阳光能降低金藻毒性
文章来源:未知 文章作者:enread 发布时间:2011-06-16 03:20 字体: [ ]  进入论坛
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A new Baylor University study has found that sunlight decreases the toxicity2 of golden algae3(金藻) , which kills millions of fish in the southern United States every year. While golden algae is primarily a coastal4 species, it has been found in Texas rivers and lakes, including Lake Whitney and Lake Waco in Central Texas, and Lake Granbury in North Texas. Experts believe that several environmental factors influence toxin5 production, but new research from Baylor scientists shows that sunlight is a key component6 in the magnitude and duration of the toxicity of the algae to fish. Specifically, the study found that the longer golden algae toxins7 are exposed to natural sunlight, the less toxic1 the algal toxin becomes to fish and other aquatic8(水生的) organisms.

"What we think happens in terms of the large fish kills is that sunlight only penetrates9 down so deep in a lake, so in a lake with golden algae blooms, fish located at greater depths may be exposed to more algal toxins," said study co-author Dr. Bryan Brooks10, associate professor of environmental sciences and biomedical studies at Baylor and director of the environmental health sciences program. "Golden algae is aggressive and very unique because it can produce its own toxins, swim, photosynthesize(光能合成) and feed on other organisms. If we can figure out what stimulates11 and decreases the growth of this algae, we might be able to control it."

Along the Brazos River in north and central Texas, at least seven-million fish have been killed since 1988 due to high golden algae levels, according to Texas Parks and Wildlife. In fact, in 2005 more than a million fish died in Lake Whitney over a three-month period. Officials believe large golden algae blooms contributed to the deaths, attacking the fishes' gills and causing them to suffocate12(压制,受阻) .

The study appears on-line in the Journal of Plankton13 Research.



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1 toxic inSwc     
adj.有毒的,因中毒引起的
参考例句:
  • The factory had accidentally released a quantity of toxic waste into the sea.这家工厂意外泄漏大量有毒废物到海中。
  • There is a risk that toxic chemicals might be blasted into the atmosphere.爆炸后有毒化学物质可能会进入大气层。
2 toxicity InYwc     
n.毒性,毒力
参考例句:
  • The hoarse grunt or squeal is characteristic of toxicity.嘶哑的哼声和叫声是中毒的特征。
  • Dieldrin is related to aldrin,and its toxicity to earthworms is similar.狄氏剂与艾氏剂有关,对蚯蚓的毒性是相似的。
3 algae tK6yW     
n.水藻,海藻
参考例句:
  • Most algae live in water.多数藻类生长在水中。
  • Algae grow and spread quickly in the lake.湖中水藻滋蔓。
4 coastal WWiyh     
adj.海岸的,沿海的,沿岸的
参考例句:
  • The ocean waves are slowly eating away the coastal rocks.大海的波浪慢慢地侵蚀着岸边的岩石。
  • This country will fortify the coastal areas.该国将加强沿海地区的防御。
5 toxin hn5wb     
n.毒素,毒质
参考例句:
  • Experts have linked this condition to a build-up of toxins in the body.专家已把这一病症与体内毒素的积累联系起来。
  • Tests showed increased levels of toxin in shellfish.检验表明水生有壳动物的毒素水平提高了。
6 component epSzv     
n.组成部分,成分,元件;adj.组成的,合成的
参考例句:
  • Each component is carefully checked before assembly.每个零件在装配前都经过仔细检查。
  • Blade and handle are the component parts of a knife.刀身和刀柄是一把刀的组成部分。
7 toxins 18c3f40d432ba8dc33bad8fb82873ea8     
n.毒素( toxin的名词复数 )
参考例句:
  • The seas have been used as a receptacle for a range of industrial toxins. 海洋成了各种有毒工业废料的大容器。
  • Most toxins are naturally excreted from the body. 大部分毒素被自然排出体外。 来自《简明英汉词典》
8 aquatic mvXzk     
adj.水生的,水栖的
参考例句:
  • Aquatic sports include swimming and rowing.水上运动包括游泳和划船。
  • We visited an aquatic city in Italy.我们在意大利访问过一个水上城市。
9 penetrates 6e705c7f6e3a55a0a85919c8773759e9     
v.穿过( penetrate的第三人称单数 );刺入;了解;渗透
参考例句:
  • This is a telescope that penetrates to the remote parts of the universe. 这是一架能看到宇宙中遥远地方的望远镜。 来自《简明英汉词典》
  • The dust is so fine that it easily penetrates all the buildings. 尘土极细,能极轻易地钻入一切建筑物。 来自辞典例句
10 brooks cdbd33f49d2a6cef435e9a42e9c6670f     
n.小溪( brook的名词复数 )
参考例句:
  • Brooks gave the business when Haas caught him with his watch. 哈斯抓到偷他的手表的布鲁克斯时,狠狠地揍了他一顿。 来自《简明英汉词典》
  • Ade and Brooks exchanged blows yesterday and they were severely punished today. 艾德和布鲁克斯昨天打起来了,今天他们受到严厉的惩罚。 来自《简明英汉词典》
11 stimulates 7384b1562fa5973e17b0984305c09f3e     
v.刺激( stimulate的第三人称单数 );激励;使兴奋;起兴奋作用,起刺激作用,起促进作用
参考例句:
  • Exercise stimulates the body. 运动促进身体健康。 来自《简明英汉词典》
  • Alcohol stimulates the action of the heart. 酒刺激心脏的活动。 来自《现代英汉综合大词典》
12 suffocate CHNzm     
vt.使窒息,使缺氧,阻碍;vi.窒息,窒息而亡,阻碍发展
参考例句:
  • If you shut all the windows,I will suffocate.如果你把窗户全部关起来,我就会闷死。
  • The stale air made us suffocate.浑浊的空气使我们感到窒息。
13 plankton B2IzA     
n.浮游生物
参考例句:
  • Plankton is at the bottom of the marine food chain.浮游生物处于海洋食物链的最底层。
  • The plankton in the sea feeds many kinds of animals. 海的浮游生物成为很多种动物的食物。
TAG标签: sunlight fish algae
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