www射-国产免费一级-欧美福利-亚洲成人福利-成人一区在线观看-亚州成人

您現在的位置: Language Tips> Audio & Video> Special Speed News  
 





 
Finding ways to deal with harmful algae
[ 2007-12-11 10:25 ]

Download

This is the VOA Special English Agriculture Report.

In the sea, at the base of what scientists call the food web, are single-celled plants. These microscopic algae provide the energy for the web that feeds higher forms of life.

Algae-affected waters in Hong Kong's Victoria Harbor in June, after a harmful bloom near the southern Chinese city of Shenzhen Algae-affected waters in Hong Kong's Victoria Harbor in June, after a harmful bloom near the southern Chinese city of Shenzhen Under some conditions, algae suddenly begin to spread very quickly, an event known as a bloom. Usually blooms are not harmful. But some kinds of algae produce poisons. These toxins can be deadly to sea animals and also dangerous to people.

When algae bloom, they can discolor the water as they form dense areas near the surface. You may have heard the term "red tide." But experts at the Woods Hole Oceanographic Institute in Massachusetts say this is incorrect.

Blooms are not connected with tides. And they not always red -- the water can appear brown or greenish. And, in fact, some algae can be harmful without discoloring the water.

So instead of "red tide," scientists use the term "harmful algal (al-ghul) bloom." Algal is the adjective form of alga, a single plant. But they also just say HAB for short.

The toxins can very quickly kill fish, such as herring and anchovies, that feed on algae. But even if they survive they can be dangerous to eat. Not only that, bigger fish that eat the algae-eaters may also be dangerous.

Some toxins harm only sea life. But others can cause severe stomach and intestinal problems as well as neurological disorders and even death in people. The only way to know if these toxins are present, unless people get sick, is through laboratory testing of fish and shellfish.

Experts say the meaty or hard muscle parts of shrimp, crab, scallops and lobster are safe to eat because they do not absorb the poison. But people should not to eat the liver or other organs or soft tissues. Also, people should not eat other kinds of shellfish during a HAB. These include oysters, clams, mussels and whelks.

In the United States, the government says harmful algal blooms cause more than eighty million dollars in economic losses each year. A government report in July noted that HABs are widely believed to be increasing worldwide.

The report was the first step in a process to create a plan for predicting and dealing with them in American waters. In Florida, for example, satellites and computer models are now being used to provide algae forecasts that are just like weather reports.

And that’s the VOA Special English Agriculture Report, written by Jerilyn Watson. For links to more information about harmful algae, go to voaspecialenglish.com. I’m Steve Ember.

(Source: VOA 英語點津姍姍編輯)

 
 
相關文章 Related Stories
 

 

 

 
 

本頻道最新推薦

     
  Finding ways to deal with harmful algae
  Putin names Medvedev as favored successor
  2nd phase of Olympic ticket sales begins
  《叢林大反攻》精講之三
  The princess diaries

論壇熱貼

     
  國有國法 家有家規 in english?
  交通道路里的環形路口怎么翻譯
  Make Training a Job Priority
  How to get what you want from anyone
  Does Love at First Sight Really Exist
  Self-Healing Basics




主站蜘蛛池模板: 日本无遮| 办公室紧身裙丝袜av在线 | 久久国产精品亚洲 | 性做久久久久久久免费看 | 亚洲国产成人在线视频 | 在线视频中文字幕 | 日韩欧美一级a毛片欧美一级 | 国产在线观看精品一区二区三区91 | 成人在线观看网址 | 免费精品久久久久久中文字幕 | 在线 | 一区二区三区 | 亚洲看片网 | 手机在线观看a | 国产高清一区二区三区免费视频 | 日韩精品一区二区三区免费视频 | 一区二区不卡久久精品 | 99国产精品热久久久久久夜夜嗨 | 亚洲国产精品日韩高清秒播 | 欧美最爽乱淫视频播放黑人 | 日韩在线观看中文字幕 | 日韩三级免费观看 | 成人影院午夜久久影院 | 中文字幕在线观看日韩 | 99久久综合精品免费 | 黄人成a动漫片免费网站 | 欧美毛片在线 | 美国三级| 国产a国产片国产 | 精品欧美激情在线看 | 日韩欧美在线观看一区 | 日本肥老妇色xxxxx日本老妇 | 国产高清一级视频在线观看 | 欧洲国产伦久久久久久久 | 成人91在线 | 亚洲精品手机在线 | 欧美日韩视频在线第一区 | 欧美xxxx精品另类 | 国产成人精品视频免费大全 | 成人a毛片久久免费播放 | 国产精品自在线天天看片 | 亚洲视频手机在线 |