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Assisted colonization may save animals

AN experiment relocating butterfly colonies in Britain shows that animals and plants can be moved to new, cooler habitats to help them survive global warming, scientists said yesterday.

"Very many species around the world are moving because of climate change. But they are often moving slowly, lagging behind shifts in the climate," said Chris Thomas, professor of Conservation Biology at the University of York.

Assisted colonization ?? moving creatures or plants to a habitat that has become suitable because of global warming ?? could help to safeguard wildlife and avert extinctions, he said.

In an experiment, batches of marbled white and small skipper butterflies were caught in north England in 1999 and 2000 and taken up to 65 kilometers beyond their habitat, to areas identified as suitable by computer climate models.

"Both populations have become established and are thriving," said Brian Huntley, a professor of environmental changes at the University of Durham who was among the authors of a study published in the journal Conservation Letters.

Some types of animals and plants were simply unable to move to search out new habitats, the study said. Marbled whites, for instance, like limited habitats such as grass growing on a limestone base.

The scientists said that it was the first example of assisted colonization linked to climate change, including assessments in advance to judge if the new arrivals would disrupt the new habitat.

Global warming, stoked by emissions of greenhouse gases from burning fossil fuels, is driving many species toward the poles as part of shifts that could disrupt food production.

Thomas said that assisted colonization could be applied anywhere, from Australian tropical forests to coral reefs. It could be costly but cheaper than allowing species to dwindle to numbers where they have to be bred in zoos.


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