手机APP下载

您现在的位置: 首页 > 在线广播 > 科学美国人 > 科学美国人地球系列 > 正文

科学美国人60秒:气候变化可能会使鱼类变小

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..
E~Ji,tfLX]D8US@XqUq

(,6*@KUJ)3a

This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
As the world's oceans heat up, salmon are migrating earlier. Plankton are shifting their range. But warmer water temperatures also mean warmer fish—and faster-running metabolisms.
"Fish that are in water of higher temperature have a higher metabolic rate, meaning they have to consume more oxygen." Daniel Pauly, a fisheries scientist at the University of British Columbia. "Because essentially the whole metabolism, all the chemical reactions in your body, are accelerated."
So, how about growing bigger gills to allow for more oxygen intake? Pauly did the physiological math, and concluded that bigger gills just won't do the job. Because he says gills, being relatively two-dimensional, simply can't keep up with the three-dimensional growth of the rest of a fish's body.

RBKE=lJVC3~]F8hpZFO


Instead, Pauly's calculations suggest that, to feed their increasing need for oxygen, fish of all kinds may actually shrink as a result of climate change. With decreased supply, they'll need to lower demand. The study is in the journal Global Change Biology.
One more detail bears mentioning: that is the warmer water also holds less dissolved oxygen. "So the two effects, increased demand and the lowered supply are working towards making the fish smaller."
Which means future fishermen might find a lot of lower-value small fry in their nets.
Thanks for listening for Scientific American — 60-Second Science Science. I'm Christopher Intagliata.

eqI|Z**r;#u,f)moA)

e,(#A3q((a;ClF8oE~

&HoJhfio+*mg*)IZREANCJzd3lP0aG4-.3EjBj*4k

重点单词   查看全部解释    
supply [sə'plai]

想一想再看

n. 补给,供给,供应,贮备
vt. 补给,供

联想记忆
consume [kən'sju:m]

想一想再看

v. 消耗,花费,挥霍

联想记忆
essentially [i'senʃəli]

想一想再看

adv. 本质上,本来

 
salmon ['sæmən]

想一想再看

n. 鲑,大马哈鱼,橙红色的

联想记忆
shifting [ʃiftiŋ]

想一想再看

n. 转移 adj. 不断改换的 动词shift的现在分

 
conflict ['kɔnflikt]

想一想再看

n. 冲突,矛盾,斗争,战斗
vi. 冲突,争

联想记忆
temperature ['tempritʃə(r)]

想一想再看

n. 温度,气温,体温,发烧

 
global ['gləubəl]

想一想再看

adj. 全球性的,全世界的,球状的,全局的

联想记忆
metabolic [.metə'bɔlik]

想一想再看

adj. 新陈代谢的

 
range [reindʒ]

想一想再看

n. 范围,行列,射程,山脉,一系列
v. 排

 

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。