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SSS 2011-06-15

时间:2011-07-06 01:44来源:互联网 提供网友:gmeng   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 will just take a minute.

Climate change affects seasonal1 events—spring flowers open earlier, songbirds breed sooner. But what about mammals? A new study documents the effect on a special breed of cows in the U.K.

Northumberland’s Chillingham cattle were once domesticated2, but now roam free. And they offer a unique opportunity for study, because owners started keeping detailed3 records on them in 1860, due in part to the urging of none other than Charles Darwin. The cattle are thus an excellent source of long-term info on how earlier springs affect what’s called phenology—seasonal lifecycle events.

The Chillinghams can give birth all year, not just spring and summer like most U.K. mammals. And the data show that over the past few decades, there’s been an increase in winter births, which the researchers correlated to warmer springs the previous year: plants grow earlier, the cattle have more access to nutrition and they conceive earlier.

But winter babies are more likely to die before they turn one. The research was published in the Journal of Animal Ecology.

The researchers say that even mammals that breed year round—which should offer protection against seasonal shifts—may still feel the impact of climate change.

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 seasonal LZ1xE     
adj.季节的,季节性的
参考例句:
  • The town relies on the seasonal tourist industry for jobs.这个城镇依靠季节性旅游业提供就业机会。
  • The hors d'oeuvre is seasonal vegetables.餐前小吃是应时蔬菜。
2 domesticated Lu2zBm     
adj.喜欢家庭生活的;(指动物)被驯养了的v.驯化( domesticate的过去式和过去分词 )
参考例句:
  • He is thoroughly domesticated and cooks a delicious chicken casserole. 他精于家务,烹制的砂锅炖小鸡非常可口。 来自《简明英汉词典》
  • The donkey is a domesticated form of the African wild ass. 驴是非洲野驴的一种已驯化的品种。 来自《简明英汉词典》
3 detailed xuNzms     
adj.详细的,详尽的,极注意细节的,完全的
参考例句:
  • He had made a detailed study of the terrain.他对地形作了缜密的研究。
  • A detailed list of our publications is available on request.我们的出版物有一份详细的目录备索。
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