閱讀難度：

When bombarded by noise pollution, some male birds begin to sing higher tunes, a new study has found, the Discovery News reported. And that tonal shift makes them less attractive to females.

The findings suggest that birds must make difficult trade-offs in urban areas and places where traffic and industrial noises threaten to drown them out. Either they sing less appealing songs or tones in an effort to rise above the din, or they sing the songs that make them sound appealing at the risk of not being heard at all.

Wouter Halfwerk, a behavioral ecologist at Leiden University in the Netherlands said, "It could very well be that noise pollution is interfering with reproductive decisions by females." （點(diǎn)擊Discovery網(wǎng)站查看原文）

世間太吵鳥類被迫大嗓門

???????據(jù)美國(guó)《探索新聞》報(bào)道，一項(xiàng)新的研究發(fā)現(xiàn)，噪音的狂轟濫炸使得雄性鳥兒開始高聲唱歌。這種聲調(diào)的變化降低了它們對(duì)雌性鳥兒的吸引力。

???????鳥兒們?cè)诔鞘幸约敖煌ê凸I(yè)噪音污染嚴(yán)重的地方必須作出一個(gè)艱難的選擇，因?yàn)樵胍粢呀?jīng)要把鳥兒的歌聲淹沒，它們要么唱得聲調(diào)缺少吸引力以壓過噪音，要么就唱一些有吸引力的歌而雌性鳥兒卻根本聽不到。

???????荷蘭萊頓大學(xué)的一位行為生態(tài)學(xué)家沃爾特·哈佛沃克說：“很明顯，噪音污染已經(jīng)干擾到了雌性擇偶繁殖的選擇?！?/p>

(China.org.cn September 6, 2011)