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科学美国人60秒 SSS Having an Albatross around Your Boat

时间:2020-03-10 23:53来源:互联网 提供网友:nan   字体: [ ]
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By outfitting1 169 albatrosses with GPS data loggers, scientists were able to track fishing boats apparently2 trying to hide their location. Christopher Intagliata reports.

Full Transcript3 

If you’ve ever been on a fishing boat, you’ve probably seen flocks of birds following in your wake, hoping to catch a snack. Now scientists say they can use those birds’ behavior to track illegal fishing boats.

Here’s how it works: Researchers attached data loggers to the backs of 169 albatrosses in the Southern and Indian oceans. The devices weighed only an ounce and a half, but they included a GPS—which enabled them to detect the presence and intensity4 of radar5 signals emanating6 from boats. That information was then transmitted by satellite, so the researchers could track the location of the birds—and thus the radar-emitting boats—in real time.

The scientists then cross-checked that data against the known locations of boats, gleaned7 from a system boats use to declare themselves, called the Automatic Identification System. And discrepancies8 appeared frequently.

More than a third of the times the birds’ loggers’ detected radar signals, and therefore a boat, no such boat appeared in the official log—meaning that the vehicles had likely switched off their Automatic Identification Systems—something the researchers say probably happens in illegal fishing operations.

The results are in the Proceedings9 of the National Academy of Sciences. [Henri Weimerskirch et al., Ocean sentinel albatrosses locate illegal vessels10 and provide the first estimate of the extent of nondeclared fishing]

The work suggests birds could be an effective boat-monitoring tool—as long as illegal fishing operations don’t target the birds, that is. Fortunately, such a task would be difficult.

“Around fishing vessels, you can get hundreds of birds at any one time that are all flying around. So it’s not really possible to target a specific bird. And the birds with loggers on are not marked in any way. So it’s difficult for fishermen to pick out a specific bird.”

Study author Samantha Patrick, a marine11 biologist at the University of Liverpool.

Patrick’s bigger concern is that albatrosses often get hooked on fishing lines. And though regulations have been established to protect against that happening—with success—illegal boats don’t necessarily comply. So scientists might be underestimating the risk posed to albatross populations. But this system could mean that those illegal boats may have a tougher time flying under the radar.

—Christopher Intagliata 

[The above text is a transcript of this podcast.]


点击收听单词发音收听单词发音  

1 outfitting 518894948025d2d1f8b290fc0bc07872     
v.装备,配置设备,供给服装( outfit的现在分词 )
参考例句:
  • The outfitting installation activities carried out on the building berth or dock. 舾装在船台上或船钨内完成。 来自互联网
  • There is so much outfitting work. Do you subcontract some of them? 有这么多的舾装工作要做,你们将工程分包出去吗? 来自互联网
2 apparently tMmyQ     
adv.显然地;表面上,似乎
参考例句:
  • An apparently blind alley leads suddenly into an open space.山穷水尽,豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
3 transcript JgpzUp     
n.抄本,誊本,副本,肄业证书
参考例句:
  • A transcript of the tapes was presented as evidence in court.一份录音带的文字本作为证据被呈交法庭。
  • They wouldn't let me have a transcript of the interview.他们拒绝给我一份采访的文字整理稿。
4 intensity 45Ixd     
n.强烈,剧烈;强度;烈度
参考例句:
  • I didn't realize the intensity of people's feelings on this issue.我没有意识到这一问题能引起群情激奋。
  • The strike is growing in intensity.罢工日益加剧。
5 radar kTUxx     
n.雷达,无线电探测器
参考例句:
  • They are following the flight of an aircraft by radar.他们正在用雷达追踪一架飞机的飞行。
  • Enemy ships were detected on the radar.敌舰的影像已显现在雷达上。
6 emanating be70e0c91e48568de32973cab34020e6     
v.从…处传出,传出( emanate的现在分词 );产生,表现,显示
参考例句:
  • Even so, there is a slight odour of potpourri emanating from Longfellow. 纵然如此,也还是可以闻到来自朗费罗的一种轻微的杂烩的味道。 来自辞典例句
  • Many surface waters, particularly those emanating from swampy areas, are often colored to the extent. 许多地表水,特别是由沼泽地区流出的地表水常常染上一定程度的颜色。 来自辞典例句
7 gleaned 83f6cdf195a7d487666a71e02179d977     
v.一点点地收集(资料、事实)( glean的过去式和过去分词 );(收割后)拾穗
参考例句:
  • These figures have been gleaned from a number of studies. 这些数据是通过多次研究收集得来的。
  • A valuable lesson may be gleaned from it by those who have eyes to see. 明眼人可从中记取宝贵的教训。 来自《现代汉英综合大词典》
8 discrepancies 5ae435bbd140222573d5f589c82a7ff3     
n.差异,不符合(之处),不一致(之处)( discrepancy的名词复数 )
参考例句:
  • wide discrepancies in prices quoted for the work 这项工作的报价出入很大
  • When both versions of the story were collated,major discrepancies were found. 在将这个故事的两个版本对照后,找出了主要的不符之处。 来自《简明英汉词典》
9 proceedings Wk2zvX     
n.进程,过程,议程;诉讼(程序);公报
参考例句:
  • He was released on bail pending committal proceedings. 他交保获释正在候审。
  • to initiate legal proceedings against sb 对某人提起诉讼
10 vessels fc9307c2593b522954eadb3ee6c57480     
n.血管( vessel的名词复数 );船;容器;(具有特殊品质或接受特殊品质的)人
参考例句:
  • The river is navigable by vessels of up to 90 tons. 90 吨以下的船只可以从这条河通过。 来自《简明英汉词典》
  • All modern vessels of any size are fitted with radar installations. 所有现代化船只都有雷达装置。 来自《现代汉英综合大词典》
11 marine 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。
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TAG标签:   科学美国人60秒  英语听力  sss
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