手机APP下载

您现在的位置: ms196明仕亚洲 > 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:荧光棒帮助生态学家研究两栖动物

来源:可可英语 编辑:aimee   VIP免费外教试听课 |  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..
8aS=E&[+WXQn[_rI#7SKPe)*+MSxm.p0This is Scientific American's 60-second Science, I'm Annie Sneed.
Populations of frogs, salamanders and other amphibians are declining around the world—even in protected areas, like U.S. national parks. Ecologists needed a simple method to track the animals' numbers. Now, researchers have found an effective way to keep tabs on amphibians—using that concert and party favorite: glow sticks. Green glow sticks, to be specific.
"What we do know is that their eyes are particularly sensitive to green light."
David Munoz, a PhD candidate in the ecology program at Penn State University.
To test the idea, Munoz and colleagues set up minnow traps with and without glow sticks at a dozen vernal pools in Centre County, Pennsylvania. The critters gather at the pools to breed.
For a month, they trapped and tracked numbers of the Jefferson salamander, the spotted salamander, the wood frog and the eastern red-spotted newt. "Right before we left for the day, around 4 P.M., we'd activate the glow stick and hang it on the little minnow trap, come back the next day to see what we got."
FRrJ[@bsbj^0O_y荧光棒.jpg
Traps with glow sticks were vastly more productive. "We were really surprised by how strong of an effect our glow sticks had on our captures. So, by just putting a glow stick in one of these minnow traps we increased the capture rates for our spotted salamanders and our Jefferson salamanders between on average two to four times." And for the eastern red-spotted newt, the glow stick traps lured six times as many.
"You know, these salamanders and these amphibians are going to these sites to breed. And so what are they looking for? They're looking for other individuals...and so what we think is that the glow stick is either making the movement of other salamanders more apparent, or it's potentially just a simple visual cue...their eyes are sensitive to this type of light, so they might be attracted to it."
Regardless of the reason, Munoz hopes his team's glowing discovery will benefit amphibians. "In order to help manage those species, and help bring them back, or reverse those declines, we need to understand what's causing those declines. And the way we do that is by monitoring populations."
Another nice thing about glow sticks: they're cheap. "It gives scientists a new tool, and essentially a better tool to help achieve that monitoring on a cost effective basis."
Thanks for listening for Scientific American — 60-Second Science. I'm Annie Sneed.
Qe86Q@8F]NiB&]vv6C7X .!|Z4REggZi@JdmJibRmr2_te5E0n;!zlVghq)]m8OcCw1Pq~O.v)1Wc_
重点单词   查看全部解释    
capture ['kæptʃə]
想一想再看
vt. 捕获,俘获,夺取,占领,迷住,(用照片等)留存<
联想记忆
essentially [i'senʃəli]
想一想再看
adv. 本质上,本来
 
minnow ['minəu]
想一想再看
n. 鲦鱼,小淡水鱼
 
reverse [ri'və:s]
想一想再看
n. 相反,背面,失败,倒档
adj. 反面的
联想记忆
corporate ['kɔ:pərit]
想一想再看
adj. 社团的,法人的,共同的,全体的
联想记忆
specific [spi'sifik]
想一想再看
adj. 特殊的,明确的,具有特效的
n. 特
联想记忆
stick [stik]
想一想再看
n. 枝,杆,手杖
vt. 插于,刺入,竖起<
 
species ['spi:ʃiz]
想一想再看
n. (单复同)物种,种类
 
concert ['kɔnsət]
想一想再看
n. 音乐会,一致,和谐
vt. 制定计划,通
 
candidate ['kændidit]
想一想再看
n. 候选人,求职者
联想记忆

发布评论我来说2句

    英语学习推荐

    科学美国人60秒

    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。