The habitats of wild bird species are shifting in response to global warming, but not fast enough to keep pace with rising temperatures, a study released yesterday showed.
Researchers in France also found that the delicate balance of wildlife in different ecosystems is changing up to eight times more quickly than previously suspected, with potentially severe consequences for some species.
“The flora and fauna around us are shifting over time due to climate change,” said lead author Victor Devictor, a researcher at the French National Museum of Natural History.
“The result is desynchronization. If birds and the insects upon which they depend do not react in the same way, we are headed for an upheaval in the interaction between species,” he said in a telephone interview.
These “mismatches” are likely to become greater over time and could eventually threaten some birds with extinction, he said.
The study showed that the geographic range of 105 birds species in France — accounting for 99.5 percent of its wild avian population — moved north, on average, 91km from 1989 through 2006.
Average temperatures, however, shifted northward 273km over the same period, nearly three times farther. The fact that some birds have responded to climate change had already been noted in individual species.
What surprised Devictor and his colleagues was that the shift held true for virtually all birds in France, and that the gap with the rising temperatures was big and getting bigger.
“The response is faster than we thought, but it is still not fast enough to keep up with climate change,” he said.
The northward shift of most species “is most likely changing at its maximal possible rate, which is insufficient to catch up to climate change,” Devictor said.
“This discrepancy may have profound consequences on the ability of species to cope with climate change in the long run.”
He used material from France’s French Breeding Bird Survey, which has gathered data collected by hundreds of ornithologists from more than 1,500 well-defined plots since 1989, in his study.
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