市郊生活的鸟类比农村鸟类更易“愤怒”-凯发k8官网

市郊生活的鸟类比农村鸟类更易“愤怒”
文章来源:未知 文章作者:enread 发布时间:2016-07-16 07:37 字体: [ ] 
(单词翻译:双击或拖选)
no need to head to the movie theater or download the video game app: angry birds can be found right in your backyard this summer--if you live in the suburbs, that is. virginia tech researchers recently found that birds that live in 1 areas exhibit significantly higher levels of 2 3 than their country counterparts. the results were recently published in biology letters.
 
"a possible reason for this is that these birds have less space but better resources to defend," said scott davies, a postdoctoral associate in biological sciences in the college of science. "living near humans provides better food and shelter, but it also means more competition for these limited resources."
 
davies and co-author kendra sewall, an assistant professor of biological sciences in the college of science, measured territorial aggression in 35 urban and 38 rural male song sparrows at three rural and three urban sites in the new river valley during the spring of 2015. 
 
the virginia tech and radford university campuses served as the (sub)urban sites due to their levels of human impact. rural sites included kentland farm and heritage park. in these settings, the researchers played a 4 of a male song sparrow and observed how the territory-holding birds responded to a simulated intrusion from a neighbor.
 
campus birds showed a higher level of aggression: they approached and remained near the speaker, flapped their wings furiously, engaged in loud singing and then began to produce 'soft song'--a term that researchers use to describe the quiet, 5 noise that a bird makes, which is predictive of an 6 attack.
 
though rural birds still responded to a song intrusion, they did not respond as vigorously.
 
the researchers placed small leg bands on the birds to identify individuals, and recorded each individual's responses twice, several weeks apart. the suburban birds were more territorial on both occasions, showing that their increased aggression persists throughout a breeding season.


点击收听单词发音收听单词发音  

1 usywk     
adj.城郊的,在郊区的
参考例句:
  • suburban shopping centers were springing up all over america. 效区的商业中心在美国如雨后春笋般地兴起。
  • there's a lot of good things about suburban living.郊区生活是有许多优点。
2 limz4     
adj.领土的,领地的
参考例句:
  • the country is fighting to preserve its territorial integrity.该国在为保持领土的完整而进行斗争。
  • they were not allowed to fish in our territorial waters.不允许他们在我国领海捕鱼。
3 wkjyf     
n.进攻,侵略,侵犯,侵害
参考例句:
  • so long as we are firmly united, we need fear no aggression.只要我们紧密地团结,就不必惧怕外来侵略。
  • her view is that aggression is part of human nature.她认为攻击性是人类本性的一部份。
4 uktzjj     
n.录音,记录
参考例句:
  • how long will the recording of the song take?录下这首歌得花多少时间?
  • i want to play you a recording of the rehearsal.我想给你放一下彩排的录像。
5 ssvzfv     
adj.(指信息)混乱的,引起误解的v.对(事实)歪曲,对(文章等)断章取义,窜改( garble的过去式和过去分词 )
参考例句:
  • he gave a garbled account of what had happened. 他对所发生事情的叙述含混不清。
  • the coastguard needs to decipher garbled messages in a few minutes. 海岸警卫队需要在几分钟内解读这些含混不清的信息。 来自辞典例句
6 3qhzdb     
a.imminent, about to come or happen
参考例句:
  • against a background of impending famine, heavy fighting took place. 即将发生饥荒之时,严重的战乱爆发了。
  • the king convoke parliament to cope with the impending danger. 国王召开国会以应付迫近眉睫的危险。
tag标签: rural birds urban
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