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:猛玛象化石雄性居多

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..
l4C(a7f_vmLrF&xo

=UctuWrQpUI.nX-)L&

This is Scientific American — 60-Second Science. I'm Christopher Intagliata.
Woolly mammoths once ruled the northern reaches of our planet—roaming from Portugal to Siberia, and beyond to Alaska, Canada and the American Midwest. And the massive beasts left lots of fossil evidence of their occupation.
But now scientists have noticed a strange trend among those mammoth remains. The researchers genetically analyzed the fossilized bones, teeth and tusks of 98 individual Siberian mammoths. And they found that 70 percent of the mammoths...were males.
"So essentially we think this is driven by two different things." Love Dalén, a paleogeneticist and professor at the Swedish Museum of Natural History in Stockholm. "In general, in wild animals, males tend to be more risk-taking."

T4I+~|H]EuZ_e.%

猛玛象.jpg
The second thing, if modern elephant culture is any indication, is that male mammoths may have been solitary loners. More likely to crash through thin ice and sinkholes, or get caught in a mudslide than females. These types of death are more likely to become preserved—so those are the remains that we find today. The study is in the journal Current Biology.
Dalén says this is an important reminder that the fossil record is far from complete. "The fossils we find might not always be representative of the species back when it lived." But with a little detective work, even seemingly random remains have much to reveal.
Thanks for listening for Scientific American — 60-Second Science Science. I'm Christopher Intagliata.

[g8p2cI%KKH-*0

O%fO=MRiEKT[Wr8K

T%#uKbX6x]K.qx6oElG(KFr=uc19J_r3lr0A-1.

重点单词   查看全部解释    
evidence ['evidəns]

想一想再看

n. 根据,证据
v. 证实,证明

联想记忆
solitary ['sɔlitəri]

想一想再看

adj. 孤独的,独立的,单个的,唯一的,荒凉的

联想记忆
trend [trend]

想一想再看

n. 趋势,倾向,方位
vi. 倾向,转向

联想记忆
essentially [i'senʃəli]

想一想再看

adv. 本质上,本来

 
random ['rændəm]

想一想再看

adj. 随机的,随意的,任意的
adv. 随

 
species ['spi:ʃiz]

想一想再看

n. (单复同)物种,种类

 
occupation [.ɔkju'peiʃən]

想一想再看

n. 职业,侵占,居住

 
detective [di'tektiv]

想一想再看

adj. 侦探的
n. 侦探

联想记忆
obvious ['ɔbviəs]

想一想再看

adj. 明显的,显然的

联想记忆
indication [.indi'keiʃən]

想一想再看

n. 表示,指示,象征

 

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。