Post by cerridwen on May 20, 2008 17:14:23 GMT
Climate change raising extinction risk among birds:
study
AFP - Monday, May 19 07:26 pmBONN, Germany (AFP)
- Climate change has emerged as a major factor behind the growing risk of extinction facing birds, the world's leading conservation agency warned on Monday.
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"Long-term drought and sudden extreme weather are putting additional stress on the pockets of habitat that many threatened species depend on," the International Union for Conservation of Nature (IUCN) said in a report issued on the sidelines of a global biodiversity convention.
"This, coupled with extensive and expanding habitat destruction, has led to an increase in the rate of extinction on continents and away from islands, where most historical extinction has occurred."
The Swiss-based organisation issued an update of its "Red List," the highly respected catalogue of species at threat.
Of the 1,226 birds on the list, 190 are "critically endangered," the highest category of threat.
Eight additional species have entered this category compared to the last list. These each face an extremely high risk of extinction in the wild, and include the Tristan albatross (Diomedea dabbenena) of the South Atlantic and the Floreana mockingbird (Nesomimus trifasciatus) of the Galapagos islands.
In all, 24 species have moved into a higher level of threat as a result of shrinking population or declining habitat. Just two species have seen their prospects improved.
Those seen at greater threat include widespread continental species such as the Eurasian curlew (Numenius arquata) and Dartford warbler (Sylvia undata), both previously in the "least concern" category but now regarded as "near threatened."
"Species are being hit by the double whammy of habitat loss and climate change," said Stuart Butchart, research coordinator with BirdLife, an alliance of conservation organisations, which helped compile the list.
"As populations become fragmented the effect of climate change can have an even greater impact, leading to an increased risk of local extinctions."
The IUCN highlighted the threat to three species:
-- The Mallee emuwren (Stipiturus mallee), a native of South Australia, where the last significant population comprises just 100 birds confined to 100 square kilometres (38 square miles). "Its habitat is now so fragmented that a single bushfire could be catastrophic," the IUCN warned;
-- The New Britain Goshawk (Accipiter princes), a bird of prey in Papua New Guinea, whose habitat has been ravaged by palm-oil plantations;
-- The spoon-billed sandpiper (Eurynorhynchus pygmeus), which migrates between northeastern Russia and Southeast Asia. Its tidal-flat habitat has been badly eroded and its tundra breeding grounds are threatened by climate change.
The rare pieces of good news offered by the IUCN were attributed to two successful conservation programmes.
The first involved the Marquesan Imperial-pigeon (Ducula galeata), whose signature call is a "deep bellow waah-waah, like the mooing of a cow," according to BirdLife.
The species, which is a native of French Polynesia, is doing well under a translocation programme which has shifted breeding pairs to a new home.
The other is the little spotted kiwi (Apteryx owenii). Individuals have been moved out of New Zealand's South Island to new territories and are slowly reproducing.
"This goes to show not only that conservation action works but that it is vital if we are to prevent the extinction of these and other species," Butchart said.
Some 6,000 representatives from 191 countries are attending the 11-day conference on the UN's convention on biodiversity, which was first adopted at the Rio Earth summit in 1992.
study
AFP - Monday, May 19 07:26 pmBONN, Germany (AFP)
- Climate change has emerged as a major factor behind the growing risk of extinction facing birds, the world's leading conservation agency warned on Monday.
ADVERTISEMENT
"Long-term drought and sudden extreme weather are putting additional stress on the pockets of habitat that many threatened species depend on," the International Union for Conservation of Nature (IUCN) said in a report issued on the sidelines of a global biodiversity convention.
"This, coupled with extensive and expanding habitat destruction, has led to an increase in the rate of extinction on continents and away from islands, where most historical extinction has occurred."
The Swiss-based organisation issued an update of its "Red List," the highly respected catalogue of species at threat.
Of the 1,226 birds on the list, 190 are "critically endangered," the highest category of threat.
Eight additional species have entered this category compared to the last list. These each face an extremely high risk of extinction in the wild, and include the Tristan albatross (Diomedea dabbenena) of the South Atlantic and the Floreana mockingbird (Nesomimus trifasciatus) of the Galapagos islands.
In all, 24 species have moved into a higher level of threat as a result of shrinking population or declining habitat. Just two species have seen their prospects improved.
Those seen at greater threat include widespread continental species such as the Eurasian curlew (Numenius arquata) and Dartford warbler (Sylvia undata), both previously in the "least concern" category but now regarded as "near threatened."
"Species are being hit by the double whammy of habitat loss and climate change," said Stuart Butchart, research coordinator with BirdLife, an alliance of conservation organisations, which helped compile the list.
"As populations become fragmented the effect of climate change can have an even greater impact, leading to an increased risk of local extinctions."
The IUCN highlighted the threat to three species:
-- The Mallee emuwren (Stipiturus mallee), a native of South Australia, where the last significant population comprises just 100 birds confined to 100 square kilometres (38 square miles). "Its habitat is now so fragmented that a single bushfire could be catastrophic," the IUCN warned;
-- The New Britain Goshawk (Accipiter princes), a bird of prey in Papua New Guinea, whose habitat has been ravaged by palm-oil plantations;
-- The spoon-billed sandpiper (Eurynorhynchus pygmeus), which migrates between northeastern Russia and Southeast Asia. Its tidal-flat habitat has been badly eroded and its tundra breeding grounds are threatened by climate change.
The rare pieces of good news offered by the IUCN were attributed to two successful conservation programmes.
The first involved the Marquesan Imperial-pigeon (Ducula galeata), whose signature call is a "deep bellow waah-waah, like the mooing of a cow," according to BirdLife.
The species, which is a native of French Polynesia, is doing well under a translocation programme which has shifted breeding pairs to a new home.
The other is the little spotted kiwi (Apteryx owenii). Individuals have been moved out of New Zealand's South Island to new territories and are slowly reproducing.
"This goes to show not only that conservation action works but that it is vital if we are to prevent the extinction of these and other species," Butchart said.
Some 6,000 representatives from 191 countries are attending the 11-day conference on the UN's convention on biodiversity, which was first adopted at the Rio Earth summit in 1992.