02234naa a2200337 a 450000100080000000500110000800800410001902400310006010000150009124500970010626000090020350000250021252012490023765000150148665000300150165000170153165000150154865000290156365300150159265300300160765300170163765300150165470000160166970000220168570000140170770000260172170000140174770000160176170000160177777301030179310131682015-12-08       2011    bl uuuu     u00u1 u    #d7 a10.3390/ijerph81038442DOI1 aPAREJA, L.  aDetection of pesticides in active and depopulated beehives in Uruguayh[electronic resource]  c2011  aOPEN ACCESS ARTICLE.  aABSTRACT:  The influence of insecticides commonly used for agricultural purposes on beehive depopulation in Uruguay was investigated. Honeycombs, bees, honey and propolis from depopulated hives were analyzed for pesticide residues, whereas from active beehives only honey and propolis were evaluated. A total of 37 samples were analyzed, representing 14,800 beehives. In depopulated beehives only imidacloprid and fipronil were detected and in active beehives endosulfan, coumaphos, cypermethrin, ethion and chlorpyrifos were found. Coumaphos was present in the highest concentrations, around 1,000 μg/kg, in all the propolis samples from active beehives. Regarding depopulated beehives, the mean levels of imidacloprid found in honeycomb (377 μg/kg, Standard Deviation: 118) and propolis (60 μg/kg, Standard Deviation: 57) are higher than those described to produce bee disorientation and fipronil levels detected in bees (150 and 170 μg/kg) are toxic per se. The other insecticides found can affect the global fitness of the bees causing weakness and a decrease in their overall productivity. These preliminary results suggest that bees exposed to pesticides or its residues can lead them in different ways to the beehive.  aAPICULTURA  aDESPOBLACIÓN DE COLMENAS  aINSECTICIDAS  aPESTICIDAS  aRESIDUOS DE AGROQUIMICOS  aAPICULTURA  aDESPOBLACIÓN DE COLMENAS  aINSECTICIDAS  aPESTICIDAS1 aCOLAZZO, M.1 aPÉREZ-PARADA, A.1 aNIELL, S.1 aCARRASCO-LETELIER, L.1 aBESIL, N.1 aCESIO, M.V.1 aHEINZEN, H.  tInternational Journal of Environmental Research and Public Health, 2011gv. 8, n. 10, p. 3844-3858