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https://www.readbyqxmd.com/read/28931157/is-nocturnal-foraging-in-a-tropical-bee-an-escape-from-interference-competition
#1
Adam R Smith, Shannon M Kitchen, Ryan M Toney, Christian Ziegler
Temporal niche partitioning may result from interference competition if animals shift their activity patterns to avoid aggressive competitors. If doing so also shifts food sources, it is difficult to distinguish the effects of interference and consumptive competition in selecting for temporal niche shift. Bees compete for pollen and nectar from flowers through both interference and consumptive competition, and some species of bees have evolved nocturnality. Here, we use tropical forest canopy towers to observe bees (the night-flying sweat bees Megalopta genalis and M...
January 1, 2017: Journal of Insect Science
https://www.readbyqxmd.com/read/28930157/getting-more-power-from-your-flowers-multi-functional-flower-strips-enhance-pollinators-and-pest-control-agents-in-apple-orchards
#2
Alistair John Campbell, Andrew Wilby, Peter Sutton, Felix Wäckers
Flower strips are commonly recommended to boost biodiversity and multiple ecosystem services (e.g., pollination and pest control) on farmland. However, significant knowledge gaps remain regards the extent to which they deliver on these aims. Here, we tested the efficacy of flower strips that targeted different subsets of beneficial arthropods (pollinators and natural enemies) and their ecosystem services in cider apple orchards. Treatments included mixes that specifically targeted: (1) pollinators ('concealed-nectar plants'); (2) natural enemies ('open-nectar plants'); or (3) both groups concurrently (i...
September 20, 2017: Insects
https://www.readbyqxmd.com/read/28904775/how-shrub-encroachment-under-climate-change-could-threaten-pollination-services-for-alpine-wildflowers-a-case-study-using-the-alpine-skypilot-polemonium-viscosum
#3
Jessica A Kettenbach, Nicole Miller-Struttmann, Zoë Moffett, Candace Galen
Under climate change, shrubs encroaching into high altitude plant communities disrupt ecosystem processes. Yet effects of encroachment on pollination mutualisms are poorly understood. Here, we probe potential fitness impacts of interference from encroaching Salix (willows) on pollination quality of the alpine skypilot, Polemonium viscosum. Overlap in flowering time of Salix and Polemonium is a precondition for interference and was surveyed in four extant and 25 historic contact zones. Pollinator sharing was ascertained from observations of willow pollen on bumble bees visiting Polemonium flowers and on Polemonium pistils...
September 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28890769/pollen-load-and-flower-constancy-of-three-species-of-stingless-bees-hymenoptera-apidae-meliponinae
#4
Norita Widya Pangestika, Tri Atmowidi, Sih Kahono
The genera of stingless bees play an important role as pollinators of plants. These bees are actively involved in the pollination of agricultural crops and known to have preferences in selecting flowers to pollinate. The aims of this study were to analyse the pollen load and flower constancy in Tetragonula laeviceps, Lepidotrigona terminata, and Heterotrigona itama. Each individual of species stingless bees collected and was put in a 1.5 mL micro-tube contain 0.5 mL 70% ethanol:glycerol (4:1). Pollen loads on each individual of stingless bees was counted by hemocytometer...
July 2017: Tropical Life Sciences Research
https://www.readbyqxmd.com/read/28889361/brevibacillus-laterosporus-isolated-from-the-digestive-tract-of-honeybees-has-high-antimicrobial-activity-and-promotes-growth-and-productivity-of-honeybee-s-colonies
#5
Jamal M Khaled, Fahd A Al-Mekhlafi, Ramzi A Mothana, Naiyf S Alharbi, Khalid E Alzaharni, Anwar H Sharafaddin, Shine Kadaikunnan, Ahmed S Alobaidi, Noofal I Bayaqoob, Marimuthu Govindarajan, Giovanni Benelli
The development of novel antimicrobial drugs, as well as the discovery of novel compounds able to promote honeybee's growth, represents major challenges for modern entomology. The main aim of this study was to investigate whether Brevibacillus laterosporus isolated from the digestive tract of Saudi honeybees, Apis mellifera, was able to stimulate colony strength parameters of honeybees and to evaluate its ability to produce antimicrobial agents. Honeybees were collected in Dirab, Riyadh Region, Saudi Arabia, and microorganisms were isolated and identified by 16S ribosomal RNA analysis...
