HKBWS BBS ­» ´ä Æ[ ³¾ ·| ·s »D ²Õ
        (http://www.hkbws.org.hk/cgi-bin/YaBB.pl)
      

        Discussion Area °Q½×°Ï >> Conservation ¦ÛµM«O¨| >>  ¤½²³Á¿®y¡G¥~¨Ó®a¾~¡]¯Q¾~¡^¦a°ìªºÂX±i (24/4/2004)
        
(Message started by: Project Officer on Apr 1st, 2004, 9:59pm)
Title: ¤½²³Á¿®y¡G¥~¨Ó®a¾~¡]¯Q¾~¡^¦a°ìªºÂX±i (24/4/2004)
Post by Project Officer on Apr 1st, 2004, 9:59pm
¤½²³Á¿®y¡G¥~¨Ó®a¾~¡]¯Q¾~¡^¦a°ìªºÂX±i
¡Ð ­»´ä¡B«n¨È¤Î¥þ²y©Ê°ÝÃD

¤é´Á¤Î®É¶¡¡G2004¦~4¤ë24¤é¬P´Á¤»¡A¤U¤È2®É30¤À ¦Ü 4®É30¤À

¦aÂI¡G¤EÀs­»´ä«°¥«¤j¾Ç ¥|¼Ó ºtÁ¿ÆULT-10

©Ó¿ì¡GÄR»Õ邨©~¥Á¨ó·| / ¤j®HÀô«O¨ó¶i·|

ÃÙ§U¡G²`¤ô埗°Ïij·| / ¤j®HÀô«O¨ó¶i·|

Á¿ªÌ¡G
- ¸â»F®õ ³Õ¤h¡]¦ÛµM«O¨|ÅU°Ý¡^
- ¶¾ÀË°ò ¥ßªk·|ij­û ¡]­»´ä¥Á¥D¥Á¥Í¨ó¶i·|¥D®u¡^
- Navjot S. SODHI ±Ð±Â¡]·s¥[©Y°ê¥ß¤j¾Ç¥Íª«¬ì¾Ç¨t°Æ±Ð±Â¡F¨È¬wª¾¦W®a¾~¾ÇªÌ¡^

ÃD¥Ø¡G
(¤@¡^®a¾~ªº¦æ¬°©M¥þ²y©ÊÂX±i¡]¥Ñ¸â»F®õ³Õ¤h¥H¸f»y¥DÁ¿¨Ã°t¥H­^¤åPowerPoint¡^
(¤G¡^®a¾~¦b­»´ä¤×¨ä¬O²`¤ô埗°Ï³y¦¨ªº´þÂZ¡]¥Ñ¶¾ÀË°òij­û¥H¸f»y¥DÁ¿¡^
¡]¤T¡^®a¾~¦b·s¥[©Yªº¥ÍºA©M±±¨î¤èªk¡]¥ÑSODHI±Ð±Â¥H­^»y¥DÁ¿¡^

ÃD¥Ø¤T¤§¼¼­n
The house crow (Corvus splendens) has successfully invaded regions well beyond its native range, reaching pest proportions in many areas. Past efforts to control it have met with repeated failures due to a lack of detailed ecological understanding to guide management. The invasive population of house crows in Singapore has increased at least 30-fold since 1985, and now number more than 130,000 birds. Crows are considered a pest in Singapore due to attacks on humans, accumulation of feces under communal roosts, their potential role as vectors for human pathogens, and possible negative impacts on native bird species. To understand the biology of the house crow in Singapore, we collected data on aspects such as the population characteristics, roosting behaviour and nesting ecology. Our study shows that the house crows have adapted well in Singapore where ample resources such as food and suitable nesting and roosting sites are available. Using a discrete-time density dependent population model, we demonstrate that at least 41,000 crows will need to be culled in the first year of a control program, and an equivalent effort maintained each year thereafter within a 10 year period. This figure drops to 32,000 if culling is combined with other management strategies such as resource limitation and nest destruction. A large-scale effort to cull crows in Singapore has started since 2002, however a complete eradication of this species may be unrealistic due to difficulties in detecting crows at low densities and influx of migrants from neighbouring Malaysia.

~ Åw ªï ¥X ®u ~
¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð¡Ð
¡m µn °O ¡n
½Ð¶ñ§´¥H¤Uªí®æ¨Ã¶Ç¯u¦Ü¤j®HÀô«O¨ó¶i·|¡]¶Ç¯u¡G2690 3438¡^©Î §â¦³Ãö¸ê®Æ¹q¶l¦Ütaipoea@sinatown.com¡Cµn°O/¤J³õ¶O´ä¹ú20¤¸¥¿¡]*¥þ¤é¨î¾Ç¥Í§K¶O¡A¬ã¨s¥Í°£¥~¡^¡C¦WÃB100¦ì¡A½Ð±q³tµn°O¡C¦p¦³¬d¸ß¡AÅwªï­P¹q2739 2481¤j®HÀô«O¨ó¶i·|³¯¤p©j¡C°Ñ¥[ªÌ±N·|©ó4¤ë21¤é«e¦¬¨ì¹q¶l½T©w¦¨¥\µn°O¡C

¥»¤H§Æ±æ°Ñ¥[2004¦~4¤ë24¤éÁ|¦æ¤§¤½²³Á¿®y¡A¨Ã©ú¥Õ¦b¦¨¥\µn°O«á¤£½×¥X®u»P§_¦³¸q°Èú¥I´ä¹ú20¤¸¥¿µ¹¤j®HÀô«O¨ó¶i·|§@¬°µn°O/¤J³õ¶O¡C

©m¦W¡]­^¤å¡^¡G
Ápµ¸¹q¸Ü¡G
¹q¶l¡G
²Õ´ / ¾÷ºc¡]­^¤å¡^¡G
¥þ¤é¨î¾Ç¥Í*¡G¬O / §_
Ápµ¸¦a§}¡]­^¤å¡^:


HKBWS BBS ­» ´ä Æ[ ³¾ ·| ·s »D ²Õ » Powered by YaBB!
YaBB 2000-2002, Xnull. All Rights Reserved.