影响加勒比海珊瑚礁生长的因素-凯发k8官网

影响加勒比海珊瑚礁生长的因素
文章来源:未知 文章作者:enread 发布时间:2013-01-30 07:21 字体: [ ] 
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coral reefs build their structures by both producing and accumulating 1 carbonate, and this is essential for the maintenance and continued 2(垂直的) growth capacity of reefs. an international research team has discovered that the amount of new carbonate being added by caribbean coral reefs is now significantly below rates measured over recent geological timescales, and in some habitats is as much as 70% lower. coral reefs form some of the planet's most biologically diverse 3, and provide valuable services to humans and wildlife. however, their ability to maintain their structures and continue to grow depends on the balance between the addition of new carbonate, which is mostly produced by corals themselves, set against the loss of carbonate through various erosional(侵蚀) processes. scientists have long known that reef ecosystems are in decline and that the amount of live coral on reefs is 4. but the paper, published on date tbc in nature communications, is the first evidence that these 5 changes are now also impacting on the growth potential of reefs themselves.
 
professor chris perry of the university of exeter, who led the research, said: "our estimates of current rates of reef growth in the caribbean are extremely alarming. our study goes beyond only examining how much coral there is, to also look at the delicate balance of biological factors which determine whether coral reefs will continue to grow or will 6. our findings clearly show that recent ecological declines are now suppressing the growth potential of reefs in the region, and that this will have major implications for their ability to respond 7 to future sea level rises.
 
"it is most concerning that many coral reefs across the caribbean have seemingly lost their capacity to produce enough carbonate to continue growing 8, whilst others are already at a threshold where they may start to erode. at the moment there is limited evidence of large-scale erosion or loss of actual reef structure, but clearly if these trends continue, reef erosion looks far more likely. urgent action to improve management of reef habitats and to limit global temperature increases is likely to be critical to reduce further 9 of reef habitat."
 
the team was funded by the leverhulme trust (uk), through an international network grant. it included scientists from james cook university and the university of queensland in australia, from the university of auckland in new zealand, memorial university in canada, and the university of maine in the usa. they examined rates of carbonate production across 19 reefs in the four caribbean countries of the bahamas, belize, bonaire and grand cayman.


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1 sndzy     
n.钙(化学符号ca)
参考例句:
  • we need calcium to make bones.我们需要钙来壮骨。
  • calcium is found most abundantly in milk.奶含钙最丰富。
2 ziywu     
adj.垂直的,顶点的,纵向的;n.垂直物,垂直的位置
参考例句:
  • the northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
  • vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。
3 94cb0e40a815bea1157ac8aab9a5380d     
n.生态系统( ecosystem的名词复数 )
参考例句:
  • there are highly sensitive and delicately balanced ecosystems in the forest. 森林里有高度敏感、灵敏平衡的各种生态系统。 来自《简明英汉词典》
  • madagascar's ecosystems range from rainforest to semi-desert. 马达加斯加生态系统类型多样,从雨林到半荒漠等不一而足。 来自辞典例句
4 f139f57690cdca2d2214f172b39dc0b9     
adj.逐渐减少的v.逐渐变少或变小( dwindle的现在分词 )
参考例句:
  • the number of wild animals on the earth is dwindling. 地球上野生动物的数量正日渐减少。 来自《简明英汉词典》
  • he is struggling to come to terms with his dwindling authority. 他正努力适应自己权力被削弱这一局面。 来自辞典例句
5 irrxx     
adj.生态的,生态学的
参考例句:
  • the region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • each animal has its ecological niche.每种动物都有自己的生态位.
6 nmuyx     
v.侵蚀,腐蚀,使...减少、减弱或消失
参考例句:
  • once exposed,soil is quickly eroded by wind and rain.一旦暴露在外,土壤很快就会被风雨侵蚀。
  • competition in the financial marketplace has eroded profits.金融市场的竞争降低了利润。
7 vptxw     
adv.明确地,断然,坚决地;实在,确实
参考例句:
  • she was positively glowing with happiness.她满脸幸福。
  • the weather was positively poisonous.这天气着实讨厌。
8 sfmzyg     
adv.垂直地
参考例句:
  • line the pages for the graph both horizontally and vertically.在这几页上同时画上横线和竖线,以便制作图表。
  • the human brain is divided vertically down the middle into two hemispheres.人脑从中央垂直地分为两半球。
9 yvvxj     
n.退化;恶化;变坏
参考例句:
  • mental and physical deterioration both occur naturally with age. 随着年龄的增长,心智和体力自然衰退。
  • the car's bodywork was already showing signs of deterioration. 这辆车的车身已经显示出了劣化迹象。
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