September 9, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28887455/neonicotinoids-act-like-endocrine-disrupting-chemicals-in-newly-emerged-bees-and-winter-bees
#6
Danica Baines, Emily Wilton, Abbe Pawluk, Michael de Gorter, Nora Chomistek
Accumulating evidence suggests that neonicotinoids may have long-term adverse effects on bee health, yet our understanding of how this could occur is incomplete. Pesticides can act as endocrine disrupting chemicals (EDCs) in animals providing characteristic multiphasic dose-response curves and non-lethal endpoints in toxicity studies. However, it is not known if neonicotinoids act as EDCs in bees. To address this issue, we performed oral acute and chronic toxicity studies including concentrations recorded in nectar and pollen, applying acetamiprid, clothianidin, imidacloprid, and thiamethoxam to bumble bees, honey bees and leafcutter bees, the three most common bee species managed for pollination...
September 8, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28879772/brain-membrane-proteome-and-phosphoproteome-reveal-molecular-basis-associating-with-nursing-and-foraging-behaviors-of-honeybee-workers
#7
Bin Han, Yu Fang, Mao Feng, Han Hu, Yue Hao, Chuan Ma, Xinmei Huo, Lifeng Meng, Xufeng Zhang, Fan Wu, Jianke Li
The brain is a vital organ in regulating complex social behaviors of honeybees including learning and memory. Knowledge of how brain membrane proteins and their phosphorylation underlie the age-related behavioral polyethism is still lacking. A hitherto age-resolved brain membrane proteome and phosphoproteome were reported in adult worker bees from two strains of honeybee (Apis mellifera ligustica): Italian bee (ITB) and Royal Jelly bee (RJB), a line selected from ITB for increased RJ outputs over 4 decades...
September 7, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28877178/to-be-on-the-safe-site-ungroomed-spots-on-the-bee-s-body-and-their-importance-for-pollination
#8
Laura Koch, Klaus Lunau, Petra Wester
Flower-visiting bees collect large quantities of pollen to feed their offspring. Pollen deposited in the bees' transport organs is lost for the flowers' pollination. It has been hypothesised that specific body areas, bees cannot groom, serve as 'safe sites' for pollen transfer between flowers. For the first time, we experimentally demonstrated the position, area and pollen amount of safe sites at the examples of Apis mellifera and Bombus terrestris by combining artificial contamination of the bees' body with pine or sunflower pollen and the subsequent bees' incomplete grooming...
2017: PloS One
https://www.readbyqxmd.com/read/28854210/honey-bee-foraging-ecology-season-but-not-landscape-diversity-shapes-the-amount-and-diversity-of-collected-pollen
#9
Nadja Danner, Alexander Keller, Stephan Härtel, Ingolf Steffan-Dewenter
The availability of pollen in agricultural landscapes is essential for the successful growth and reproduction of honey bee colonies (Apis mellifera L.). The quantity and diversity of collected pollen can influence the growth and health of honey bee colonies, but little is known about the influence of landscape structure on pollen diet. In a field experiment, we rotated 16 honey bee colonies across 16 agricultural landscapes, used traps to collect samples of collected pollen and observed intra-colonial dance communication to gain information about foraging distances...
2017: PloS One
https://www.readbyqxmd.com/read/28851545/extraction-and-determination-of-bioactive-compounds-from-bee-pollen
#10
REVIEW
Ana M Ares, Silvia Valverde, José L Bernal, María J Nozal, José Bernal
Since ancient times bee pollen has been considered a good source of bioactive substances and energy. Taking into account the current demand for healthy and natural foods, it is not surprising that bee pollen has been attracting commercial interest in recent years, making it one of the most widely consumed food supplements. It has been extensively reported that bee pollen contains several health-promoting compounds, such as proteins, amino acids, lipids, phenolic compounds, vitamins or minerals. Thus, this study aims to give an overview of the extraction and determination techniques of several of the above-mentioned compounds which have been published in the last few years (2011-2017)...
