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https://www.readbyqxmd.com/read/29147780/the-effect-of-removing-numerically-dominant-non-native-honey-bees-on-seed-set-of-a-native-plant
#1
Annika J Nabors, Henry J Cen, Keng-Lou J Hung, Joshua R Kohn, David A Holway
Pollination services are compromised by habitat destruction, land-use intensification, pesticides, and introduced species. How pollination services respond to such stressors depends on the capacity of pollinator assemblages to function in the face of environmental disruption. Here, we quantify how pollination services provided to a native plant change upon removal of the non-native, western honey bee (Apis mellifera)-a numerically dominant floral visitor in the native bee-rich ecosystems of southern California...
November 16, 2017: Oecologia
https://www.readbyqxmd.com/read/29145627/bacterial-communities-associated-with-the-ectoparasitic-mites-varroa-destructor-and-tropilaelaps-mercedesae-of-honey-bees-apis-mellifera
#2
Chonthicha Pakwan, Martin Kaltenpoth, Benjamin Weiss, Panuwan Chantawannakul, Guo Jun, Terd Disayathanoowat
Varroa and Tropilaelaps mites have been reported as serious ectoparasites of honey bees (Apis mellifera). In this study, bacterial communities associated with Varroa destructor and Tropilaelaps mercedesae from Northern Thailand were determined, using both culture-dependent and culture-independent approaches. Adult female mites were collected from apiaries in Chiang Mai and Lampang provinces. Culturable bacteria were isolated from individual mites. On average, we observed approximately 1340 and 1140 CFU/mite in Varroa and Tropilaelaps, respectively...
November 14, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/29143171/neonicotinoid-insecticides-in-pollen-honey-and-adult-bees-in-colonies-of-the-european-honey-bee-apis-mellifera-l-in-egypt
#3
Garry Codling, Yahya Al Naggar, John P Giesy, Albert J Robertson
Honeybee losses have been attributed to multiple stressors and factors including the neonicotinoid insecticides (NIs). Much of the study of hive contamination has been focused upon temperate regions such as Europe, Canada and the United States. This study looks for the first time at honey, pollen and bees collected from across the Nile Delta in Egypt in both the spring and summer planting season of 2013. There is limited information upon the frequency of use of NIs in Egypt but the ratio of positive identification and concentrations of NIs are comparable to other regions...
November 15, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/29142057/morphofunctional-experience-dependent-plasticity-in-the-honeybee-brain
#4
Mara Andrione, Benjamin F Timberlake, Giorgio Vallortigara, Renzo Antolini, Albrecht Haase
Repeated or prolonged exposure to an odorant without any positive or negative reinforcement produces experience-dependent plasticity, which results in habituation and latent inhibition. In the honeybee (Apis mellifera), it has been demonstrated that, even if the absolute neural representation of an odor in the primary olfactory center, the antennal lobe (AL), is not changed by repeated presentations, its relative representation with respect to unfamiliar stimuli is modified. In particular, the representation of a stimulus composed of a 50:50 mixture of a familiar and a novel odorant becomes more similar to that of the novel stimulus after repeated stimulus preexposure...
December 2017: Learning & Memory
https://www.readbyqxmd.com/read/29136042/effects-of-small-scale-clustering-of-flowers-on-pollinator-foraging-behaviour-and-flower-visitation-rate
#5
Asma Akter, Paolo Biella, Jan Klecka
Plants often grow in clusters of various sizes and have a variable number of flowers per inflorescence. This small-scale spatial clustering affects insect foraging strategies and plant reproductive success. In our study, we aimed to determine how visitation rate and foraging behaviour of pollinators depend on the number of flowers per plant and on the size of clusters of multiple plants using Dracocephalum moldavica (Lamiaceae) as a target species. We measured flower visitation rate by observations of insects visiting single plants and clusters of plants with different numbers of flowers...
