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 17 of 17 for “"Bombus terrestris"”.
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Colony Life History in the Bumble Bee Bombus terrestris: Interactions, Timing and Control.
… I use laboratory experiments with the bumble bee Bombus terrestris to investigate the control of eusocial insect colony life history, with a focus on the interactions that bring about control over timing. Specifically, I reveal queen control over the onset of male production; show that colonies do …
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The role of small RNAs in caste determination and differentiation in the bumble bee, Bombus terrestris
… and differentiation in the bumble bee Bombus terrestris. In Chapter 2, I used deep sequencing (miRNA-seq) and bioinformatics to annotate miRNAs in B. terrestris and a second Bombus species, B. impatiens. I found that B. terrestris yielded 131 miRNAs and B. impatiens yielded 114 miRNAs …
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A proteomic and cytological characterisation of the buff-tailed bumblebee (Bombus terrestris) fat body and haemolymph -An immune perspective
… that provide essential ecosystem services. Bombus terrestris (Linnaeus) is a widespread and important bumblebee pollinator of wild and cultivated crops and although found commonly across Europe, is available commercially to supplement pollination requirements. Due to their activity, B. …
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Sensory Ecology of Foraging in Bumblebees
… In the present study I used bumblebees (Bombus terrestris), an important pollinating insect, to investigate possible sensory constraints on foraging behavior. Additionally, I survey inter-individual variation in the sensory capabilities and behavior of bumblebees caused by the pronounced …
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Key role and diversity of EcR/USP and other nuclear receptors in selected Arthropoda species
… pisum, the holometabolic buff-tailed bumblebee Bombus terrestris and the chelicerate two-spotted spidermite Tetranychus urticae as representatives of their respective clades. The main research questions that were addressed in the PhD thesis were: (1) Do holometabolic, hemimetabolic and …
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Petal cell shape and flower-pollinator interaction in Nicotiana
… in the perception of flowers by model pollinator Bombus terrestris using biomimetic artificial flowers. Pollinator behaviour experiments indicate that the bumblebees can discriminate flowers with conical from flowers with non-conical surfaces, on a red and on a white background, using visual cues …
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Quality checking and expression analysis of high-throughput small RNA sequencing data
… in a novel genome; the European bumblebee (Bombus terrestris). Secondly, we explore the di�erential expression during cell stress of all classes of sRNAs using two cell lines in humans. We also �nd that a speci�c protein, Ro60, is required for the expression of mRNA-derived sRNAs during …
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Toxicity assessment of pesticides and biopesticides on wild and managed bees (Hymenoptera, Apoidea), and richness evaluation in mediterranean and tropical agroecosystems
… topical and oral exposure to Apis mellifera, Bombus terrestris, Osmia bicornis, and Melipona mondury. Changes in feeding behavior and locomotor alterations caused by exposure to EOs were observed on the stingless bee M. mondury. Commonly used pesticides and biopesticides caused reduced …
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Genomic studies of social evolution in bees
… in maternal traits in queens of the bumble bee Bombus terrestris are regulated by workers during the nest initiation phase of the Bombus life cycle. Here, I provide evidence that workers socially regulate both brood-feeding and egg-laying behavior in queens, and may also influence patterns of …
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BIOLOGIA FIORALE, PRODUZIONE DI SEME E MIGLIORAMENTO GENETICO DEL CARCIOFO
… spaziale delle piante e sull impiego di Bombus terrestris per la produzione di seme. Infine, è stata messa in evidenza la validità della selezione clonale della popolazione autoctona Spinoso di Palermo , atteso che i cloni selezionati e caratterizzati hanno presentato un ottimo valore …
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Exploring strategies to enhance pollination and yield in the field bean, Vicia faba L.
… field trials, preferences experiments using <i>Bombus terrestris</i> foragers in controlled condition were used to identify <i>V. faba</i> floral traits likely to be most important for bee attraction. Together, field and controlled condition experiments suggested that floral colour, nectar …
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The Characterisation Of Bee Nicotinic Acetylcholine Receptors
… between three species of bees (Apis mellifera, Bombus terrestris and Bombus impatiens) causes a significant change in the efficacious properties of clothianidin, without effecting the pharmacology of the endogenous agonist acetylcholine. In addition species-specific variation in the α1 subunits …
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Grip, slip, petals, and pollinators: Linking the biomechanics, behaviour and ecology of interactions between bees and plants
… between sexes and clades. Using $\textit{Bombus terrestris}$, there was no evidence that cleft claws are important for pollen collection; however, I found that the inner tooth of cleft claws can act as a backup if the main tooth breaks. Although this may be one function of cleft claws, …
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Effects of Cucumber Mosaic Virus on Plant-Pollinator Relationships
… emit volatile chemicals that attract bumblebees (Bombus terrestris). Bumblebees are important tomato pollinators but do not transmit CMV. For wild plants under natural conditions, helping host reproduction by encouraging bee visitation, pollination and increased host reproduction might represent a …
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Effects of plant viral pathogens on plant-pollinator relationships
… virus). Commercially produced bumblebees (Bombus terrestris) and wild bees were studied, respectively, under glasshouse conditions and in the field. My data indicates that viruses can pay back susceptible hosts by attracting pollinators through changes in host-emitted VOCs and rewarding …
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CMV Infection Affects Bumblebee Pollination Behaviour and Plant Reproductive Success
… virus (CMV) were more attractive to bumblebees (Bombus terrestris) in free choice assays. I extended this work using Arabidopsis thaliana mutants with lesions in genes encoding factors in RNA silencing. In conditioning assays, I confirmed that plant VOC emission is controlled in part by the …
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Effects of systemic fungicides on floral attributes, pollination and fruit aroma in strawberries
… the concomitant effect on bumblebees (Apidae: *Bombus terrestris*). Plant-pollinator interactions are highly complex and shaped by various factors, including fungicide treatments. To better understand these interactions, I analysed floral volatiles, pollen weight and pollen protein from …