因噪音污染严重 鸟儿求偶需加大分贝
<p><span word="Change">Change</span> <span word="of">of</span> <span word="tune">tune</span>: <span word="Research">Research</span> <span word="has">has</span> <span word="revealed">revealed</span> <span word="male">male</span> <span word="great">great</span> <span word="tits">tits</span> <span word="are">are</span> <span word="having">having</span> <span word="to">to</span> <span word="sing">sing</span> <span word="at">at</span> <span word="higher">higher</span> <span word="frequencies">frequencies</span> <span word="to">to</span> <span word="make">make</span> <span word="themselves">themselves</span> <span word="heard">heard</span>, <span word="but">but</span> <span word="unfortunately">unfortunately</span> <span word="for">for</span> <span word="them">them</span> <span word="this">this</span> <span word="makes">makes</span> <span word="them">them</span> <span word="less">less</span> <span word="attractive">attractive</span> <span word="to">to</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="sex">sex</span> <span word="It">It</span>'<span word="s">s</span> <span word="not">not</span> <span word="just">just</span> <span word="humans">humans</span> <span word="that">that</span> <span word="struggle">struggle</span> <span word="to">to</span> <span word="make">make</span> <span word="themselves">themselves</span> <span word="heard">heard</span> <span word="with">with</span> <span word="the">the</span> <span word="opposite">opposite</span> <span word="sex">sex</span> <span word="in">in</span> <span word="a">a</span> <span word="city">city</span>. <span word="Research">Research</span> <span word="has">has</span> <span word="revealed">revealed</span> <span word="male">male</span> <span word="birds">birds</span> <span word="are">are</span> <span word="also">also</span> <span word="having">having</span> <span word="to">to</span> <span word="change">change</span> <span word="their">their</span> <span word="tune">tune</span> <span word="in">in</span> <span word="a">a</span> <span word="bid">bid</span> <span word="to">to</span> <span word="find">find</span> <span word="a">a</span> <span word="mate">mate</span>. <span word="Scientists">Scientists</span> <span word="have">have</span> <span word="found">found</span> <span word="that">that</span> <span word="male">male</span> <span word="great">great</span> <span word="tits">tits</span> <span word="are">are</span> <span word="being">being</span> <span word="forced">forced</span> <span word="to">to</span> <span word="sing">sing</span> <span word="at">at</span> <span word="higher">higher</span> <span word="frequencies">frequencies</span> <span word="to">to</span> <span word="drown">drown</span> <span word="out">out</span> <span word="the">the</span> <span word="constant">constant</span> <span word="urban">urban</span> <span word="din">din</span> <span word="of">of</span> <span word="modern">modern</span> <span word="life">life</span>.</p><p>电视上五花八门的相亲节目在刺激着城市中诸多剩男剩女的神经末梢，也许我们并没有意识到除了我们自己，和我们一同生活在一个领域的动物也需要“相亲”。随着城市化的道路愈发明显，城市独有的污染也伴随而来，比如光污染、水污染以及声污染等等，这些城市弊病不仅危害着我们的健康，就连和我们一同生活在一个领域的动物，比如鸟儿也受到不良影响。据悉，研究者发现，生活在城市中的雄性鸟类在对雌性鸟类发出“求偶信号”时，必须发出声频“更高、更尖”的叫声、或者改变声调为了让自己爱的雌性鸟儿听到。有意思的是，这一现象与如今城市中的“剩男”增多现象有异曲同工之妙。</p><p><span word="But">But</span> <span word="this">this</span> <span word="is">is</span> <span word="seen">seen</span> <span word="by">by</span> <span word="the">the</span> <span word="females">females</span> <span word="as">as</span> <span word="less">less</span> <span word="attractive">attractive</span>, <span word="and">and</span> <span word="so">so</span> <span word="those">those</span> <span word="that">that</span> <span word="sing">sing</span> <span word="at">at</span> <span word="this">this</span> <span word="pitch">pitch</span> <span word="as">as</span> <span word="well">well</span> <span word="as">as</span> <span word="those">those</span> <span word="that">that</span> <span word="cannot">cannot</span> <span word="make">make</span> <span word="their">their</span> <span word="low">low</span>-<span word="frequency">frequency</span> <span word="songs">songs</span> <span word="heard">heard</span> <span word="are">are</span> <span word="at">at</span> <span word="risk">risk</span> <span word="of">of</span> <span word="not">not</span> <span word="finding">finding</span> <span word="a">a</span> <span word="special">special</span> <span word="feathered">feathered</span> '<span word="friend">friend</span>'. <span word="Wouter">Wouter</span> <span word="Halfwerk">Halfwerk</span>, <span word="of">of</span> <span word="Leiden">Leiden</span> <span word="University">University</span> <span word="in">in</span> <span word="the">the</span> <span word="Netherlands">Netherlands</span>, <span word="carried">carried</span> <span word="out">out</span> <span word="the">the</span> <span word="research">research</span>. <span word="His">His</span> <span word="team">team</span> <span word="recorded">recorded</span> <span word="the">the</span> <span word="communication">communication</span> <span word="between">between</span> <span word="male">male</span> <span word="and">and</span> <span word="female">female</span> <span word="great">great</span> <span word="tits">tits</span> <span word="in">in</span> <span word="a">a</span> <span word="Dutch">Dutch</span> <span word="national">national</span> <span word="park">park</span> <span word="between">between</span> <span word="April">April</span> <span word="and">and</span> <span word="May">May</span> 2009 <span word="and">and</span> 2010. <span word="They">They</span> <span word="analysed">analysed</span> <span word="the">the</span> <span word="paternity">paternity</span> <span word="of">of</span> <span word="chicks">chicks</span> <span word="and">and</span> <span word="played">played</span> <span word="the">the</span> <span word="female">female</span> <span word="birds">birds</span> <span word="recordings">recordings</span> <span word="of">of</span> <span word="male">male</span> <span word="songs">songs</span> <span word="with">with</span> <span word="different">different</span> <span word="levels">levels</span> <span word="of">of</span> <span word="background">background</span> <span word="noise">noise</span>.</p>
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