North America has lost nearly 3 billion birds since 1970, and the continent has also seen widespread population declines among hundreds of bird species.
The sharp decline, described in a
“Previously we didn’t have good estimates of population size,” Rosenberg said. “We knew the trends, but we didn’t really know how many birds of each kind were out there.” “I was pretty surprised,” said Beissinger, who was not involved in the study. “We don’t usually think in billions of birds.” Declines in the abundance of common species may not seem as dramatic as the endangerment of rare ones, but it is a very serious form of ecosystem erosion, the scientists said.
More than 1 billion birds have been lost from all forest biomes. Shorebirds, long threatened by the draining of coastal wetlands and urbanization, saw declines of more than 37%.The researchers did not weigh in on the causes for these declines. But other work has pointed to habitat loss due to urbanization, pollution, pesticides, and the intensification and expansion of agriculture as likely culprits, Rosenberg said.
Such policies and protections need to be put in place for other birds in other habitats, the scientists said.
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