Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 41 for “"Honeybees"”.
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Are droneflies batesian mimics of honeybees?
… thesis explores the presumed Batesian mimicry of honeybees (Apis mellifera) (Hymenoptera:Apidae) by droneflies (Eristalis species) (Diptera:Syrphidae). Because droneflies do not show particularly close morphological similarity to honeybees, apart possibly in their size, the work has mainly …
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The effects of individual-level differences in metabolic rate on foraging behavior and life history traits in honeybees
… returns. Many central place foragers such as honeybees maximize their energetic efficiency rather than the rate of energetic gain, given the critical role of energetic costs on foraging decisions. We therefore tested if individuals with low or high metabolic rates differ in efficiency …
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Exposure of honeybees (Apis mellifera L.) and other hymenoptera pollinators to different Bacillus thuringiensis based biopesticides in laboratory controlled trials
Gli Apoidei giocano un ruolo fondamentale e strategico nella regolazione dei processi riproduttivi di molte piante, comprese quelle di interesse agrario, grazie alla loro attività di impollinazione. Tra gli Apoidei, presenti in Italia, importanti dal punto di vista agro-economico troviamo: Apis …
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Decision-making in a changing environment : a look at the foraging behavior of honeybees and bumblebees as they respond to shifts in resource availability
Thesis (Ph. D.)--Michigan State University. Department of Zoology, Ecology, Evolutionary Biology, and Behavior, 2010
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Plant-flower visitor interactions in the Sacred Valley of Peru
… Using ordination analysis, hummingbirds, honeybees, flies and beetles were identified as major functional groups of flower visitors with significantly different visitation profiles. Nestedness analysis revealed that the plant-flower visitor networks had a similar structure to other …
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Uncovering Markers for Honey Production and Defensive Behaviour Using Pooled Genome-Wide Data with the Honeybee (Apis Mellifera)
… Honey production and defensive behaviour are honeybees two notable and economically valuable traits. Here we perform a genome-wide association study on 925 honeybee colonies from across Canada to elucidate the genetics of these two traits. We find that 168 SNPs for honey production and 41 SNPs …
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Multiscale dynamics in honeybee societies
… data, I reconstruct the gut microbiomes of honeybees of different castes. I find that the microbiomes of two previously-uncharacterized social castes -- drones and queens -- contain the same bacteria as those in the guts of worker bees. However, despite this similarity, I show that the …
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Evolution of the pheromone communication system in the European Beewolf Philanthus triangulum F. (Hymenoptera: Crabronidae)
… Beewolf females are specialized hunters of honeybees and provision their progeny with paralyzed prey. Male beewolves establish and scent mark territories with a pheromone from a head gland to court females. The concordant occurrence of the otherwise rare alcohol (Z)-11-eicosen-1-ol in the …
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Communication in the hymenoptera : chemistry, ecology and evolution
… were conducted with one digger wasp species, honeybees, one chrysidid wasp, and three ant species. Senders might benefit by exploiting existing preferences of receivers. Such sensory exploitation might influence the evolution of male signals that are designed to attract females. The sex …
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Toward a Holobiont Urbanism : microbial sampling scalability through Apis mellifera
… biological material from cities by using honeybees (Apis mellifera) as a proxy to swab-based sampling methods.
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Modelling the Effects of Stressors and Treatment in a Honeybee Colony
Honeybees are agriculturally important through their pollination work and production of honey. They are also vulnerable to the accumulation of stressors, which cause drastic colony losses. It is important to understand the effect of stress on a hive so that the cost of testing, treatment, and rest …
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Evaluating metabolic rate, survival, feeding behavior and energetic demand in two genotypes of Apis mellifera
… performance in nature. In social insects like honeybees, variation in metabolic rate and energy intake can influence individual performance, leading to colony-level outcomes. However, metabolic processes can be influenced by both genotype and resource availability, but the relative …
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Inter-individual variation within social groups: how metabolic rate shapes the pace of life
… units shapes collective outputs. Using honeybees as a model, we measured a large number of behavioral, physiological, and life-history traits in individual bees and used a path analysis to demonstrate that variation in metabolic rate plays a fundamental proximate role in driving the …
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Spectral and ocellar inputs to honeybee motion-sensitive descending neurons
… identified physiologically and anatomically. In honeybees Kaiser (1975) established that the spectral sensitivity of optomotor responses in bees almost exactly matched that of the green photoreceptors, suggesting an exclusive input from green photoreceptors. However, physiological studies showed …
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Spectral and ocellar inputs to honeybee motion-sensitive descending neurons
… identified physiologically and anatomically. In honeybees Kaiser (1975) established that the spectral sensitivity of optomotor responses in bees almost exactly matched that of the green photoreceptors, suggesting an exclusive input from green photoreceptors. However, physiological studies showed …
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A GIS-Based Landscape Scale Model for Native Bee Habitat
… and yield. Recently, there have been declines in honeybees worldwide. This decline is concerning because it threatens food supplies and global biodiversity. An alternative to alleviating the effect of a honey bee shortage could be to use native bees. Problems with adoption of native bees in …
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Chemical Spin Patterning in Metal-Organic Frameworks
… regulators, such as the production of honey by honeybees. These phenomena occur when individual components of a system interact, generating new collective behaviors. In magnets, interactions between electron spins result in emergent properties with profound fundamental and technological …
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
European honeybees (Apis mellifera) are abundant and effective natural pollinators contributing enormously to mass production of agricultural crops through extensive foraging. They possess visual systems that are highly sensitive to motion and rely on motion of visual elements (optic flow) to …
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Wasps (Hymenoptera: Chalcidoidea) associated with galls in seed-capsules of Eucalyptus camaldulensis (Myrtaceae) in South Africa : species composition, trophic relationships and effects
… source of nectar and pollen to sustain the honeybees which are crucial for pollinating the economically important fruit crops in mainly the Western Cape Province. Despite its utility value, it is regarded as invasive in South Africa, the major concern being the large amounts of water it …
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Tracking Floral Visitation Using DNA Barcodes
… for tracking floral visitation, I collected 89 honeybees (Apis mellifera) and 49 bumblebees (Bombus spp.) from a disturbed forest edge in Columbus, Georgia and analyzed their pollen loads using the plastid DNA barcode region rbcL. The identities of monospecific pollen loads were determined by …
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