Effects of Environmentally-Relevant Mixtures of 4 Common Organophosphorus...

Abstract We assessed whether exposure to environmentally-relevant mixtures of four organophosphorus insecticides (OPs) exerted adverse effects on honey bees. Adult and worker bees were orally exposed for five days under laboratory conditions to mixtures of four insecticides, diazinon, malathion, profenofos and chlorpyrifos at two concentrations. Concentration in the mixtures tested were equivalent to the median…

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In-depth proteomic analysis of Varroa destructor: Detection of...

Abstract We investigated pathogens in the parasitic honeybee mite Varroa destructor using nanoLC-MS/MS (TripleTOF) and 2D-E-MS/MS proteomics approaches supplemented with affinity-chromatography to concentrate trace target proteins. Peptides were detected from the currently uncharacterized Varroa destructor Macula-like virus (VdMLV), the deformed wing virus (DWV)-complex and the acute bee paralysis virus (ABPV). Peptide alignments revealed detection of complete structural DWV-complex block…

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Effect of oxalic acid on Nosema ceranae infection

Abstract Nosema ceranae is a honey bee pathogen parasitizing the ventricular epithelium and potentially causing colony death. The effect of 0.25 M oxalic acid solution administered to the bees in the form of sugar syrup was determined in laboratory and field trials. The spore numbers in an 8-day laboratory experiment were significantly lower when AO was administered…

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The genomes of two key bumblebee species with...

Abstract Background The shift from solitary to social behavior is one of the major evolutionary transitions. Primitively eusocial bumblebees are uniquely placed to illuminate the evolution of highly eusocial insect societies. Bumblebees are also invaluable natural and agricultural pollinators, and there is widespread concern over recent population declines in some species. High-quality genomic data will…

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Relating climatic factors to foraging behavior of bees...

Abstract The present study was conducted at Mekelle Agricultural Research Center with the objective of determining the foraging behavior of local honeybees in relation to climatic factors. This was done during the blooming time of Guzotia abyssinica (LF). The data were collected during five observations at time intervals of: 8:30-3:30 AM, 10:30-11:30AM, 12:30-13:30PM, 14:30-15:30 PM…

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Dynamic of the Presence of Israeli Acute Paralysis...

Abstract The determinants of Colony Collapse Disorder (CCD), a particular case of collapse of honey bee colonies, are still unresolved. Viruses including the Israeli acute paralysis virus (IAPV) were associated with CCD. We found an apiary with colonies showing typical CCD characteristics that bore high loads of IAPV, recovered some colonies from collapse and tested…

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Presence of Nosema ceranae associated with honeybee queen...

Abstract Microsporidiosis caused by Nosema species is one of the factors threatening the health of the honeybee(Apis mellifera), which is an essential element in agriculture mainly due to its pollination function. Thedispersion of this pathogen may be influenced by many factors, including various aspects of beekeepingmanagement such as introduction of queens with different origin. Herein…

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