Climate 'accelerating bird loss'
- added May 20, 2008
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- JanforGore
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Climate change is "significantly amplifying" the threats facing the world's bird populations, a global assessment has concluded.
The 2008 IUCN Bird Red List warns that long-term droughts and extreme weather puts additional stress on key habitats.
The assessment lists 1,226 species as threatened with extinction - one-in-eight of all bird species.
The list, reviewed every four years, is compiled by conservation charity BirdLife International.
"It is very hard to precisely attribute particular changes in specific species to climate change," said Stuart Butchart, BirdLife's global research and indicators co-ordinator.
"But there is now a whole suite of species that are clearly becoming threatened by extreme weather events and droughts."
In the revised Red List, eight species have been added to the "critically endangered" category.
CRITICALLY ENDANGERED - NEW ADDITIONS
Tristan albatross
Spoon-billed sandpiper
Tachira antpitta
Reunion cuckooshrike
Mariana crow
Floreana mockingbird
Akekee
Gough bunting
(Source: Bird Red List 2008 update)
One of these was the Floreana mockingbird (Nesomimus trifasciatus), which is confined to two islets in the Galapagos Islands.
From an estimated maximum of 150 in the mid-1960s, the population has fallen to fewer than 60.
Conservationists listed the mockingbird as Critically Endangered because it experienced a high rate of adult mortality during dry years that have been linked to La Nina events.
Dry years have become more frequent in recent years, and have been blamed as the main driver of the current decline.
"Another threat for small island species, such as the Floreana mockingbird, is the threat from invasive species, in particular mammals and plants," Dr Butchart told BBC News.
"They are having a devastating effect on habitats. For example, goats and donkeys on Floreana are changing the ecological structure.
"Eliminating or controlling invasive species is a very tractable conservation action that can help these birds hang on in the face of these additional pressures from climate change.
The 2008 IUCN Bird Red List warns that long-term droughts and extreme weather puts additional stress on key habitats.
The assessment lists 1,226 species as threatened with extinction - one-in-eight of all bird species.
The list, reviewed every four years, is compiled by conservation charity BirdLife International.
"It is very hard to precisely attribute particular changes in specific species to climate change," said Stuart Butchart, BirdLife's global research and indicators co-ordinator.
"But there is now a whole suite of species that are clearly becoming threatened by extreme weather events and droughts."
In the revised Red List, eight species have been added to the "critically endangered" category.
CRITICALLY ENDANGERED - NEW ADDITIONS
Tristan albatross
Spoon-billed sandpiper
Tachira antpitta
Reunion cuckooshrike
Mariana crow
Floreana mockingbird
Akekee
Gough bunting
(Source: Bird Red List 2008 update)
One of these was the Floreana mockingbird (Nesomimus trifasciatus), which is confined to two islets in the Galapagos Islands.
From an estimated maximum of 150 in the mid-1960s, the population has fallen to fewer than 60.
Conservationists listed the mockingbird as Critically Endangered because it experienced a high rate of adult mortality during dry years that have been linked to La Nina events.
Dry years have become more frequent in recent years, and have been blamed as the main driver of the current decline.
"Another threat for small island species, such as the Floreana mockingbird, is the threat from invasive species, in particular mammals and plants," Dr Butchart told BBC News.
"They are having a devastating effect on habitats. For example, goats and donkeys on Floreana are changing the ecological structure.
"Eliminating or controlling invasive species is a very tractable conservation action that can help these birds hang on in the face of these additional pressures from climate change.
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- JanforGore
- 3 months ago
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