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Ecosystems strain to keep pace with climate: study

Ecosystems strain to keep pace with climate: study
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First Published: Thu, Dec 24 2009. 11 17 PM IST
Updated: Thu, Dec 24 2009. 11 17 PM IST
Los Angeles: Earth’s various ecosystems, with all their plants and animals, will need to shift about a quarter-mile (.42 km) per year on average to keep pace with global climate change, scientists said in a study released on Wednesday.
How well particular species can survive rising worldwide temperatures attributed to excess levels of heat-trapping “greenhouse” gases emitted by human activity hinges on those species’ ability to migrate or adapt in place.
The farther individual species—from shrubs and trees to insects, birds and mammals — need to move to stay within their preferred climate, the greater their chance of extinction.
The study suggests scientists and governments should update habitat conservation strategies that have long emphasized drawing boundaries around environmentally sensitive areas and restricting development within those borders.
A more “dynamic” focus should be placed on establishing wildlife corridors and pathways linking fragmented habitats, said research co-author Healy Hamilton of the California Academy of Sciences.
“Things are on the move, faster than we anticipated,” she told Reuters. “This rate of projected climate change is just about the same as a slow-motion meteorite in terms of the speed at which it’s asking a species to respond.”
The new research suggests that denizens of mountainous habitats will experience the slowest rates of climate change because they can track relatively large swings in temperature by moving just a short distance up or down slope.
Thus, mountainous landscapes “may effectively shelter many species into the next century”, the scientists wrote in the study, which is to be published in Thursday’s issue of the journal Nature.
Climate change will be felt most swiftly by inhabitants of largely flat landscapes, such as mangroves and prairie grasslands, the study found.
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First Published: Thu, Dec 24 2009. 11 17 PM IST