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SSS 2011-02-03

时间:2011-03-04 03:43来源:互联网 提供网友:si3574   字体: [ ]
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Orchids2 are among the most successful flowering plants, with more than 22,000 species around the world. And that’s not just because of the obsession3 they inspire in their human fans.

Researchers spent 10 years studying orchids in South Africa, where the flowers are particularly diverse. The scientists say orchids became successful by changing or sharing pollinators, but staying loyal to fungi4. Here’s one example. There are two species of orchids that live very close together in South Africa. One orchid1 deposits its pollen5 on a particular bee’s front legs. The other leaves pollen only on the bee’s abdomen6. The same bee thus serves two different species and keeps the pollen separate.

But when it comes to fungi—which supply the orchid with nutrients7—the flowers are much more faithful. They might switch pollinators if transplanted, but they stick with the same fungus8 species. And one orchid species uses different fungi than a close orchid neighbor, to prevent competing for the same nutrients. The research was published in The American Naturalist9.

The scientists say the findings help explain how so many species of orchids developed, and can exist so close together. The human mania10 for orchids, however, remains11 mysterious.

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 orchid b02yP     
n.兰花,淡紫色
参考例句:
  • The orchid is a class of plant which I have never tried to grow.兰花这类植物我从来没种过。
  • There are over 35 000 species of orchid distributed throughout the world.有35,000多种兰花分布在世界各地。
2 orchids 8f804ec07c1f943ef9230929314bd063     
n.兰花( orchid的名词复数 )
参考例句:
  • Wild flowers such as orchids and primroses are becoming rare. 兰花和报春花这类野花越来越稀少了。 来自《简明英汉词典》
  • She breeds orchids in her greenhouse. 她在温室里培育兰花。 来自《简明英汉词典》
3 obsession eIdxt     
n.困扰,无法摆脱的思想(或情感)
参考例句:
  • I was suffering from obsession that my career would be ended.那时的我陷入了我的事业有可能就此终止的困扰当中。
  • She would try to forget her obsession with Christopher.她会努力忘记对克里斯托弗的迷恋。
4 fungi 6hRx6     
n.真菌,霉菌
参考例句:
  • Students practice to apply the study of genetics to multicellular plants and fungi.学生们练习把基因学应用到多细胞植物和真菌中。
  • The lawn was covered with fungi.草地上到处都是蘑菇。
5 pollen h1Uzz     
n.[植]花粉
参考例句:
  • Hummingbirds have discovered that nectar and pollen are very nutritious.蜂鸟发现花蜜和花粉是很有营养的。
  • He developed an allergy to pollen.他对花粉过敏。
6 abdomen MfXym     
n.腹,下腹(胸部到腿部的部分)
参考例句:
  • How to know to there is ascarid inside abdomen?怎样知道肚子里面有蛔虫?
  • He was anxious about an off-and-on pain the abdomen.他因时隐时现的腹痛而焦虑。
7 nutrients 6a1e1ed248a3ac49744c39cc962fb607     
n.(食品或化学品)营养物,营养品( nutrient的名词复数 )
参考例句:
  • a lack of essential nutrients 基本营养的缺乏
  • Nutrients are absorbed into the bloodstream. 营养素被吸收进血液。 来自《简明英汉词典》
8 fungus gzRyI     
n.真菌,真菌类植物
参考例句:
  • Mushrooms are a type of fungus.蘑菇是一种真菌。
  • This fungus can just be detected by the unaided eye.这种真菌只用肉眼就能检查出。
9 naturalist QFKxZ     
n.博物学家(尤指直接观察动植物者)
参考例句:
  • He was a printer by trade and naturalist by avocation.他从事印刷业,同时是个博物学爱好者。
  • The naturalist told us many stories about birds.博物学家给我们讲述了许多有关鸟儿的故事。
10 mania 9BWxu     
n.疯狂;躁狂症,狂热,癖好
参考例句:
  • Football mania is sweeping the country.足球热正风靡全国。
  • Collecting small items can easily become a mania.收藏零星物品往往容易变成一种癖好。
11 remains 1kMzTy     
n.剩余物,残留物;遗体,遗迹
参考例句:
  • He ate the remains of food hungrily.他狼吞虎咽地吃剩余的食物。
  • The remains of the meal were fed to the dog.残羹剩饭喂狗了。
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