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Are Roses, Violets and Lilies Under Threat by Global Warming?
The study, by scientists at Harvard University, US, have found that different plant families near Walden Pond in Concord, Massachusetts, have borne the effects of climate change in strikingly different ways.
Over the past 150 years, some of the plants in Thoreau's woods have shifted their flowering time by as much as three weeks as spring temperatures have risen, the researchers say, while others have been less flexible.
Many plant families that have proven unable to adjust their flowering time have experienced sharp declines or even elimination from the local landscape.
"It had been thought that climate change would result in uniform shifts across plant species, but our work shows that plant species do not respond to climate change uniformly or randomly," said Charles C. Davis, assistant professor of organismic and evolutionary biology in Harvard's Faculty of Arts and Sciences.
"Some plants around Walden Pond have been quite resilient in the face of climate change, while others have fared far worse. Closely related species that are not able to adjust their flowering times in the face of rising temperatures are decreasing in abundance," he added.
Some 27 percent of all species Thoreau recorded in the mid-19th century are now locally extinct, and another 36 percent are so sparse that extinction may be imminent.
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