2017: PloS One
https://www.readbyqxmd.com/read/29127660/exposure-to-a-sublethal-concentration-of-imidacloprid-and-the-side-effects-on-target-and-nontarget-organs-of-apis-mellifera-hymenoptera-apidae
#6
Aline Fernanda Catae, Thaisa Cristina Roat, Marcel Pratavieira, Anally Ribeiro da Silva Menegasso, Mario Sergio Palma, Osmar Malaspina
The use of insecticides has become increasingly frequent, and studies indicate that these compounds are involved in the intoxication of bees. Imidacloprid is a widely used neonicotinoid; thus, we have highlighted the importance of assessing its oral toxicity to Africanized bees and used transmission electron microscopy to investigate the sublethal effects in the brain, the target organ, and the midgut, responsible for the digestion/absorption of food. In addition, the distribution of proteins involved in important biological processes in the brain were evaluated on the 1st day of exposure by MALDI-imaging analysis...
November 10, 2017: Ecotoxicology
https://www.readbyqxmd.com/read/29126172/native-honey-bees-outperform-adventive-honey-bees-in-increasing-pyrus-bretschneideri-rosales-rosaceae-pollination
#7
Tolera Kumsa Gemeda, Youquan Shao, Wenqin Wu, Huipeng Yang, Jiaxing Huang, Jie Wu
The foraging behavior of different bee species is a key factor influencing the pollination efficiency of different crops. Most pear species exhibit full self-incompatibility and thus depend entirely on cross-pollination. However, as little is known about the pear visitation preferences of native Apis cerana (Fabricius; Hymenoptera: Apidae) and adventive Apis mellifera (L.; Hymenoptera: Apidae) in China. A comparative analysis was performed to explore the pear-foraging differences of these species under the natural conditions of pear growing areas...
November 6, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/29125881/chemical-and-cultural-control-of-tropilaelaps-mercedesae-mites-in-honeybee-apis-mellifera-colonies-in-northern-thailand
#8
Jeffery S Pettis, Robyn Rose, Veeranan Chaimanee
At least two parasitic mites have moved from Asian species of honeybees to infest Apis mellifera. Of these two, Varroa destructor is more widespread globally while Tropilaelaps mercedesae has remained largely in Asia. Tropilaelaps mites are most problematic when A. mellifera is managed outside its native range in contact with Asian species of Apis. In areas where this occurs, beekeepers of A. mellifera treat aggressively for Tropilaelaps and Varroa is either outcompeted or is controlled as a result of the aggressive treatment regime used against Tropilaelaps...
2017: PloS One
https://www.readbyqxmd.com/read/29123242/field-relevant-doses-of-the-systemic-insecticide-fipronil-and-fungicide-pyraclostrobin-impair-mandibular-and-hypopharyngeal-glands-in-nurse-honeybees-apis-mellifera
#9
Rodrigo Zaluski, Luis Antonio Justulin, Ricardo de Oliveira Orsi
Global decreases in bee populations emphasize the importance of assessing how environmental stressors affect colony maintenance, especially considering the extreme task specialization observed in honeybee societies. Royal jelly, a protein secretion essential to colony nutrition, is produced by nurse honeybees, and development of bee mandibular glands, which comprise a reservoir surrounded by secretory cells and hypopharyngeal glands that are shaped by acini, is directly associated with production of this secretion...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29118416/protein-nutrition-governs-within-host-race-of-honey-bee-pathogens
#10
Manuel Tritschler, Jutta J Vollmann, Orlando Yañez, Nor Chejanovsky, Karl Crailsheim, Peter Neumann
Multiple infections are common in honey bees, Apis mellifera, but the possible role of nutrition in this regard is poorly understood. Microsporidian infections, which are promoted by protein-fed, can negatively correlate with virus infections, but the role of protein nutrition for the microsporidian-virus interface is unknown. Here, we challenged naturally deformed wing virus - B (DWV-B) infected adult honey bee workers fed with or without pollen ( = protein) in hoarding cages, with the microsporidian Nosema ceranae...
