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https://www.readbyqxmd.com/read/28403242/brain-metabolomic-profiling-of-eastern-honey-bee-apis-cerana-infested-with-the-mite-varroa-destructor
#1
Jiang-Li Wu, Chun-Xue Zhou, Peng-Jie Wu, Jin Xu, Yue-Qin Guo, Fei Xue, Awraris Getachew, Shu-Fa Xu
The mite Varroa destructor is currently the greatest threat to apiculture as it is causing a global decrease in honey bee colonies. However, it rarely causes serious damage to its native hosts, the eastern honey bees Apis cerana. To better understand the mechanism of resistance of A. cerana against the V. destructor mite, we profiled the metabolic changes that occur in the honey bee brain during V. destructor infestation. Brain samples were collected from infested and control honey bees and then measured using an untargeted liquid chromatography-tandem mass spectrometry (LC-MS/MS)-based global metabolomics method, in which 7918 and 7462 ions in ESI+ and ESI- mode, respectively, were successfully identified...
2017: PloS One
https://www.readbyqxmd.com/read/28401377/a-mathematical-model-of-forager-loss-in-honeybee-colonies-infested-with-varroa-destructor-and-the-acute-bee-paralysis-virus
#2
Vardayani Ratti, Peter G Kevan, Hermann J Eberl
We incorporate a mathematical model of Varroa destructor and the Acute Bee Paralysis Virus with an existing model for a honeybee colony, in which the bee population is divided into hive bees and forager bees based on tasks performed in the colony. The model is a system of five ordinary differential equations with dependent variables: uninfected hive bees, uninfected forager bees, infected hive bees, virus-free mites and virus-carrying mites. The interplay between forager loss and disease infestation is studied...
April 11, 2017: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/28393875/oldest-varroa-tolerant-honey-bee-population-provides-insight-into-the-origins-of-the-global-decline-of-honey-bees
#3
L E Brettell, S J Martin
The ecto-parasitic mite Varroa destructor has transformed the previously inconsequential Deformed Wing Virus (DWV) into the most important honey bee viral pathogen responsible for the death of millions of colonies worldwide. Naturally, DWV persists as a low level covert infection transmitted between nest-mates. It has long been speculated that Varroa via immunosuppression of the bees, activate a covert infection into an overt one. Here we show that despite Varroa feeding on a population of 20-40 colonies for over 30 years on the remote island of Fernando de Noronha, Brazil no such activation has occurred and DWV loads have remained at borderline levels of detection...
April 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28388479/effects-of-bacillus-thuringiensis-strains-virulent-to-varroa-destructor-on-larvae-and-adults-of-apis-mellifera
#4
Eva Vianey Alquisira-Ramírez, Guadalupe Peña-Chora, Víctor Manuel Hernández-Velázquez, Andrés Alvear-García, Iván Arenas-Sosa, Ramón Suarez-Rodríguez
The sublethal effects of two strains of Bacillus thuringiensis, which were virulent in vitro to Varroa destructor, were measured on Apis mellifera. The effects of five concentrations of total protein (1, 5, 25, 50 and 100μg/mL) from the EA3 and EA26.1 strains on larval and adult honey bees were evaluated for two and seven days under laboratory conditions. Based on the concentrations evaluated, total protein from the two strains did not affect the development of larvae, the syrup consumption, locomotor activity or proboscis extension response of adults...
April 4, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28387332/odorant-cues-linked-to-social-immunity-induce-lateralized-antenna-stimulation-in-honey-bees-apis-mellifera-l
#5
Alison McAfee, Troy F Collins, Lufiani L Madilao, Leonard J Foster
Hygienic behaviour (HB) is a social immunity trait in honey bees (Apis mellifera L.) whereby workers detect, uncap and remove unhealthy brood, improving disease resistance in the colony. This is clearly economically valuable; however, the molecular mechanism behind it is not well understood. The freeze-killed brood (FKB) assay is the conventional method of HB selection, so we compared odour profiles of FKB and live brood to find candidate HB-inducing odours. Surprisingly, we found that significantly more brood pheromone (β-ocimene) was released from FKB...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28361244/condition-dependent-virulence-of-slow-bee-paralysis-virus-in-bombus-terrestris-are-the-impacts-of-honeybee-viruses-in-wild-pollinators-underestimated
#6
Robyn Manley, Mike Boots, Lena Wilfert
Slow bee paralysis virus (SBPV)-previously considered an obligate honeybee disease-is now known to be prevalent in bumblebee species. SBPV is highly virulent in honeybees in association with Varroa mites, but has been considered relatively benign otherwise. However, condition-dependent pathogens can appear asymptomatic under good, resource abundant conditions, and negative impacts on host fitness may only become apparent when under stressful or resource-limited conditions. We tested whether SBPV expresses condition-dependent virulence in its bumblebee host, Bombus terrestris, by orally inoculating bees with SBPV and recording longevity under satiated and starvation conditions...
