内共有700多大小珊瑚岛,分别由 350多种珊瑚构成,堪称世界8大奇观之一。1981年大堡礁被规划为世界遗产而成为澳洲最知名的观光胜地,每年吸引了百万人次的海内外游客来这里观光游览,探索海洋世界的奥妙,领略澳洲奇特的自然风情。
 

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[Homework]2014-09-20 海洋天堂大堡礁:堡礁内外—23

This bleaching occurs because corals can only live in a narrow temperature range, healthy corals get their color from microscopic algae living in their tissues, these manufacture food for the corals by photosynthesis, but when the temperature rises just 2 degrees above the normal summer maximum, the algal cells are expelled because they no longer benefit the coral. The bleaching effect is the white chalky skeleton showing through the coral's transparent tissues, but they are not dead, not yet, they can survive in this bleach state for several weeks, if the temperature drops, the corals aquire new algae from plankton floating by, but if the warm water persists, the coral dies. Coral bleaching hadn't been seen on the great barrier reef before the 1980s, due to global warming, bleaching is now more common, and cyclones are likely to be more frequent too, and there is something even more insidious, temperature is rising because more and more carbon dioxide from human activity enters the atmosphere, this dissolves in sea water turning acidic which can stop coral growth, if they can't build their chalky skeletons, reefs will start to crumble.
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This bleaching occurs because the coral can only live in a narrow temerature range. Healthy corals get their colour from the microscopic algae living in their tissues.This manufactures food for the corals by photosynthesis.But when the temperature rises just 2 degrees above the normal summer maxiam,the algo cells are expelled because they no longer benefit the coral.The bleaching effect is the white chalky skeleton showing through the corals transparent tissues.But they are not dead,not yet,they can survive in this bleaching state for several weeks.If the temperature drops, the corals aquire new algae from plankton floating by.But if the warm water persists,the coral dies.Coral bleaching hadn't been seen on the Great Barrier Reef before the 1980s.Due to global warming,bleachings now more common and cyclones are likely to be more frequent too. And something even more insidious.Temperature are rising because more and more co2 from  human activity enters the atmoshphere.This dissolves in the sea water,turning it a weakly acidic which can stop the coral growth.If they can't build their chalky sketons,reef swell will start to crumble.
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this bleaching occurs because coral can only live in a narrow temperature range,
health corals get their color from microscopic algae living in their tissues, these
manufacture food for the corals by photosynthesis, when the temperature rises just
2 degrees above the normal summer maximum, the algae cells are expelled becasue they
no longer benefit the coral, the bleaching effect is the white chalky skeleton showing
fews of the coral's transparent tissue, but they are not dead, not yet, they can survive
in this bleaching state for several weeks, if  the temperature drops, the corals
acquire new algae from plankton flowing by, but if the warm water persists, the coral
dies.

coral bleaching hadn't been seen on the great barrier reef before 1980s, due to global
warming, bleaching is now more common, and cyclones are likely to be more frequent too,
and there is something even more in cydies, temperature's rising because more and more
carbon dioxide from human activies enters the atmosphere, this dissolve in sea water
turning it a weakly acidic which can stop coral growth, if they can't build their
chalky skeletons, reef will start to crumble
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