November 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29117379/inhibitory-effect-of-indole-analogs-against-paenibacillus-larvae-the-causal-agent-of-american-foulbrood-disease
#11
Israel Alvarado, Joseph W Margotta, Mai M Aoki, Fernando Flores, Fresia Agudelo, Guillermo Michel, Michelle M Elekonich, Ernesto Abel-Santos
Paenibacillus larvae, a Gram-positive bacterium, causes American foulbrood (AFB) in honey bee larvae (Apis mellifera Linnaeus [Hymenoptera: Apidae]). P. larvae spores exit dormancy in the gut of bee larvae, the germinated cells proliferate, and ultimately bacteremia kills the host. Hence, spore germination is a required step for establishing AFB disease. We previously found that P. larvae spores germinate in response to l-tyrosine plus uric acid in vitro. Additionally, we determined that indole and phenol blocked spore germination...
September 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/29117376/comparative-genomic-analysis-for-genetic-variation-in-sacbrood-virus-of-apis-cerana-and-apis-mellifera-honeybees-from-different-regions-of-vietnam
#12
Kondreddy Eswar Reddy, Ha Thi Thu, Mi Sun Yoo, Mummadireddy Ramya, Bheemireddy Anjana Reddy, Nguyen Thi Kim Lien, Nguyen Thi Phuong Trang, Bui Thi Thuy Duong, Hyun-Jeong Lee, Seung-Won Kang, Dong Van Quyen
Sacbrood virus (SBV) is one of the most common viral infections of honeybees. The entire genome sequence for nine SBV infecting honeybees, Apis cerana and Apis mellifera, in Vietnam, namely AcSBV-Viet1, AcSBV-Viet2, AcSBV-Viet3, AmSBV-Viet4, AcSBV-Viet5, AmSBV-Viet6, AcSBV-Viet7, AcSBV-Viet8, and AcSBV-Viet9, was determined. These sequences were aligned with seven previously reported complete genome sequences of SBV from other countries, and various genomic regions were compared. The Vietnamese SBVs (VN-SBVs) shared 91-99% identity with each other, and shared 89-94% identity with strains from other countries...
September 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/29117371/influence-of-the-neonicotinoid-insecticide-thiamethoxam-on-mirna-expression-in-the-honey-bee-hymenoptera-apidae
#13
Teng-Fei Shi, Yu-Fei Wang, Fang Liu, Lei Qi, Lin-Sheng Yu
MicroRNAs (miRNAs) are small endogenous noncoding single-stranded RNAs regulating gene expression in eukaryotes. They play important roles in regulating caste differentiation, behavior development, and immune defences in the honey bee, Apis mellifera (Linnaeus) (Hymenoptera: Apidae). In this study, we explored the effect of the neonicotinoid insecticide, thiamethoxam, on miRNA expression in this species using deep small RNA sequencing. The results showed that seven miRNAs were significantly differentially expressed (q-value <0...
September 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/29114209/the-biogenic-amine-tyramine-and-its-receptor-amtyr1-in-olfactory-neuropils-in-the-honey-bee-apis-mellifera-brain
#14
Irina T Sinakevitch, Sasha M Daskalova, Brian H Smith
This article describes the cellular sources for tyramine and the cellular targets of tyramine via the Tyramine Receptor 1 (AmTyr1) in the olfactory learning and memory neuropils of the honey bee brain. Clusters of approximately 160 tyramine immunoreactive neurons are the source of tyraminergic fibers with small varicosities in the optic lobes, antennal lobes, lateral protocerebrum, mushroom body (calyces and gamma lobes), tritocerebrum and subesophageal ganglion (SEG). Our tyramine mapping study shows that the primary sources of tyramine in the antennal lobe and calyx of the mushroom body are from at least two Ventral Unpaired Median neurons (VUMmd and VUMmx) with cell bodies in the SEG...
2017: Frontiers in Systems Neuroscience
https://www.readbyqxmd.com/read/29113738/quantitative-pcr-assessment-of-lotmaria-passim-in-apis-mellifera-colonies-co-infected-naturally-with-nosema-ceranae
#15
Branislav Vejnovic, Jevrosima Stevanovic, Ryan S Schwarz, Nevenka Aleksic, Milorad Mirilovic, Nemanja M Jovanovic, Zoran Stanimirovic
A recently described trypanosomatid species Lotmaria passim and the microsporidium Nosema ceranae infect the honey bee (Apis mellifera), but the interspecific dynamic of these two common gut parasites is unknown. In this study, a real-time qPCR assay was developed to enable the specific detection and quantification of L. passim. The annual dynamics of N. ceranae and L. passim infections were evaluated in ten A. mellifera colonies naturally infected with both parasites at one apiary in Serbia from March 2016 to March 2017...
