Pesticides Make Bees Lose Their Way
March 31st, 2012Via: Reuters:
Scientists have discovered ways in which even low doses of widely used pesticides can harm bumblebees and honeybees, interfering with their homing abilities and making them lose their way.
In two studies published in the journal Science on Thursday, British and French researchers looked at bees and neonicotinoid insecticides – a class introduced in the 1990s now among the most commonly used crop pesticides in the world.
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In the first of the Science studies, a University of Stirling team exposed developing colonies of bumblebees to low levels of a neonicotinoid called imidacloprid, and then placed the colonies in an enclosed field site where the bees could fly around collecting pollen under natural conditions for six weeks.
At the beginning and end of the experiment, the researchers weighed each of the bumblebee nests – which included the bees, wax, honey, bee grubs and pollen – to see how much the colony had grown.
Compared to control colonies not exposed to imidacloprid, the researchers found the treated colonies gained less weight, suggesting less food was coming in.
The treated colonies were on average eight to 12 percent smaller than the control colonies at the end of the experiment, and also produced about 85 percent fewer queens – a finding that is key because queens produce the next generation of bees.
In the separate study, a team led by Mickael Henry of the French National Institute for Agricultural Research (INRA) in Avignon tagged free-ranging honeybees with tiny radio-frequency identification microchips glued to each bee’s back. This allowed them to track the bees as they came and went from hives.
The researchers gave some of the bees a low dose of the neonicotinoid pesticide thiamethoxam which they knew would not kill them and compared them to a control group of bees that was not exposed to the pesticide.
The treated bees were about two to three times more likely to die while away from their nests, and the researchers said this was probably because the pesticide interfered with the bees’ homing systems, so they couldn’t find their way home.
