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#24938 - 12/14/04 02:53 PM 1 in 10 bird species could vanish  
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Jerry Offline
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1 in 10 bird species could vanish within 100 years USA TODAY

By 2100, about 10% of all bird species probably will be extinct, killed off by habitat loss, hunting and climate change, conservation biologists estimate.
"We are changing the world so much that even birds cannot adapt," says biologist Cagan Sekercioglu of Stanford University, who led the extinction analysis.

Roughly 1,200 bird species, about 12% of the total, are threatened with extinction. A "critically endangered" 179 of those species face an extremely high risk of immediate disappearance. Last month, for example, the last known Hawaiian po'ouli bird died.

The first-time analysis looks further into the future than recent estimates of bird extinctions, adding to concerns about lost biodiversity among species.

Released Monday by the Proceedings of the National Academy of Sciences journal, the report extrapolates extinction trends among birds since 1994. Sekercioglu and colleagues analyzed the 9,916 registered bird species, looking ahead a century at extinction prospects under three scenarios:

•Status quo. Assuming that "threatened" bird species become threatened and extinct at present rates, 1 in 10 species will disappear.

•Best-case. Assuming no more species will move to the "threatened" category, about 1 in 17 species will die off.

•Worst-case. Assuming "threatened" rates increase by 1% each decade, nearly 1 in 6 bird species will become extinct.

Various factors drive the extinctions seen in the study, including:

• Fragmentation and destruction of bird habitat.

• Hunting and collecting of rare birds for the pet trade.

• Introduction of foreign species, typically cats, rats or mongooses that prey on isolated species

• Climate changes that alter the habitat of a species' home range.

"Our study shows there are things we can do" to reduce extinctions, Sekercioglu says, from expanding habitat by connecting parks to promoting ecotourism, so local people preserve, rather than hunt, rare birds.

#24939 - 12/15/04 01:47 AM Re: 1 in 10 bird species could vanish  
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jules Offline
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Do you have a link to the source for this, Jerry?
Inquiring minds & all...
TIA
Jules

#24940 - 12/15/04 03:26 AM Re: 1 in 10 bird species could vanish  
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ProjectPerry Offline
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This is what breeders will argue about when they defend their breeding practices for the pet trade.

They say - hey since the birds are going to go extinct, we (breeders) are the only hope for the survival of the species.

BS! A bird languishing in a cage is not preservation of the species.

Ecotourism is the key to preservation of the species where they belong in this world.

#24941 - 12/15/04 04:43 AM Re: 1 in 10 bird species could vanish  
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The same preservation can be accomplished through freezing DNA samples. With much less suffering.

#24942 - 12/15/04 03:34 PM Re: 1 in 10 bird species could vanish  
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GeriDoc Offline
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I have tried to find this article in PNAS, and can find no trace of it in the Dec. 14, or 3 earlier issues. Does anyone have the exact reference?

Jay

#24943 - 12/17/04 04:13 PM Re: 1 in 10 bird species could vanish  
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GeriDoc Offline
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The original paper is now online he re . It is an interesting paper because, in addition to discussing the coming avian extinction, it discusses the important services that birds provide to the ecosystem (seed spreading, carrion consumption, etc). Interesting, and understandable reading.

Jay

#24944 - 12/19/04 01:25 PM Re: 1 in 10 bird species could vanish  
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BE2Cassie Offline
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Some birds around the world are already at crisis points and beyond. The American Zoo and Aquarium Association has been working on a number of bird species. Zoos are breeding critically endangered birds for reintroduction programs. The Zoo New England Franklin Park Zoo in Boston "for the last eight years, Zoo New England has sent red-crowned crane eggs to Russia's Khinganski Nature Reserve, where they are hatched and introduced into the wild." The amount of behind the scenes work they do is incredible. These are breeding plans at their best.For additional information on the work the AZA is doing you can visit their website www.aza.org.


Nancy & Cassie BE2

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