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Topic: 家鴉問題 The House Crow Problem (Read 7588 times) |
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Webcreeper
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Re: 家鴉問題 The House Crow Problem
« Reply #45 on: Oct 31st, 2005, 1:25am » |
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30/10/05 明報 Mingpao
While residents worried that House Crows at Sham Shui Po might bring bird flu, AFCD said the chances of the birds getting bird flu from migrating birds were small as they live mainly in urban areas. No bird flu virus has been found in over 100 samples from House Crows. AFCD had caught 70 and euthanised birds successfully using bait meat doctored with tranquilizer.
漁護署迷魂肉餌捕烏鴉
【明報專訊】家鴉(俗稱烏鴉)問題一直困擾深水 [土步]埗居民，近日禽流感問題更令憂慮升級，漁護署表示，家鴉活動範圍集中市區，與禽流感宿主候鳥的交叉感染機會極微，化驗了逾100個家鴉樣本全不帶禽流感病毒。
署方今年試用鮮肉加鎮靜劑的藥餌「迷魂」家鴉人道毀滅，又剿滅鳥巢及鳥蛋，現 全港家鴉數目控制在300隻之內。漁護署及康文署均呼籲市民在此嚴峻時刻，勿再 餵雀。
全港烏鴉300隻 集中深水[土步]
漁護署自然保育主任利偉雄說，現時香港的家鴉集中在深水[土步]區麗閣[村]及九龍仔公園，除了噪音擾民，糞便及摷垃圾的習慣有機會傳播病菌﹔家鴉並非本港原生鳥類，會捕食其他鳥類的幼鳥及鳥蛋，破壞本港原有雀鳥生態。
漁護署2003年起懸掛雷射唱碟折射陽光，再加上播放聲帶驅趕家鴉，又放置鳥籠誘 捕，但成效不大。去年署方主動出擊，剿滅鳥蛋及幼鳥共145隻﹔今年則以鮮 豬、牛、魚、午餐肉、叉燒等加入鎮靜劑製成藥餌，家鴉中計後會無力飛行倒地， 70次 行動成功捕捉70隻家鴉，全送往人道毀滅。
利偉雄指，「要一舉殲滅家鴉並不容易，即使用槍射殺，成效短暫，長遠會令其分 布更擴散。」署方多管齊下控制家鴉，但市民必須配合，勿再餵雀。康文署亦呼籲 市民勿違反《遊樂場地規例》，在遊樂場餵飼禽鳥，保持公眾衛生。
香港現有9種鴉科鳥類，家鴉屬外來物種，源自南亞及中國西南地區，早年隨經商� 貕i入香港。90年代初全港只有十來隻家鴉，但2004年已增至250隻，曾有鳥專家估 計，若不控制其數量，10年後可增至1400隻。
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| « Last Edit: Oct 31st, 2005, 1:26am by Webcreeper » |
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LUN
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Re: 家鴉問題 The House Crow Problem
« Reply #46 on: Oct 31st, 2005, 11:23pm » |
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如果外來的烏鴉要消滅，那麼小葵花鳳頭鸚鵡要不要呢?
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Webcreeper
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Re: 家鴉問題 The House Crow Problem
« Reply #47 on: Nov 1st, 2005, 11:04pm » |
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我想問題不在於鳥是否外來，而是牠們對本地生態的影響。
小葵花鳳頭鸚鵡雖然會破壞樹木，但是牠們不會像家鴉那麼「霸道」（驅趕其他本 地雀鳥），也不會像家鴉般在垃圾堆中找食物影響衛生，「生產力」也比家鴉低（ 每次最多兩三隻），所以到目前為止對本地生態的影響似乎並不嚴重。
還有，小葵花全球只剩萬隻，是瀕危物種，保護還來不及，又怎麼能殺？
最後，小葵花鳳頭鸚鵡外形比家鴉討好（世界就是這樣不公平），就算要花錢也有 人願意買回家中飼養，所以沒有人說要將牠們趕盡殺絕。
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| « Last Edit: Nov 2nd, 2005, 8:29am by Webcreeper » |
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bfspoonbill
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Re: 家鴉問題 The House Crow Problem
« Reply #48 on: Jan 10th, 2006, 1:21pm » |
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Long time without article for this topic.
The house crows at Tsuen Wan has spread from Riviera Gardens sea shore park to Tsuen Wan Town Hall area.
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BLee
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Re: 家鴉問題 The House Crow Problem
« Reply #49 on: Jan 14th, 2006, 12:53am » |
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Is there any problem living with house crow ?
Recently, I visited Kathmandu. House crow everywhere !
I rememered the time I was in Nairobi. Also, there were many Maraburu stork over the trees. So what !
I treasured I could live harmonily with wild lives.
Why can we kill other animals so easily just because we are so-called "the master of all lives" ?
BLee
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Webcreeper
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Re: 家鴉問題 The House Crow Problem
« Reply #50 on: Jan 14th, 2006, 9:41pm » |
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Hope this can at least answer part of your question (see page one of this thread):
on Apr 30th, 2004, 3:58pm, HF_Cheung wrote:Dear all,
I like to open up discussion in HKBWS on the House Crow issue.
The arguments for controlling House Crow are:
1. They are not native species.
2. They multiply rapidly.
3. They are harmful to local wildlife.
All the above are true for House Crow.
1. If they are native species, I would suggest leave them alone.
2. If they are introduced and harmful, but they number is stable and low, I think they can be tolorated.
3. If they are not that harmful, I will also leave it alone, even though their number may increase greatly.
If we decide to control their number, we want to act as soon as possible, and find the most effective method.
Trapping have been tried, and if this is effective, I will support that. So far, killing seems to be the only viable method. Still, there are different ways to kill them.
1. Singapore government is shooting them, 45000 a year. Do we want to hear gun shot every day in urban area and in front of the public. Since Crows are very clever, once we start shooting, it will drive some of them outside the Kowloon area, such as to Mai Po. I think it will become more and more difficult to shoot them as time goes on.
2. According to Prof. Sodhi of Singapore, people have tried poisoning House Crow in Aden of Yeman. Using slow poision in labelled eggs, very large number of House Crow are killed this way. The problem seems to be that more House Crow come to Aden city next year. So it is not very successfully in Aden.
This situation in HK is different. If we succesfully poision most House Crows in HK, there is no danger of large flock coming from neighboring region. The obvious disadvantage of poisoning is that native bird may also be hurted. In Hong Kong, the potential victims are Common Magpie and Black Kite. I think the poisoning site will be at Kowloon Tsai park and/or Shum Shui Po. First one find out the Magpie and Kite population and habit in these area, and then one choose a suitable site to put out reasonable number of poisoned eggs, and adjusted the operation from time to time. I think this is the way to go.
I believe the method will not disperse the House Crow population. If we can keep them in one small place (at present mainly in Kowloon), the method will have a much better chance of success.
I am open to other suggestions.
HF Cheung
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