March 30, 2017: Oecologia
https://www.readbyqxmd.com/read/28356346/biophysical-characterization-of-the-varroa-destructor-nav1-sodium-channel-and-its-affinity-for-%C3%AF-fluvalinate-insecticide
#7
Pascal Gosselin-Badaroudine, Mohamed Chahine
The decline of the western honeybee (Apis mellifera) has been reported to be due to parasitism by Varroa destructor mites and to colony collapse disorder in which these mites may be involved. In-hive chemicals such as τ-fluvalinate are being used to control Vdestructor populations. This approach may lead to the chronic exposure of bees to this liposoluble chemical, which tends to accumulate in hives. We cloned a variant of the V. destructor sodium channel (VdNav1) and studied its biophysical characteristics and sensitivity to τ-fluvalinate using the Xenopus oocyte expression system and the 2-microelectrode voltage-clamp technique...
March 29, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/28334400/a-bio-economic-case-study-of-canadian-honey-bee-hymenoptera-apidae-colonies-marker-assisted-selection-mas-in-queen-breeding-affects-beekeeper-profits
#8
Miriam Bixby, Kathy Baylis, Shelley E Hoover, Rob W Currie, Andony P Melathopoulos, Stephen F Pernal, Leonard J Foster, M Marta Guarna
Over the past decade in North America and Europe, winter losses of honey bee (Hymenoptera: Apidae) colonies have increased dramatically. Scientific consensus attributes these losses to multifactorial causes including altered parasite and pathogen profiles, lack of proper nutrition due to agricultural monocultures, exposure to pesticides, management, and weather. One method to reduce colony loss and increase productivity is through selective breeding of queens to produce disease-, pathogen-, and mite-resistant stock...
March 16, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334279/population-growth-of-varroa-destructor-acari-varroidae-in-colonies-of-russian-and-unselected-honey-bee-hymenoptera-apidae-stocks-as-related-to-numbers-of-foragers-with-mites
#9
Gloria DeGrandi-Hoffman, Fabiana Ahumada, Robert Danka, Mona Chambers, Emily Watkins DeJong, Geoff Hidalgo
Varroa (Varroa destructor Anderson and Trueman) is an external parasite of honey bees (Apis mellifera L.) and a leading cause of colony losses worldwide. Varroa populations can be controlled with miticides, but mite-resistant stocks such as the Russian honey bee (RHB) also are available. Russian honey bee and other mite-resistant stocks limit Varroa population growth by affecting factors that contribute to mite reproduction. However, mite population growth is not entirely due to reproduction. Numbers of foragers with mites (FWM) entering and leaving hives also affect the growth of mite populations...
March 20, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28334185/ecology-life-history-and-management-of-tropilaelaps-mites
#10
Lilia I de Guzman, Geoffrey R Williams, Kitiphong Khongphinitbunjong, Panuwan Chantawannakul
Parasitic mites are the major threat to the Western honey bee, Apis mellifera L. For much of the world, Varroa destructor Anderson & Trueman single-handedly inflicts unsurmountable problems to A. mellifera beekeeping. However, A. mellifera in Asia is also faced with another genus of destructive parasitic mite, Tropilaelaps. The life history of these two parasitic mites is very similar, and both have the same food requirements (i.e., hemolymph of developing brood). Hence, parasitism by Tropilaelaps spp., especially Tropilaelaps mercedesae and Tropilaelaps clareae, also results in death of immature brood or wing deformities in infested adult bees...
