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Latest STEPHEN CARPENTER Stories

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2011-05-02 05:55:00

Researchers eavesdropping on complex signals from a remote Wisconsin lake have detected what they say is an unmistakable warning--a death knell--of the impending collapse of the lake's aquatic ecosystem. The finding, reported April 28 in the journal Science by a team of researchers led by Stephen Carpenter, an ecologist at the University of Wisconsin-Madison (UW-Madison), is the first experimental evidence that radical change in an ecosystem can be detected in advance, possibly in time to...

2011-04-28 21:27:55

Researchers eavesdropping on complex signals emanating from a remote Wisconsin lake have detected what they say is an unmistakable warning "” a death knell "” of the impending collapse of the lake's aquatic ecosystem. The finding, reported today (April 29) in the journal Science by a team of researchers led by Stephen Carpenter, a limnologist at the University of Wisconsin-Madison, is the first experimental evidence that radical change in an ecosystem can be detected in advance,...

2011-02-15 15:08:56

Recalculating the global use of phosphorous, a fertilizer linchpin of modern agriculture, a team of researchers warns that the world's stocks may soon be in short supply and that overuse in the industrialized world has become a leading cause of the pollution of lakes, rivers and streams. Writing in the Feb. 14 edition of the journal Environmental Research Letters, Stephen Carpenter of the University of Wisconsin-Madison and Elena Bennett of McGill University report that the human use of...

2010-11-01 22:33:01

Nature's capacity to store carbon, the element at the heart of global climate woes, is steadily eroding as the world's farmers expand croplands at the expense of native ecosystem such as forests. The tradeoff between agricultural production and maintaining nature's carbon reservoirs "“ native trees, plants and their carbon-rich detritus in the soil "“ is becoming more pronounced as more and more of the world's natural ecosystems succumb to the plow. The problem, experts say, is...

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2009-09-02 14:53:50

Scientists identify 'tipping points' at which sudden shifts to new conditions occur What do abrupt changes in ocean circulation and Earth's climate, shifts in wildlife populations and ecosystems, the global finance market and its system-wide crashes, and asthma attacks and epileptic seizures have in common? According to a paper published this week in the journal Nature, all share generic early-warning signals that indicate a critical threshold of change dead ahead. In the paper, Martin...

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2005-06-14 06:56:58

MADISON, Wis. -- Farmers' routine application of chemical fertilizers and manure to the land poses a far greater environmental problem to freshwater lakes than previously thought, potentially polluting the water for hundreds of years, according to research published Monday. Phosphorus in those substances has built up in the soil and will slowly end up in many lakes, where the nutrients lead to plant and algae growth in the water. The environmental problem, known as eutrophication, can turn...