Social Media Sidebar

Announcement

Please sign up, comment on articles and bring your friends!

Current poll

PlanetTech is asking:

What do you think about our new web site?

Love it, indeed
Really good solution
Same as old one
The old one was better
This is a new option

Quote of the day

Just because something doesn’t do what you planned it to do doesn’t mean it’s useless.

 

Thomas Edison

Studies show how pesticides make bees lose their way

RATE THIS! +1
Posted in Science on 31st Mar, 2012 06:39 AM by AlexMuller

In recent years, bee populations have been dropping rapidly, partly due to a phenomenon known as Colony Collapse Disorder. Scientists also fear pesticides are destroying bee populations, but it is not clear how they are causing damage.

 

 

Dave Goulson of Stirling University in Scotland, who led the British study, said some bumblebee species have declined hugely.

 

 

"In North America, several bumblebee species which used to be common have more or less disappeared from the entire continent," while in Britain, three species have become extinct, he said in a statement.

 

 

The threat to bee populations also extends to Asia, South America and the Middle East, experts say.

 

 

Bees are important pollinators of flowering plants, including many fruit and vegetable crops. A 2011 United Nations report estimated that bees and other pollinators such as butterflies, beetles or birds do work worth 153 billion euros ($203 billion) a year to the human economy.

 

 

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.

 

 

Henry said the findings raised important issues about pesticide authorization procedures.

 

 

"So far, they (the procedures) mostly require manufacturers to ensure that doses encountered on the field do not kill bees, but they basically ignore the consequences of doses that do not kill them but may cause behavioral difficulties," he said in a statement.



Read original article » Back to category

Comments

Author: Guest
Posted: 2013-10-25
+0
oQ9DGB Muchos Gracias for your blog article.Really thank you! Great. Reply


 

Recent headlines

  • Posted in Business on 2018-12-13 14:32:06
    China Mission in Lunar Orbit and May Race SpaceX for Next.....read more
    Posted in Business on 2018-12-13 14:20:51
    Apple will build a new $1 billion campus in Austin amid.....read more
    Posted in Science on 2018-12-09 23:56:38
    CRISPR Babies: Mankind's Next Giant Leap?..read more
    Posted in Hardware on 2018-12-07 14:22:16
    SpaceX Successfully Launches to Space Station But Rocket.....read more
    Posted in Science on 2018-12-07 14:17:51
    Simulated One Gravity Living on the Moon and Mars With a.....read more
Posted in Business on 2013-10-10 01:33
China is working towards a manned lunar mission in about.....read more
Posted in Business on 2013-10-20 07:17
Spacex says China is their main competitor for commercial.....read more
Posted in Software on 2013-10-20 06:43
Pirate Bay Browser Clocks 1,000,000 Downloads..read more
Posted in Medicine on 2013-10-10 02:10
Google reportedly investing hundreds of millions into new.....read more
Posted in Medicine on 2013-10-14 03:13
Endothelial Cells Can Repair and Regenerate Organs,.....read more
Posted in Science on 01.01.2010
Spacex says China is their main competitor for commercial.....read more
Posted in Science on 01.01.2010
Staring at Your Phone Could Be Making You Short Sighted..read more
Posted in Science on 01.01.2010
Oculus Rift virtual reality headset coming to mobile, but.....read more
Posted in Science on 01.01.2010
China is working towards a manned lunar mission in about.....read more
Posted in Science on 01.01.2010
Delivering drugs via nanoparticles to target mitochondria..read more

Recent Blog Posts

  • Posted by AlexMuller
    Even light drinking increases risk of death..read more
    Posted by AlexMuller
    Researchers have discovered how to slow aging..read more
    Posted by AlexMuller
    Human retinas grown in a dish explain how color vision develops..read more
    Posted by AlexMuller
    The smartphone app that can tell you’re depressed before you.....read more
    Posted by AlexMuller
    Neural networks don’t understand what optical illusions are..read more

Login to your Account

Login to your PlanetTech Account here

Username:
Password:
Remember me
or

Create a New Account

You just need username and password

The following errors occured:
Username:
Email:
Password:
Verify password:
Remember me