Thursday, May 15, 2008

Study pinpoints changes from climate warming

Human-generated climate change made flowers bloom sooner and autumn leaves fall later, turned some polar bears into cannibals and some birds into early breeders, a vast global study reported on Wednesday. Hundreds of previous studies have noted these specific changes and most suggested a link to so-called anthropogenic global warming, but a new analysis published in the journal Nature correlated these earlier studies with changes in temperature, the study's lead author said. There was a close relationship between temperature shifts between 1970 and 2004 and changes in plants, animals and the physical world, such as the retreat of glaciers and the water level in desert lakes, the study found.
Building on research done to support findings reported in 2007 by the UN's Intergovernmental Panel on Climate Change, Rosenzweig and her co-authors brought together nearly 30,000 sets of data about biological and physical changes around the world, and then matched that up with a detailed database of global temperature change.
* NORTH AMERICA: Earlier plant flowering of 89 species from American holly to sassafras; intraspecific predation, cannibalism and declining population of polar bears; earlier breeding and arrival dates of birds including robins and Canada geese.
* EUROPE: Glacier melting in the Alps; changes in 19 countries of leaf-unfolding and flowering of such plants as hazel, lilac, apple, linden and birch; early pollen release in the Netherlands; long-term changes in fish communities in Upper Rhone River.
* ASIA: Greater growth of Siberian pines in Mongolia; earlier break-up and thinning of river and lake ice in Mongolia; change in freeze depth of permafrost in Russia; earlier flowering of gingko in Japan.
* SOUTH AMERICA: Glacier wastage in Peru; melting Patagonia ice fields contributing to sea-level rise.
* AFRICA: Decreasing aquatic ecosystem productivity of Lake Tanganyika.
* AUSTRALIA: Early arrival of migratory birds including flycatchers and fantails; declining water levels in Western Victoria.
* ANTARCTICA: 50 per cent decline in population of emperor penguins on Antarctic Peninsula; retreating glaciers.

No comments: