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https://www.readbyqxmd.com/read/29162843/behavioral-responses-of-honey-bees-apis-mellifera-to-natural-and-synthetic-xenobiotics-in-food
#1
Ling-Hsiu Liao, Wen-Yen Wu, May R Berenbaum
While the natural foods of the western honey bee (Apis mellifera) contain diverse phytochemicals, in contemporary agroecosystems honey bees also encounter pesticides as floral tissue contaminants. Whereas some ubiquitous phytochemicals in bee foods up-regulate detoxification and immunity genes, thereby benefiting nestmates, many agrochemical pesticides adversely affect bee health even at sublethal levels. How honey bees assess xenobiotic risk to nestmates as they forage is poorly understood. Accordingly, we tested nine phytochemicals ubiquitous in nectar, pollen, or propolis, as well as five synthetic xenobiotics that frequently contaminate hives-two herbicides (atrazine and glyphosate) and three fungicides (boscalid, chlorothalonil, and prochloraz)...
November 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29161278/resilience-of-honeybee-colonies-via-common-stomach-a-model-of-self-regulation-of-foraging
#2
Thomas Schmickl, Istvan Karsai
We propose a new regulation mechanism based on the idea of the "common stomach" to explain several aspects of the resilience and homeostatic regulation of honeybee colonies. This mechanism exploits shared pools of substances (pollen, nectar, workers, brood) that modulate recruitment, abandonment and allocation patterns at the colony-level and enable bees to perform several survival strategies to cope with difficult circumstances: Lack of proteins leads to reduced feeding of young brood, to early capping of old brood and to regaining of already spent proteins through brood cannibalism...
2017: PloS One
https://www.readbyqxmd.com/read/29157160/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-4-thiamethoxam
#3
Gladys L Stephenson, Keith R Solomon
A quantitative weight of evidence (QWoE) methodology was used to assess several higher-tier studies on the effects of thiamethoxam (TMX) on honeybees. Assessment endpoints were population size and viability of commercially managed honeybee colonies and quantity of hive products. A higher-tier field toxicology study indicated a no-observed-adverse effect concentration (NOAEC) of 29.5 µg TMX/kg syrup, equivalent to an oral no-observed-adverse-effect-dose (NOAED) of 8.6 ng/bee/day for all responses measured...
November 20, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29144196/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-3-clothianidin
#4
Keith R Solomon, Gladys L Stephenson
A quantitative weight of evidence (QWoE) methodology was used to assess higher tier studies on the effects of clothianidin (CTD) on honeybees. Assessment endpoints were population size and viability of commercially managed bees and quantity of hive products. A colony-level no-observed-adverse effect concentration (NOAEC) of 25 µg CTD/kg syrup, equivalent to an oral no-observed-adverse effect-dose (NOAED) of 7.3 ng/bee/d for all responses measured. Based on a NOAEC of 19.7 µg/kg pollen, the NOAED for honeybee larvae was 2...
November 16, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
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
#5
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/29141708/sensitive-detection-of-neonicotinoid-insecticides-and-other-selected-pesticides-in-pollen-and-nectar-using-nanoflow-liquid-chromatography-orbitrap-tandem-mass-spectrometry
#6
David Moreno-González, Jaime Alcántara-Durán, Bienvenida Gilbert-López, Miriam Beneito-Cambra, Víctor M Cutillas, Łukasz Rajski, Antonio Molina-Díaz, Juan F García-Reyes
In this work, a new method based on nanoflow LC with high-resolution MS was developed for the determination ofeight pesticides in pollen and nectar samples, including neonicotinoid insecticides and other selected pesticides commonly found in bees and beeswax. Detection was undertaken with a hybrid quadrupole-Orbitrap mass spectrometer (Q Exactive™) equipped with a commercial nanospray ion source. The extraction of pesticides from pollen samples was performed by a modified micro-QuEChERS method scaled down to Eppendorf tubes, whereas nectar samples were simply diluted with a water–methanol (95 + 5, v/v) solution...
November 15, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/29141565/radio-modulatory-potential-ofcaffeic-acid-phenethyl-ester-a-therapeutic-perspective
#7
Km Anjaly, Ashu Tiku
Use of natural agents is an upcoming area of research in cancer biology. Caffeic acid phenethyl ester has received great attention because of its therapeutic potential in various conditions including cancer. It is an active/abundant component of propolis. Propolis is a honey bee hive product produced by bees using their enzyme-rich digestive secretions on resinous mix, bee wax and pollen from plants. It is used to protect the beehive against bacteria and other infections.Although a lot of work has been done on chemotherapeutic aspects of CAPE, its role as a radiomodulator is yet to be delineated...
November 13, 2017: Anti-cancer Agents in Medicinal Chemistry
https://www.readbyqxmd.com/read/29140765/quantitative-weight-of-evidence-assessment-of-higher-tier-studies-on-the-toxicity-and-risks-of-neonicotinoids-in-honeybees-2-imidacloprid
#8
Gladys L Stephenson, Keith R Solomon
A quantitative weight of evidence (QWoE) methodology was used to assess higher-tier studies on the effects of imidacloprid (IMI) on honeybees. Assessment endpoints were population size and viability of commercially managed bees and quantity of hive products. A colony-level no-observed-adverse effect concentration (NOAEC) of 25 µg IMI/kg syrup, equivalent to an oral no-observed-adverse-effect-dose of 7.3 ng/bee/d for all responses, was measured. The overall weight of evidence indicates that there is minimal risk to honeybees from exposure to IMI from its use as a seed treatment...
November 15, 2017: Journal of Toxicology and Environmental Health. Part B, Critical Reviews
https://www.readbyqxmd.com/read/29138404/neonicotinoid-pesticide-limits-improvement-in-buzz-pollination-by-bumblebees
#9
P R Whitehorn, C Wallace, M Vallejo-Marin
Neonicotinoid pesticides have been linked to global declines of beneficial insects such as bumblebees. Exposure to trace levels of these chemicals causes sub-lethal effects, such as reduced learning and foraging efficiency. Complex behaviours may be particularly vulnerable to the neurotoxic effects of neonicotinoids. Such behaviours may include buzz pollination (sonication), in which pollinators, usually bees, use innate and learned behaviours to generate high-frequency vibrations to release pollen from flowers with specialised anther morphologies...
November 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29134400/safe-sites-of-pollen-placement-a-conflict-of-interest-between-plants-and-bees
#10
Ze-Yu Tong, Shuang-Quan Huang
Plant stigmas and bee pollinators are competitors for pollen. Pollen placed on a pollinator's body can be picked up by conspecific stigmas or it can be collected by the pollinator as food. Hypothetically, one solution is for pollen to be placed on 'safe sites' on the pollinator's body, sites where the pollinator cannot easily remove it, leaving the pollen for stigmas. We compared 14 sites on the bumblebee body in terms of the ability of the bee to groom off fluorescent power, a dust that may be thought of as analogous to pollen...
November 13, 2017: Oecologia
https://www.readbyqxmd.com/read/29133226/the-effect-of-dietary-neonicotinoid-pesticides-on-non-flight-thermogenesis-in-worker-bumble-bees-bombus-terrestris
#11
Robert Potts, Rebecca M Clarke, Sophie E Oldfield, Lisa K Wood, Natalie Hempel de Ibarra, James E Cresswell
For bumble bees (genus Bombus), the capacity for non-flight thermogenesis is essential for two fundamental processes undertaken by adult workers, namely recovery from torpor after chilling and brood incubation. Farmland bees can be widely exposed to dietary residues of neurotoxic neonicotinoid insecticides that appear in the nectar and pollen of treated bee-attractive crops, which may harm them. An earlier study shows that dietary neonicotinoids cause complex alterations to thermoregulation in honey bees, but their effects on the thermogenic capabilities of individual bumble bees has been untested previously...
November 10, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/29127217/adding-landscape-genetics-and-individual-traits-to-the-ecosystem-function-paradigm-reveals-the-importance-of-species-functional-breadth
#12
Antonio R Castilla, Nathaniel S Pope, Megan O'Connell, María F Rodriguez, Laurel Treviño, Alonso Santos, Shalene Jha
Animal pollination mediates both reproduction and gene flow for the majority of plant species across the globe. However, past functional studies have focused largely on seed production; although useful, this focus on seed set does not provide information regarding species-specific contributions to pollen-mediated gene flow. Here we quantify pollen dispersal for individual pollinator species across more than 690 ha of tropical forest. Specifically, we examine visitation, seed production, and pollen-dispersal ability for the entire pollinator community of a common tropical tree using a series of individual-based pollinator-exclusion experiments followed by molecular-based fractional paternity analyses...
November 10, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29126172/native-honey-bees-outperform-adventive-honey-bees-in-increasing-pyrus-bretschneideri-rosales-rosaceae-pollination
#13
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/29123189/a-common-neonicotinoid-pesticide-thiamethoxam-alters-honey-bee-activity-motor-functions-and-movement-to-light
#14
S Tosi, J C Nieh
Honey bees provide key ecosystem services. To pollinate and to sustain the colony, workers must walk, climb, and use phototaxis as they move inside and outside the nest. Phototaxis, orientation to light, is linked to sucrose responsiveness and the transition of work from inside to outside the nest, and is also a key component of division of labour. However, the sublethal effects of pesticides on locomotion and movement to light are relatively poorly understood. Thiamethoxam (TMX) is a common neonicotinoid pesticide that bees can consume in nectar and pollen...
November 9, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29120069/effects-of-exposure-to-winter-oilseed-rape-grown-from-thiamethoxam-treated-seed-on-the-red-mason-bee-osmia-bicornis
#15
Natalie Ruddle, Charlotte Elston, Olaf Klein, Anja Hamberger, Helen Thompson
There has been increasing interest on the effects of neonicotinoid insecticides on wild bees. In solitary bee species the direct link between each individual female and their reproductive success offers the opportunity to evaluate effects on individuals. The present study investigated effects of exposure to winter oilseed rape grown from thiamethoxam-treated seed on reproductive behaviour and output of solitary red mason bees (Osmia bicornis) released in 6 pairs of fields over a two-year period and confined to tunnels in a single year...
November 9, 2017: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29118416/protein-nutrition-governs-within-host-race-of-honey-bee-pathogens
#16
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/29094423/pollination-context-alters-female-advantage-in-gynodioecious-silene-vulgaris
#17
James D Stone, Matthew S Olson
Gynodioecy, the co-occurrence of females and hermaphrodites, is arguably the most common angiosperm gender polymorphism in many florae. Females' ability to invade and persist among hermaphrodites depends, in part, on pollinators providing adequate pollination to females. We directly measured diurnal and nocturnal pollinators' contributions to female and hermaphrodite seed production in artificial populations of gynodioecious Silene vulgaris by experimentally restricting pollinator access. We found that female relative seed production in this system depended strongly on pollination context: females produced more than twice as many seeds as hermaphrodites in the context of abundant, nectar-collecting moths...
November 1, 2017: Journal of Evolutionary Biology
https://www.readbyqxmd.com/read/29080463/ameliorative-effects-of-bee-pollen-and-date-palm-pollen-on-the-glycemic-state-and-male-sexual-dysfunctions-in-streptozotocin-induced-diabetic-wistar-rats
#18
Nema A Mohamed, Osama M Ahmed, Walaa G Hozayen, Marium A Ahmed
This study aimed to assess the effects of bee pollen (BP) and/or date palm pollen (DPP) suspensions on the glycemic state, testicular dysfunctions, oxidative stress and antioxidant defense system in streptozotocin (STZ)-induced diabetic male Wistar rats. Diabetes mellitus was induced by single intraperitoneal injection of STZ to overnight-fasted rats at dose of 40mg/kg body weight. After 1 week of STZ injection, diabetic rats were treated with BP and/or DPP suspensions at dose levels of 100mg/kg body weight/day for 4 weeks...
October 25, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29077200/validation-of-floral-food-resources-for-pollinators-in-agricultural-landscape-in-se-poland
#19
Jacek Jachuła, Bożena Denisow, Małgorzata Wrzesień
BACKGROUND: Proper management of bee pastures is considered an important activity for diversity of pollinators and conservation of the population size. In the present study, we evaluated the floral composition and diversity, flowering spectrum, and availability of food resources in natural and man-made habitats in four rural municipalities in the Lublin Upland, SE Poland. We also determined the connection between pollinator-friendly biotopes and made some suggestions on creation/supplementation of bee pastures adapted to the arable land structure in eastern Poland (mean acreage 7...
October 27, 2017: Journal of the Science of Food and Agriculture
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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