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SSS 2010-09-20

时间:2010-10-08 05:58来源:互联网 提供网友:xn0006   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science, I’m Cynthia Graber. This’ll just take a minute.

Songbirds sing to entice1 mates, and the timing2 of those songs is often regulated by sunlight. But that timing is getting thrown off—by streetlamps. That’s according to research published in the journal Current Biology.

Scientists at the Max Planck Institute for Ornithology3 in Germany studied five common forest-breeding songbirds. Males in four species started singing significantly earlier in the morning if they lived near streetlights than did their deep forest-dwelling kin4. And for one species studied, males were more successful at attracting extra-pair mates. Those are females other than the male’s primary nest-mate with whom they sire offspring.

Sounds great, right? Well, the researchers say, not so fast. They note that the males may be weaker, because they get less sleep due to the lights. And so females who used to take early singing as a sign of virility5 may be attracted to weaker males who simply can’t sleep because the lights are on. The early singing may also put the males at greater risk of predation.

The researchers say we don’t understand the long-term effects. But they add a hopeful note—companies are developing new streetlamps with reduced light pollution, which could also help songbirds get their z’s.

Thanks for the minute, for Scientific American’s 60-Second Science, I’m Cynthia Graber.


点击收听单词发音收听单词发音  

1 entice FjazS     
v.诱骗,引诱,怂恿
参考例句:
  • Nothing will entice the children from television.没有任何东西能把孩子们从电视机前诱开。
  • I don't see why the English should want to entice us away from our native land.我不明白,为什英国人要引诱我们离开自己的国土。
2 timing rgUzGC     
n.时间安排,时间选择
参考例句:
  • The timing of the meeting is not convenient.会议的时间安排不合适。
  • The timing of our statement is very opportune.我们发表声明选择的时机很恰当。
3 ornithology HJCxh     
n.鸟类学
参考例句:
  • He found his vocation in ornithology.他发现自己适于专攻鸟类学。
  • His main interests are botany and ornithology.他主要对植物学和鸟类学感兴趣。
4 kin 22Zxv     
n.家族,亲属,血缘关系;adj.亲属关系的,同类的
参考例句:
  • He comes of good kin.他出身好。
  • She has gone to live with her husband's kin.她住到丈夫的亲戚家里去了。
5 virility JUKzS     
n.雄劲,丈夫气
参考例句:
  • He wanted his sons to become strong,virile,and athletic like himself.他希望他的儿子们能长得像他一样强壮、阳刚而又健美。
  • He is a tall,virile man with rugged good looks.他是个身材高大、体魄健壮、相貌粗犷英俊的男子。
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