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solonavi 21 August 2008 Climate, Endangered & Extinction, Global Warming 969 views One Comment Print This Post  Email This Post

Discovery

The habitats of wild bird species are shifting in response to global warming, but not fast enough to keep pace with rising temperatures, according to a study released Wednesday.

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.

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These “mismatches” are likely to become greater over time, and could eventually threaten some birds with extinction, he added.

The study showed that the geographic range of 105 birds species in France — accounting for 99.5 percent of the country’s wild avian population — moved north, on average, 91 kilometers (56.5 miles) from 1989 through 2006.

Average temperatures, however, shifted northward 273 kilometers (170 miles) over the same period, nearly three times farther.

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Earlier studies looked at the impact of global warming by comparing “snapshots” — taken years or decades apart — of the range across which a given species lived.

But trying to define the outer boundary of a shifting habitat is extremely difficult because data is, by definition, scarce.

Devictor took another approach, taking advantage of France’s French Breeding Bird Survey, which has gathered data collected by hundreds of ornithologists from more than 1500 well-defined plots since 1989.

This made it possible to look at the entire distribution of a species over a continuous period, he explained.

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.”

The study was published in the British journal Proceedings of The Royal Society B: Biological Sciences.