On 08/06/2012 15:26, Bill T wrote:
> [...] since bees are affected by nectar
> sources with neonics at specific concentrations as shown in the RFID
> studies, and that effect seems to be fairly quick as the bees are
> disoriented and do not make it back to the hive. That would seem to
> indicate that the pesticide has entered the bee's system before moving from
> the crop.
>
The same problem is raised by the recent EFSA statement
dx.doi.org/10.2903/j.efsa.2012.2752 .
EFSA linked neonicotinoid absorption to the sugar requirements of
forager bees, referring to Rortais et al. (2005
http://dx.doi.org/10.1051/apido:2004071 ) but they do not consider the
possibility of diffusion from the crop to neighboring tissues.
To my knowledge the only studies on neonicotinoid kinetics are Suchail
et al. (2004 http://dx.doi.org/10.1002/ps.895) and Brunet et al. (2005
http://dx.doi.org/10.1002/ps.1046). Unluckily both studies do not
include the crop as a separate compartment in the distribution model, so
I believe there is still a lack of knowledge in the kinetic of
neonicotinoids and consequently in the exposition of forager bees.
Maybe someone who worked on the topic could provide us with more updated
information.
Umberto Vesco
DVM, PhD
Italy
--
Umberto Vesco
DVM, PhD
Italy
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