November 4, 2017: Journal of Invertebrate Pathology
https://www.readbyqxmd.com/read/29113015/subfamily-dependent-alternative-reproductive-strategies-in-worker-honey-bees
#16
Boris Yagound, Michael Duncan, Nadine C Chapman, Benjamin P Oldroyd
Functional worker sterility is the defining feature of insect societies. Yet, workers are sometimes found reproducing in their own or foreign colonies. The proximate mechanisms underlying these alternative reproductive phenotypes are key to understanding how reproductive altruism and selfishness are balanced in eusocial insects. In this study we show that in honey bee (Apis mellifera) colonies the social environment of a worker, i.e. the presence and relatedness of the queens in a worker's natal colony and in surrounding colonies, significantly influences her fertility and drifting behaviour...
November 7, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/29110688/evaluation-of-physicochemical-and-antioxidant-properties-of-two-stingless-bee-honeys-a-comparison-with-apis-mellifera-honey-from-nsukka-nigeria
#17
Justus Amuche Nweze, J I Okafor, Emeka I Nweze, Julius Eyiuche Nweze
OBJECTIVE: Several physical, biochemical and antioxidant properties of two Nigerian stingless bee honey varieties (Melipona sp. and Hypotrigona sp.) were compared with Apis mellifera honey using standard analytical procedures. RESULTS: The mean pH of Apis mellifera, Hypotrigona sp. and Melipona sp. honeys were 4.24 ± 0.28, 3.75 ± 0.11 and 4.21 ± 0.37 respectively. The mean moisture contents of the honeys were 11.74 ± 0.47, 17.50 ± 0.80, and 13.86 ± 1...
November 6, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/29110379/a-comparison-of-honeybee-apis-mellifera-queen-worker-and-drone-larvae-by-rna-seq
#18
Xu-Jiang He, Wu-Jun Jiang, Mi Zhou, Andrew B Barron, Zhi-Jiang Zeng
Honeybees (Apis mellifera) have haplodiploid sex determination: males develop from unfertilized eggs and females develop from fertilized ones. The differences in larval food also determine the development of females. Here we compared the total somatic gene expression profiles of 2-day and 4-day-old drone, queen and worker larvae by RNA-Seq. The results from a co-expression network analysis on all expressed genes showed that 2-day-old drone and worker larvae were closer in gene expression profiles than 2-day-old queen larvae...
November 6, 2017: Insect Science
https://www.readbyqxmd.com/read/29104999/spore-load-and-immune-response-of-honey-bees-naturally-infected-by-nosema-ceranae
#19
Wenfeng Li, Jay D Evans, Jianghong Li, Songkun Su, Michele Hamilton, Yanping Chen
Nosema ceranae causes widespread infection in adult workers of European honey bees, Apis mellifera, and has often been linked to honey bee colony losses worldwide. Previous investigations of honey bee immune response to N. ceranae infection were largely based on laboratory experiment, however, little is known about the immune response of honey bees that are naturally infected by N. ceranae. Here, we compared the infection levels of N. ceranae in three different categories of adult bees (emergent bees, nurses, and foragers) and detected the host immune response to the N...
November 6, 2017: Parasitology Research
https://www.readbyqxmd.com/read/29075478/unsuccessful-introduced-biocontrol-agents-can-act-as-pollinators-of-invasive-weeds-bitou-bush-chrysanthemoides-monilifera-ssp-rotundata-as-an-example
#20
Caroline L Gross, Joshua D Whitehead, Camila Silveira de Souza, David Mackay
The extent of self-compatibility and reliance on pollinators for seed set are critical determinants of reproductive success in invasive plant species. Seed herbivores are commonly used as biocontrol agents but may also act as flower visitors, potentially resulting in pollination. However, such contrasting or potentially counterproductive interaction effects are rarely considered or evaluated for biological control programs. We investigated the breeding system and pollinators of Bitou Bush (Chrysanthemoides monilifera ssp...
October 2017: Ecology and Evolution
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