Changes in the global climate are imposing additional stress on hundreds of species of migratory birds in the United States that are already threatened by other environmental factors, according to a new Interior Department report. The latest version of the department’s annual State of the Birds report shows that nearly a third of the nation’s 800 bird species are endangered, threatened or suffering from population decline. For the first time, the report adds climate change to other factors threatening bird populations, including destruction of habitat, hunting, pesticides, invasive species and loss of wetlands. The report said that oceanic and shore birds are among the most vulnerable to climate change because of rapidly changing marine ecosystems and rising sea levels. The conclusions are the result of a collaboration of federal and state wildlife agencies, universities and conservation groups.

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