August 8, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28835008/thiamethoxam-and-picoxystrobin-reduce-the-survival-and-overload-the-hepato-nephrocitic-system-of-the-africanized-honeybee
#11
Caio E C Domingues, Fábio Camargo Abdalla, Paulo José Balsamo, Beatriz V R Pereira, Moema de Alencar Hausen, Monica Jones Costa, Elaine C M Silva-Zacarin
Apis mellifera perform important pollination roles in agroecosystems. However, there is often intensive use of systemic pesticides in crops, which can be carried to the colony by forage bees through the collection of contaminated pollen and nectar. Inside the colony, pollen loads are stored by bees that add honey and several enzymes to this pollen. Nevertheless, intra-colonial chronic exposure could induce sublethal effects in young bees exposed to a wide range of pesticides present in these pollen loads. This study was aimed to both determine the survival rate and evaluate the sublethal effects on the hepato-nephrocitic system in response to continuous oral exposure to lower concentrations of neonicotinoid thiamethoxam (TXT) and picoxystrobin fungicide (PXT)...
November 2017: Chemosphere
https://www.readbyqxmd.com/read/28834436/landscape-scale-study-of-the-net-effect-of-proximity-to-a-neonicotinoid-treated-crop-on-bee-colony-health
#12
Nicholas J Balfour, Hasan Al Toufailia, Luciano Scandian, Héloïse E Blanchard, Matthew P Jesse, Norman L Carreck, Francis L W Ratnieks
Since 2013, the European Commission has restricted the use of three neonicotinoid insecticides as seed dressings on bee-attractive crops. Such crops represent an important source of forage for bees, which is often scarce in agro-ecosystems. However, this benefit has often been overlooked in the design of previous field studies, leaving the net impact of neonicotinoid treated crops on bees relatively unknown. Here, we determine the combined benefit (forage) and cost (insecticide) of oilseed rape grown from thiamethoxam-treated seeds on Bombus terrestris and Apis mellifera colonies...
September 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28833462/the-impact-of-pollen-consumption-on-honey-bee-apis-mellifera-digestive-physiology-and-carbohydrate-metabolism
#13
Vincent A Ricigliano, William Fitz, Duan C Copeland, Brendon M Mott, Patrick Maes, Amy S Floyd, Arnold Dockstader, Kirk E Anderson
Carbohydrate-active enzymes play an important role in the honey bee (Apis mellifera) due to its dietary specialization on plant-based nutrition. Secretory glycoside hydrolases (GHs) produced in worker head glands aid in the processing of floral nectar into honey and are expressed in accordance with age-based division of labor. Pollen utilization by the honey bee has been investigated in considerable detail, but little is known about the metabolic fate of indigestible carbohydrates and glycosides in pollen biomass...
August 20, 2017: Archives of Insect Biochemistry and Physiology
https://www.readbyqxmd.com/read/28832668/context-dependent-medicinal-effects-of-anabasine-and-infection-dependent-toxicity-in-bumble-bees
#14
Evan C Palmer-Young, Alison Hogeboom, Alexander J Kaye, Dash Donnelly, Jonathan Andicoechea, Sara June Connon, Ian Weston, Kimberly Skyrm, Rebecca E Irwin, Lynn S Adler
BACKGROUND: Floral phytochemicals are ubiquitous in nature, and can function both as antimicrobials and as insecticides. Although many phytochemicals act as toxins and deterrents to consumers, the same chemicals may counteract disease and be preferred by infected individuals. The roles of nectar and pollen phytochemicals in pollinator ecology and conservation are complex, with evidence for both toxicity and medicinal effects against parasites. However, it remains unclear how consistent the effects of phytochemicals are across different parasite lineages and environmental conditions, and whether pollinators actively self-medicate with these compounds when infected...
2017: PloS One
https://www.readbyqxmd.com/read/28829793/ecological-stoichiometry-of-the-honeybee-pollen-diversity-and-adequate-species-composition-are-needed-to-mitigate-limitations-imposed-on-the-growth-and-development-of-bees-by-pollen-quality
#15
Michał Filipiak, Karolina Kuszewska, Michel Asselman, Bożena Denisow, Ernest Stawiarz, Michał Woyciechowski, January Weiner
The least understood aspects of the nutritional needs of bees are the elemental composition of pollen and the bees' need for a stoichiometrically balanced diet containing the required proportions of nutrients. Reduced plant diversity has been proposed as an indirect factor responsible for the pollinator crisis. We suggest stoichiometric mismatch resulting from a nutritionally unbalanced diet as a potential direct factor. The concentrations and stoichiometric ratios of C, N, S, P, K, Na, Ca, Mg, Fe, Zn, Mn, and Cu were studied in the bodies of honeybees of various castes and sexes and in the nectar and pollen of various plant species...
