Reuters / ABC - Four previously abundant species of bumblebee are close to disappearing in the United States, researchers reported on Monday in a study confirming that the agriculturally important bees are being affected worldwide.
They documented a 96 percent decline in the numbers of the four species, and said their range had shrunk by as much as 87 percent. As with honeybees, a pathogen is partly involved, but the researchers also found evidence the bees are vulnerable to inbreeding caused by habitat loss.
"We provide incontrovertible evidence that multiple Bombus species have experienced sharp population declines at the national level," the researchers reported in the Proceedings of the National Academy of Sciences, calling the findings "alarming."
"These are one of the most important pollinators of native plants," Sydney Cameron of the University of Illinois, Urbana, who led the study, said in a telephone interview.
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Honey bees are the most economically valuable pollinators of agricultural crops worldwide. Scientists at universities and the U.S. Department of Agriculture (USDA) frequently assert that bee pollination is involved in about one-third of the U.S. diet, and contributes to the production of a wide range of fruits, vegetables, tree nuts, forage crops, some field crops, and other specialty crops. The monetary value of honey bees as commercial pollinators in the United States is estimated at about $15-$20 billion annually.
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USDA researchers focus on 3 major possibilities: Bee Colony Collapse Disorder
- pesticides that may be having unexpected negative effects on honey bees;
- a new parasite or pathogen that may be attacking honey bees, such as the parasite Nosema ceranae or viruses; and
- combination of existing stresses that may compromise the immune system of bees and disrupt their social system, making colonies more susceptible to disease and collapse. Stresses could include high levels of infection by the Varroa mite; poor nutrition due to apiary overcrowding, pollination of crops with low nutritional value, or pollen or nectar scarcity; exposure to limited or contaminated water supplies; and migratory stress.














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Fred Upton (R-MI) is the incoming chairman of the Energy and Commerce Committee in the US House of Representatives...has dramatically changed his views on regulating carbon emissions over the past several months, evolving from a position that "[c]limate change is a serious problem that necessitates serious solutions" in April 2009 to writing in the Wall Street Journal this week that he opposes any regulation of carbon emissions, and that if the EPA did so, it would be an "unconstitutional power grab that will kill millions of jobs."-
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