Climate change is taking a toll on U.S. bird populations

North American bird species are "facing a new threat—climate change—that could dramatically alter their habitat and food supply, and push many species towards extinction," said Secretary of the Interior Ken Salazar on Thursday when he announced the new report, "The State of the Birds: 2010 Report on Climate Change."

According to the report, climate changes will have "an increasingly disruptive effect on bird species in all habitats." Oceanic migratory species and birds living in Hawaii will face the greatest threats, according to the report.Among the report's key findings:

• All 67 species of oceanic birds commonly found in the U.S. (including albatrosses, petrels, tropical terns, tropic birds, frigate birds and puffins) are vulnerable to disruptions in their habitats due to climate change. The birds all have low reproductive rates and rely on locations which are likely to face heavy changes, along with the climate. Overfishing and invasive species also threaten these oceanic birds.
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• Coastal birds (such as the saltmarsh sparrow) will be threatened by rising sea levels and increased storm activity, which will damage or destroy the fragile ecosystems on which they rely.
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• Island birds will also be threatened by rising sea levels and shrinking habitats. Hawaii's puaiohi and 'akiapola'au, along with the Puerto Rican parrot are among the species that will feel the pinch in these circumstances.
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• Arctic and alpine species like the white-tailed ptarmigan and gray crowned rosy-finch will lose critical breeding and feeding habitat as increased temperatures alter the patterns of surface water and vegetation.
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• Birds in wetlands will suffer from increased droughts, those in grasslands will experience drier habitats, and forest dwellers will find their habitats shifting northward and to higher elevations, which could separate them from their current food resources.