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Subject:
From:
Juanse Barros <[log in to unmask]>
Reply To:
Informed Discussion of Beekeeping Issues and Bee Biology <[log in to unmask]>
Date:
Thu, 28 Jun 2012 17:34:57 -0400
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Not sure if we have commented this one, it is fro January 2012 so probably
yes, but you know, mind volatile !
http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0029268
Multiple Routes of Pesticide Exposure for Honey Bees Living Near
Agricultural Fields
Abstract Top<http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0029268#top>

Populations of honey bees and other pollinators have declined worldwide in
recent years. A variety of stressors have been implicated as potential
causes, including agricultural pesticides. Neonicotinoid insecticides,
which are widely used and highly toxic to honey bees, have been found in
previous analyses of honey bee pollen and comb material. However, the
routes of exposure have remained largely undefined. We used LC/MS-MS to
analyze samples of honey bees, pollen stored in the hive and several
potential exposure routes associated with plantings of neonicotinoid
treated maize. Our results demonstrate that bees are exposed to these
compounds and several other agricultural pesticides in several ways
throughout the foraging period. During spring, extremely high levels of
clothianidin and thiamethoxam were found in planter exhaust material
produced during the planting of treated maize seed. We also found
neonicotinoids in the soil of each field we sampled, including unplanted
fields. Plants visited by foraging bees (dandelions) growing near these
fields were found to contain neonicotinoids as well. This indicates
deposition of neonicotinoids on the flowers, uptake by the root system, or
both. Dead bees collected near hive entrances during the spring sampling
period were found to contain clothianidin as well, although whether
exposure was oral (consuming pollen) or by contact (soil/planter dust) is
unclear. We also detected the insecticide clothianidin in pollen collected
by bees and stored in the hive. When maize plants in our field reached
anthesis, maize pollen from treated seed was found to contain clothianidin
and other pesticides; and honey bees in our study readily collected maize
pollen. These findings clarify some of the mechanisms by which honey bees
may be exposed to agricultural pesticides throughout the growing season.
These results have implications for a wide range of large-scale annual
cropping systems that utilize neonicotinoid seed treatments.

*Citation: *Krupke CH, Hunt GJ, Eitzer BD, Andino G, Given K (2012)
Multiple Routes of Pesticide Exposure for Honey Bees Living Near
Agricultural Fields. PLoS ONE 7(1): e29268. doi:10.1371/journal.pone.0029268

*Editor: *Guy Smagghe, Ghent University, Belgium

*Received:* August 18, 2011; *Accepted:* November 23, 2011;
*Published:* January
3, 2012


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Gracias


Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
[log in to unmask]

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