April 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28327890/draft-genome-of-the-honey-bee-ectoparasitic-mite-tropilaelaps-mercedesae-is-shaped-by-the-parasitic-life-history
#11
Xiaofeng Dong, Stuart D Armstrong, Dong Xia, Benjamin L Makepeace, Alistair C Darby, Tatsuhiko Kadowaki
The number of managed honey bee colonies has considerably decreased in many developed countries in recent years and ectoparasitic mites are considered as major threats to honey bee colonies and health. However, their general biology remains poorly understood. We sequenced the genome of Tropilaelaps mercedesae, the prevalent ectoparasitic mite infesting honey bees in Asia, and predicted 15 190 protein-coding genes that were well supported by the mite transcriptomes and proteomic data. Although amino acid substitutions have been accelerated within the conserved core genes of two mites, T...
March 1, 2017: GigaScience
https://www.readbyqxmd.com/read/28287445/bee-an-object-oriented-agent-based-simulator-for-honey-bee-colonies
#12
Matthew Betti, Josh LeClair, Lindi M Wahl, Mair Zamir
We present a model and associated simulation package (www.beeplusplus.ca) to capture the natural dynamics of a honey bee colony in a spatially-explicit landscape, with temporally-variable, weather-dependent parameters. The simulation tracks bees of different ages and castes, food stores within the colony, pollen and nectar sources and the spatial position of individual foragers outside the hive. We track explicitly the intake of pesticides in individual bees and their ability to metabolize these toxins, such that the impact of sub-lethal doses of pesticides can be explored...
March 10, 2017: Insects
https://www.readbyqxmd.com/read/28278255/a-pan-european-epidemiological-study-reveals-honey-bee-colony-survival-depends-on-beekeeper-education-and-disease-control
#13
Antoine Jacques, Marion Laurent, Magali Ribière-Chabert, Mathilde Saussac, Stéphanie Bougeard, Giles E Budge, Pascal Hendrikx, Marie-Pierre Chauzat
Reports of honey bee population decline has spurred many national efforts to understand the extent of the problem and to identify causative or associated factors. However, our collective understanding of the factors has been hampered by a lack of joined up trans-national effort. Moreover, the impacts of beekeeper knowledge and beekeeping management practices have often been overlooked, despite honey bees being a managed pollinator. Here, we established a standardised active monitoring network for 5 798 apiaries over two consecutive years to quantify honey bee colony mortality across 17 European countries...
2017: PloS One
https://www.readbyqxmd.com/read/28272333/a-comparison-of-deformed-wing-virus-in-deformed-and-asymptomatic-honey-bees
#14
Laura E Brettell, Gideon J Mordecai, Declan C Schroeder, Ian M Jones, Jessica R da Silva, Marina Vicente-Rubiano, Stephen J Martin
Deformed wing virus (DWV) in association with Varroa destructor is currently attributed to being responsible for colony collapse in the western honey bee (Apis mellifera). The appearance of deformed individuals within an infested colony has long been associated with colony losses. However, it is unknown why only a fraction of DWV positive bees develop deformed wings. This study concerns two small studies comparing deformed and non-deformed bees. In Brazil, asymptomatic bees (no wing deformity) that had been parasitised by Varroa as pupae had higher DWV loads than non-parasitised bees...
March 7, 2017: Insects
https://www.readbyqxmd.com/read/28270616/structure-of-deformed-wing-virus-a-major-honey-bee-pathogen
#15
Karel Škubník, Jiří Nováček, Tibor Füzik, Antonín Přidal, Robert J Paxton, Pavel Plevka
The worldwide population of western honey bees (Apis mellifera) is under pressure from habitat loss, environmental stress, and pathogens, particularly viruses that cause lethal epidemics. Deformed wing virus (DWV) from the family Iflaviridae, together with its vector, the mite Varroa destructor, is likely the major threat to the world's honey bees. However, lack of knowledge of the atomic structures of iflaviruses has hindered the development of effective treatments against them. Here, we present the virion structures of DWV determined to a resolution of 3...
