Urban environment not so good for birds


	Urban environment not so good for birds

Fast T friend

7-8-2008 2:38 AM

236 views

tags:

song, birds, urban, risk, damage, noise, nature

Fast T friend says:

'There are many different strategies that birds deploy to counter the noise of the urban environment. These strategies could lead to us seeing a completely separate urban species of bird which can't breed with its country cousin.'

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/86f18f14-7ccd-47ff-9307-c676277c957b/A0C66DF7-9880-4AB3-9934-99C5EBD09D67/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour" href="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour" style="font-size: 11px;">www.guardian.co.uk</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour"><div align="center"><img src="http://content7.clipmarks.com/blog_cache/www.guardian.co.uk/img/30404288-1055-4EED-8F4A-E2DE1FF6F836" alt="Robin singing" /></div></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour"><P>Songbirds in cities are damaging their health, exposing themselves to predators and weakening their gene pool by trying to be heard above the din of urban life.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour"><P>New research shows that male birds trying to compete with traffic and city sounds are singing louder and at increasingly higher frequencies, which could harm their vocal cords and hearing. As a result their songs are becoming more chaotic and less diverse, which makes them less attractive to female birds and damages their mating opportunities. Some birds, including robins, are choosing to sing at night instead of during the day. This not only makes them more vulnerable to attack but, because the birds need to be awake in daylight hours to feed, creates stress and exhaustion.</P></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.guardian.co.uk/environment/2008/jun/29/wildlife.animalbehaviour">Birds sing to warn of danger, attract a mate and mark out their territory. Another study of the dawn chorus of nightingales found that birds in Berlin sang up to 14 decibels louder than their counterparts in the forest.</blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/A0C66DF7-9880-4AB3-9934-99C5EBD09D67/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>