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Título: | A two-year monitoring of pesticide hazard in-hive: High honey bee mortality rates during insecticide poisoning episodes in apiaries located near agricultural settings |
Autor: | Calatayud-Vernich, Pau CSIC; Calatayud, Fernando; Simó, Enrique; Pascual-Aguilar, Juan; Picó, Yolanda CSIC ORCID | Palabras clave: | Pesticide hazard Honey bees Poisoning Insecticides Mortality |
Fecha de publicación: | oct-2019 | Editor: | Elsevier | Citación: | Chemosphere 232: 471-480 (2019) | Resumen: | Pesticide residues in beebread, live and dead honey bees, together with honey bee death rate were monitored from June 2016 to June 2018 in three apiaries, located near agricultural settings and in wildlands. Dead honey bees were only collected and analyzed when significant mortality episodes occurred and pesticide content in beeswax of each experimental apiary was evaluated at the beginning of the study. Samples were extracted by a modified QuEChERS procedure and screened for pesticides residues by liquid chromatography mass spectrometry (LC-MS/MS). Pesticide hazard in the samples was evaluated through the hazard quotient approach (HQ). Beebread was widely contaminated with coumaphos and amitraz degradate 2, 4-dimethylphenylformamide (DMF), miticides detected in 94 and 97% of samples respectively. However, insecticides sprayed during citrus bloom like chlorpyrifos (up to 167 ng g )and dimethoate (up to 34 ng g )were the main responsible of the relevant pesticide hazard in this matrix. Pesticide levels in live bees were mostly residual, and pesticide hazard was low. Beeswax of the apiaries, contaminated by miticides, revealed a low pesticide hazard to honey bee colonies. Acute mortality episodes occurred only in the two apiaries located near agricultural settings. Dead bees collected during these episodes revealed high levels (up to 2700 ng g )of chlorpyrifos, dimethoate, omethoate and imidacloprid. HQ calculated in dead bees exceeded up to 37 times the threshold value considered as elevated hazard to honey bee health. | Versión del editor: | http://dx.doi.org/10.1016/j.chemosphere.2019.05.170 | URI: | http://hdl.handle.net/10261/201283 | DOI: | 10.1016/j.chemosphere.2019.05.170 | Identificadores: | doi: 10.1016/j.chemosphere.2019.05.170 issn: 1879-1298 |
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