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 119 for “"Honey bees"”.
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HONEY BEES, BIODIVERSITY AND CLIMATE CHANGE
Honey bees (Apis mellifera) are vital pollinators for both natural ecosystems and agricultural productivity. However, their populations are threatened by factors such as habitat loss, pathogens, climate change, and the genetic risks associated with selective breeding. This thesis explores the …
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Engineering the gut microbiome of honey bees
Honey bees are critically important commercial pollinators and model systems for insect physiology and behavior. Honey bees are also suffering dramatic declines worldwide due to many factors, including agricultural practices, parasites, and pesticide use. These bees house a simple, conserved gut …
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Molecular bases of scouting behavior in honey bees
Division of labor among honey bee foragers involves “scouts” and “recruits.” Scouts seek new food sources or nest sites independently and recruit other bees in the hive to the locations of good food or nest sites instead of exploiting the resources themselves. In this dissertation, I hypothesize …
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The Effects of Allatecomy on Flight in Honey Bees
Bees were assayed in the lab for flight and metabolic capacity. The CA- group had significantly fewer flightworthy bees and significantly lower metabolic capacity than control groups. MCA- bees were intermediate and not significantly different than the CA- or control groups. These results are …
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Genetic Variation and Differentiation in Honey Bees (Apis) (Electrophoresis)
… World populations of A. mellifera, the familiar honey bee of commerce, are descended from importations that began with early European colonization in the Americas. In the Old World, at least two dozen geographical races of A. mellifera are known to occur. Historical records of introduction …
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Potential for probiotics to mitigate environmental stress in Western honey bees
… larvae. Lactobacilli are part of the honey bee hindgut microbiota, and some probiotic strains have been shown to enhance host immunity and buffer against pathogens. In addition, certain Lactobacillus strains can inhibit P. larvae growth, potentially preventing outbreaks. There is also …
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Time-Memory Behavior Yields Energetically Optimal Foraging Strategy in Honey Bees.
<p>Classical experiments on honey bee time-memory showed that foragers trained to collect food at a fixed time of day return the following day with a remarkable degree of time-accuracy. A series of field experiments revealed that not all foragers return to a food source on unrewarded test days. …
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Genetic and Hormonal Regulation of Worker Behavioural Development in Honey Bees
… I performed three experiments with male honey bees (drones) to investigate how mechanisms regulating worker behavioral development may have evolved. I demonstrated common hormonal and genetic mechanisms regulating behavioral development in workers and drones, which suggests that these …
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Spatiotemporal memories in honey bees: microarray analysis of time-trained foragers
Honey bees feed on flowers, many of which produce nectar during certain restricted, but consistent, time windows in the day. Previous research has shown that honey bees have the ability to form distinct spatiotemporal memories that allow them to return repeatedly to different attractive food …
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Ameliorative effects of phytochemical ingestion on viral infection in honey bees
Honey bee viruses, capable of causing a wide variety of detrimental effects, are an important dimension of honey bee health management. To date, there are no effective treatments for viral infection in honey bees and management relies largely on controlling Varroa mites, a honey bee pest capable of …
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Dynamics and Communication Structures of Nectar Foraging in Honey Bees (Apis mellifera)
In this thesis, I examined honey bee nectar foraging with emphasis on the communication system. To document how a honey bee colony adjusts its daily nectar foraging effort, I observed a random sample of individually marked workers during the entire day, and then estimated the number and activity of …
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The Influence of Honey Bees on The Production of Crimson Clover Seed
Made available in DSpace on 2014-12-05T21:33:58Z (GMT). No. of bitstreams: 1 5801684.pdf: 1362345 bytes, checksum: 1e7a6b9eb3db1f2ab2eb8e8321eb37b4 (MD5) Previous issue date: 1958
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Endocrine, transcriptomic and social regulation of division of labor in honey bees
… of the individual and social group by using the honeybee as a model organism. Chapter 1 reviews the extensive literature regarding the contribution of endocrine signaling (including endocrine-mediated transcriptional cascades) to division of labor in the social Hymenoptera. It also presents a …
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The Neurogenomic State Underlying Selfish and Altruistic Aggression in Honey Bees (Apis mellifera)
I studied aggression using the eusocial Western honey bee, Apis mellifera, as it displays aggression in altruistic and selfish contexts, allowing comparisons that improve our understanding regarding the molecular biology and neurogenomics underlying this ecologically important behaviour. Workers …
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cGMP -Dependent Protein Kinase, Behavioral Plasticity, and Foraging in Honey Bees and Fruit Flies
… , and a traditional behavioral model---the honey bee, Apis mellifera. Variation in the for gene results in naturally occurring behavioral polymorphism. Two fly alleles have been identified; rover flies show longer foraging trails and higher PKG activity than sitter flies. In a series of …
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Polyadenylation of ribosomal RNA in response to picornavirus infection in honey bees (Apis mellifera)
… eighteen different picornaviruses can infect honey bees (Apis mellifera). The combination of the virulence of these pathogens as well as their transmissibility through Varroa destructor, an ectoparasitic mite, can cause severe declines in honey bee populations. Polyadenylated (polyA) rRNA has …
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Understanding the role and impact of introduced honey bees in a submontane indigenous forest ecosystem
… of native ecosystems are less easy to discern. Honey bees (Apis mellifera) have a suite of potential impacts, both positive and negative, on native plants and flower visitors in native ecosystems. This research aimed to investigate the impact of managed introductions of Apis mellifera in native …
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Toxicological Analysis of the Neonicotinoid Insecticide Imidacloprid to Honey Bees, Apis mellifera, of Different Colonies
The honey bee, Apis mellifera, provides about $15 billion USD in crop value each year in the U.S. alone in the form of pollination services. Since 2006, commercial beekeepers have reported an average annual overwintering loss of about 28.6% of all managed colonies. There are many factors that are …
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Investigating naturally evolved Varroa destructorresistance in Apis mellifera honey bees : hostbehavioural traits and parasite reproductivebiology
… remains a major threat to Apis mellifera honey bees amidst ongoing colony losses throughout the Northern Hemisphere. While the vast majority of colonies still require artificial treatments to control their mite populations, an increasing number are evolving mite-resistance and are thus …
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Comparative Physiological and Genomic Analyses of Division of Labor in Honey Bees and Paper Wasps
… and reproduction. Next, I describe research with honey bees (Apis mellifera) to determine whether division of labor between workers is related to individual nutritional status. I found that bees performing foraging behavior have half the abdominal lipid stores of hive-workers. Then, I demonstrated …
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