拯救珊瑚礁于濒危边缘-凯发k8官网

拯救珊瑚礁于濒危边缘
文章来源:未知 文章作者:enread 发布时间:2013-09-04 08:06 字体: [ ] 
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shocks caused by climate and 1 change could be used to aid recovery of some of the world's badly-degraded coral reefs, an international team of scientists has proposed. a new report by australian and swedish 2 scientists in the journal frontiers in ecology and the environment suggests that it may be possible to restore living coral cover to a badly-degraded reef system -- though not easy.
 
with 70 per cent or more of the world's coral reefs now assessed as degraded, adopting a business-as-usual approach to how we use and manage reefs is no longer an option, says lead author of the report nick graham.
 
"we are unlikely to be able to keep many of the world's reefs in a 3(原始的) state, but with good management we may be able to maintain them in a coral-dominated condition and in some cases we may be able to bring back reefs from a degraded state," he explains.
 
the researchers have taken heart from examples on land in desertified landscapes; exceptional falls of rain, in combination with controls on grazing pressure, can result in widespread regrowth of natural vegetation.
 
they argue that coral reef managers may be able to take advantage of shocks like tropical storms, periods of cloudy weather or even strong seasonal effects on abundance to restore coral cover on degraded reefs.
 
"normally we think of these shocks as damaging to coral reefs -- but research suggests they are just as damaging to the organisms that can replace coral. in other words, they may act as a circuit-breaker that allows corals to 4 control of a reef."
 
the key to the new thinking is resilience: healthy corals reefs are naturally resilient to shocks -- but damaged ones may become overgrown with sea weeds, and the corals vanish.
 
"weed-dominated systems are pretty resilient too and, once established, it is very hard to restore the corals," dr graham explains.
 
"however a weed-dominated reef can be damaged by big storms too. cloudy weather and seasonal changes in water temperature can also cause the weeds to die back.
 
"this dieback(顶梢枯死) of weeds opens a window through which corals can re-establish."


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1 lz1xe     
adj.季节的,季节性的
参考例句:
  • the town relies on the seasonal tourist industry for jobs.这个城镇依靠季节性旅游业提供就业机会。
  • the hors d'oeuvre is seasonal vegetables.餐前小吃是应时蔬菜。
2 77izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • when the war broke out,he volunteered for the marine corps.战争爆发时,他自愿参加了海军陆战队。
3 5bqyc     
adj.原来的,古时的,原始的,纯净的,无垢的
参考例句:
  • he wiped his fingers on his pristine handkerchief.他用他那块洁净的手帕擦手指。
  • he wasn't about to blemish that pristine record.他本不想去玷污那清白的过去。
4 ykyzpd     
vt.重新获得,收复,恢复
参考例句:
  • he is making a bid to regain his world no.1 ranking.他正为重登世界排名第一位而努力。
  • the government is desperate to regain credibility with the public.政府急于重新获取公众的信任。
tag标签: coral climate reefs
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