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 32 for “"bumblebees"”.
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Sensory Ecology of Foraging in Bumblebees
… been considered. 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 …
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Efficacy of Nest Boxes for Wild Bumblebees as a Supplemental Pollination Strategy in Highbush Blueberry
Commercial highbush blueberry (Vaccinium corymbosum L) growers use managed honey bee (Apis mellifera) colonies as the primary pollination strategy, yet in many respects wild bumblebee species (Bombus spp. L) are better suited. Studies on the use of nest boxes to augment wild bumblebee populations …
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Foraging in a Complex World: From Individual Flight Performance to Collective Behavior in Bumblebees (Bombus Impatiens)
… is key to survival. For social insects such as bumblebees, successful foraging depends on a combination of individual traits (e.g. physiological and biomechanical performance of individual workers) and collective behavioral strategies for regulating food intake at the colony level. Here, I use …
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CMV Infection Affects Bumblebee Pollination Behaviour and Plant Reproductive Success
… mosaic 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 …
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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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Pollination ecology of the simultaneously flowering Impatiens capensis and I. pallida
… of the annual Impatiens capensis and I. pallida, bumblebees visit I. pallida almost exclusively even when the nutritional reward of I. pallida is removed. This phenomenon contradicts certain models proposed for foraging behavior in simultaneously flowering species and those dealing with optimal …
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Perspectives from above: The role of altitude in bumblebee spatial orientation and navigation
… or their home location. Flying insects like bumblebees master these task despite their relatively small brain size. They acquire visual memories of their nest location, well hidden from predators, to return home after their forag- ing trips. With this thesis I contribute to the field of …
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Effects of plant viral pathogens on plant-pollinator relationships
… volatile organic compounds (VOCs) that attracted bumblebees and enhanced pollination of infected plants. To test if this hypothesis is tenable with other viruses and with plants other than tomato, and to determine if pollinators might derive some advantage by visiting flowers of infected plants, I …
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Effects of Cucumber Mosaic Virus on Plant-Pollinator Relationships
… plants to 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 …
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Hard-wired for success? Unravelling genomic signatures in pollinators
Global decline among bumblebees shows strong evidence of phylogenetic structure, with the subgenus Pyrobombus over-represented among stable/range-expanding species. Based on this striking pattern, a hypothesis was drawn up suggesting that Pyrobombus species have acquired advantageous traits that …
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The influence of linear landscape features on pollinator behaviour
… significantly greater inter-patch movement by bumblebees (Bombus spp.) between the connected patches than the isolated patch even after the position of the feature was changed. The isolated patch, in contrast, was not approached from the other two patches. Bumblebees demonstrated high patch …
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THERE IS NO PLANET B(EE): AN INTEGRATED APPROACH TO UNDERSTANDING DRIVERS OF POTENTIAL DECLINES IN BUMBLEBEE COMMUNITIES
… the functioning of most terrestrial ecosystems. Bumblebees (Hymenoptera: Apidae: Bombus) represent important agricultural and urban pollinator species as they are tolerant of the high disturbance rates that characterize agricultural and urban systems. Over the past four decades, declines in the …
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Effects of systemic fungicides on floral attributes, pollination and fruit aroma in strawberries
… floral attributes and 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 …
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Petals, pigments and pollinator preferences
… plastic artificial ‘flowers’ and lab colonies of bumblebees to test bee responses to the limits of observed variation in shape, in terms of recognition and finding speed, and found that more stellated flower outlines result in a small but non-significant decrease in the time it takes bees to find …
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A proteomic and cytological characterisation of the buff-tailed bumblebee (Bombus terrestris) fat body and haemolymph -An immune perspective
… that support and regulate the immune response in bumblebees. Worryingly, pesticide exposure had a significant effect on the FB proteome and its ability to mount an immune response. Overall these results provide novel insights into molecular aspects of bee health and highlight the importance of …
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Tracking Floral Visitation Using DNA Barcodes
… 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 comparing sequences to a local plant …
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Understanding the development, evolution, and function of bullseye pigmentation patterns in Hibiscus trionum
… in plant-pollinator communication. Buff-tailed bumblebees were found to discriminate between, and prefer, artificial flowers with H.trionum-like bullseye patterns to H.richardsonii-like bullseye patterns.
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Petal cell shape and flower-pollinator interaction in Nicotiana
… 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 alone as well as tactile cues alone. This investigation improves our understanding of the molecular …
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