手机APP下载

您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人科学系列 > 正文

科学美国人60秒:鱼类声音揭示亚马逊河的水下争斗

来源:可可英语 编辑:aimee   可可英语APP下载 |  可可官方微信:ikekenet
 下载MP3到电脑  批量下载MP3和LRC到手机
加载中..
y5xNXq!=P4

JF@1a1wzCdulFtHMOUoX

This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
Six years ago, the fish ecologist Rodney Rountree was on a skiff in the Peruvian Amazon. He was holding a piranha in his hand...underwater...in a river filled with other piranhas. Maybe, hungry ones. "That thought crossed my mind a little bit. The water was essentially no visibility. So I did worry a little bit about that but there was no other way to do it."
The job he needed to do? "Audition them, for sound production." Because Rountree studies the sounds fish make. His nickname—and the name of his company: "The Fish Listener." So his team would catch a fish, reel it in and identify it. And then Rountree would hold it underwater, near a hydrophone, to capture the sounds it made. Like this one, from a red piranha. (CLIP: piranha sound)
"A lot of people call it a bark. I sometimes thought of it as a honk." The fish make the sound, he says, by pushing and pulling on their swim bladder with the surrounding muscles. Overall, Rountree auditioned 129 piranhas, of four different species. Along with dozens of other river species, like catfish. And he found that he could differentiate individual piranha species by analyzing factors like pitch and harmonics and number of barks.

eKF_WI,S)7Mw0z,I#aJB

鱼类声音.jpg
His colleague Francis Juanes presented the work at the Acoustical Society of America meeting in Victoria, Canada.
Rountree also recorded 10 hours of underwater soundscapes, like this one, captured during a piranha feeding frenzy. (CLIP: noisy river) There's a piranha honk, he says, and lots of catfish screeching. Which suggests that, with a bit more study, underwater recordings like these might give us a clearer glimpse of who's doing what, in murky waters.
Thanks for listening for Scientific American — 60-Second Science. I'm Christopher Intagliata.

~8J6HvU]pdjM*

u^g&5l[qFJV#jb+g

Apn]a&bFD9Q|o@pQZvt=JwbY99GE7NdVX(%-)#kt%mrrP-*42TJ

重点单词   查看全部解释    
murky ['mə:ki]

想一想再看

adj. 黑暗的,朦胧的,烟雾弥漫的,含糊的,隐晦的

联想记忆
visibility [.vizi'biliti]

想一想再看

n. 能见度

 
bark [bɑ:k]

想一想再看

v. (狗)吠,咆哮
n. 狗吠,咆哮

 
clip [klip]

想一想再看

n. 夹子,钳,回形针,弹夹
n. 修剪,(羊

 
identify [ai'dentifai]

想一想再看

vt. 识别,认明,鉴定
vi. 认同,感同身

 
frenzy ['frenzi]

想一想再看

n. 狂暴,狂怒

 
overall [əuvə'rɔ:l]

想一想再看

adj. 全部的,全体的,一切在内的
adv.

 
skiff [skif]

想一想再看

n. 轻舟,小船

联想记忆
ecologist [i:'kɔlədʒist]

想一想再看

n. 生态学家

 
differentiate [.difə'renʃi.eit]

想一想再看

vt. 识别,使差异,求导数,区分,区别对待

联想记忆

发布评论我来说2句

    最新文章

    可可英语官方微信(微信号:ikekenet)

    每天向大家推送短小精悍的英语学习资料.

    添加方式1.扫描上方可可官方微信二维码。
    添加方式2.搜索微信号ikekenet添加即可。