2017: PloS One
https://www.readbyqxmd.com/read/28827573/pollinator-importance-networks-illustrate-the-crucial-value-of-bees-in-a-highly-speciose-plant-community
#16
Gavin Ballantyne, Katherine C R Baldock, Luke Rendell, P G Willmer
Accurate predictions of pollination service delivery require a comprehensive understanding of the interactions between plants and flower visitors. To improve measurements of pollinator performance underlying such predictions, we surveyed visitation frequency, pollinator effectiveness (pollen deposition ability) and pollinator importance (the product of visitation frequency and effectiveness) of flower visitors in a diverse Mediterranean flower meadow. With these data we constructed the largest pollinator importance network to date and compared it with the corresponding visitation network to estimate the specialisation of the community with greater precision...
August 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28822493/interactions-between-bee-foraging-and-floral-resource-phenology-shape-bee-populations-and-communities
#17
REVIEW
Jane E Ogilvie, Jessica Rk Forrest
Flowers are ephemeral, yet bees rely on them for food throughout their lives. Floral resource phenology - which can be altered by changes in climate and land-use - is therefore key to bee fitness and community composition. Here, we discuss the interactions between floral resource phenology, bee foraging behaviour, and traits such as diet breadth, sociality, and body size. Recent research on bumble bees has examined behavioural responses to local floral turnover and effects of landscape-scale floral resource phenology on fitness, abundance, and foraging distances...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28822490/the-role-of-disease-in-bee-foraging-ecology
#18
REVIEW
Hauke Koch, Mark Jf Brown, Philip C Stevenson
Diseases have important but understudied effects on bee foraging ecology. Bees transmit and contract diseases on flowers, but floral traits including plant volatiles and inflorescence architecture may affect transmission. Diseases spill over from managed or invasive pollinators to native wild bee species, and impacts of emerging diseases are of particular concern, threatening pollinator populations and pollination services. Here we review how parasites can alter the foraging behaviour of bees by changing floral preferences and impairing foraging efficiency...
June 2017: Current Opinion in Insect Science
https://www.readbyqxmd.com/read/28821570/juvenile-hormone-but-not-nutrition-or-social-cues-affects-reproductive-maturation-in-solitary-alkali-bees-nomia-melanderi
#19
Karen M Kapheim, Makenna M Johnson
Eusocial insect colonies are defined by extreme variation in reproductive activity among castes, but the ancestral conditions from which this variation arose are unknown. Investigating the factors that contribute to variation in reproductive physiology among solitary insects that are closely related to social species can help to fill this gap. We experimentally tested the role of nutrition, juvenile hormone, and social cues on reproductive maturation in solitary alkali bees (Halictidae: Nomia melanderi). We find that alkali bee females emerge from overwintering with small Dufour's glands and small ovaries, containing oocytes in the early stages of development...
August 18, 2017: Journal of Experimental Biology
https://www.readbyqxmd.com/read/28808562/floral-scent-and-species-divergence-in-a-pair-of-sexually-deceptive-orchids
#20
Daniel D L Gervasi, Marc-Andre Selosse, Mathieu Sauve, Wittko Francke, Nicolas J Vereecken, Salvatore Cozzolino, Florian P Schiestl
Speciation is typically accompanied by the formation of isolation barriers between lineages. Commonly, reproductive barriers are separated into pre- and post-zygotic mechanisms that can evolve with different speed. In this study, we measured the strength of different reproductive barriers in two closely related, sympatric orchids of the Ophrys insectifera group, namely Ophrys insectifera and Ophrys aymoninii to infer possible mechanisms of speciation. We quantified pre- and post-pollination barriers through observation of pollen flow, by performing artificial inter- and intraspecific crosses and analyzing scent bouquets...
August 2017: Ecology and Evolution
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