March 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28249569/unity-in-defence-honeybee-workers-exhibit-conserved-molecular-responses-to-diverse-pathogens
#16
Vincent Doublet, Yvonne Poeschl, Andreas Gogol-Döring, Cédric Alaux, Desiderato Annoscia, Christian Aurori, Seth M Barribeau, Oscar C Bedoya-Reina, Mark J F Brown, James C Bull, Michelle L Flenniken, David A Galbraith, Elke Genersch, Sebastian Gisder, Ivo Grosse, Holly L Holt, Dan Hultmark, H Michael G Lattorff, Yves Le Conte, Fabio Manfredini, Dino P McMahon, Robin F A Moritz, Francesco Nazzi, Elina L Niño, Katja Nowick, Ronald P van Rij, Robert J Paxton, Christina M Grozinger
BACKGROUND: Organisms typically face infection by diverse pathogens, and hosts are thought to have developed specific responses to each type of pathogen they encounter. The advent of transcriptomics now makes it possible to test this hypothesis and compare host gene expression responses to multiple pathogens at a genome-wide scale. Here, we performed a meta-analysis of multiple published and new transcriptomes using a newly developed bioinformatics approach that filters genes based on their expression profile across datasets...
March 2, 2017: BMC Genomics
https://www.readbyqxmd.com/read/28216419/seasonal-cycle-of-inbreeding-and-recombination-of-the-parasitic-mite-varroa-destructor-in-honeybee-colonies-and-its-implications-for-the-selection-of-acaricide-resistance
#17
Alexis L Beaurepaire, Klemens J Krieger, Robin F A Moritz
Varroa destructor is the most devastating parasite of the Western honeybee, Apis mellifera. In the light of the arm race opposing the host and its parasite, the population dynamics and genetic diversity of these organisms are key parameters. However, the life cycle of V. destructor is characterized by extreme inbreeding due to full sibling mating in the host brood cells. We here present an equation reflecting the evolution of inbreeding in such a clonal system, and compare our predictions with empirical data based on the analysis of seven microsatellite markers...
February 20, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28178181/inside-honeybee-hives-impact-of-natural-propolis-on-the-ectoparasitic-mite-varroa-destructor-and-viruses
#18
Nora Drescher, Alexandra-Maria Klein, Peter Neumann, Orlando Yañez, Sara D Leonhardt
Social immunity is a key factor for honeybee health, including behavioral defense strategies such as the collective use of antimicrobial plant resins (propolis). While laboratory data repeatedly show significant propolis effects, field data are scarce, especially at the colony level. Here, we investigated whether propolis, as naturally deposited in the nests, can protect honeybees against ectoparasitic mites Varroa destructor and associated viruses, which are currently considered the most serious biological threat to European honeybee subspecies, Apis mellifera, globally...
February 6, 2017: Insects
https://www.readbyqxmd.com/read/28168846/performance-of-honey-bee-colonies-under-a-long-lasting-dietary-exposure-to-sublethal-concentrations-of-the-neonicotinoid-insecticide-thiacloprid
#19
Reinhold Siede, Lena Faust, Marina D Meixner, Christian Maus, Bernd Grünewald, Ralph Büchler
BACKGROUND: Substantial honey bee colony losses have occurred periodically in the last decades. The drivers for these losses are not fully understood. The influence of pests and pathogens are beyond dispute, but in addition, chronic exposure to sublethal concentrations of pesticides has been suggested to affect the performance of honey bee colonies. This study aims to elucidate the potential effects of a chronic exposure to sublethal concentrations (one realistic worst-case concentration) of the neonicotinoid thiacloprid to honey bee colonies in a three year replicated colony feeding study...
February 7, 2017: Pest Management Science
https://www.readbyqxmd.com/read/28158303/field-efficacy-of-acaricides-against-varroa-destructor
#20
María Jesús Gracia, Carlos Moreno, Montserrat Ferrer, Alfredo Sanz, Miguel Ángel Peribáñez, Rosa Estrada
Field trials were conducted in Northeast Spain (Aragón) to evaluate the effectiveness of two acaricides against Varroa destructor. These experiments took into account the season of the year, apiary, colony, and developmental state and strength of the colony. The acaricides used were a synthetic (amitraz, Apivar®) and a natural (formulated from Api Life Var®, thymol oil and thymol alcohol) product. The treatments used in the present study reduce high infestations of V. destructor, although they do not eliminate the infestation...
2017: PloS One
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