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Showing 1 to 20 of 26 for “"Bumble Bees"”.
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Population ecology and parasitism in bumble bees (Hymenoptera: apidae)
… and between years. Mean longevity of worker bees decreased significantly toward the end of the season. Mean size of emerging worker bees increased significantly with time. The decreased survivorship may be related to the seasonal size increase of the workers, which would result in an …
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Hiding in plain sight: unveiling cryptic diversity and patterns in bumble bees
Bumble bee research has a rich history that spans more than three centuries. The distributions and the vibrant color patterns of nearly all species of bumble bees are well mapped and described. In addition, the natural history, colony structure and social behavior of bumble bees are well documented …
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Bumble Bees (Apidae: Bombus) Through the Ages: Historical Biogeography and the Evolution of Color Diversity
In the final chapter, I add the rare obligate social parasite Bombus inexspectatus to the phylogeny to assess the evolution of social parasitism. B. inexspectatus is not the sister taxon to its host B. ruderarius, but a close relative, and therefore adheres to the loose version of Emery's rule.
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Avian diet and visual perception suggests avian predation selects for color pattern mimicry in bumble bees
… used to explain numerous other mimicry systems. Bumble bees can be found in throughout the temperate parts of the word, as well as the high mountains and polar regions. In any given area, the local bumble bee species tend to share the same color patterns. Statistical confirmation of these trends …
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The effects of structured variation in nectar standing crop on currency choice and optimal foraging by bumble bees
… within- to solely among-plant variation. Captive bumble bees (Bombus impatiens) confronted with an increasing component of among-inflorescence nectar variation departed inflorescences in manners that diverged increasingly from expectations of the Marginal Value Theorem (MVT). Bees apparently …
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Competitive Effects of Honey Bee (Apis melifera) Hives on Morphology and Morphology-Based Abundance of Bumble Bees (Apidae: Bombus) in an Urban Prairie Landscape (City of Red Deer, Alberta)
… there were measurable effects of managed honey bees (Apis melifera) on bumble bee (Bombus) populations in the City of Red Deer, with an intent to aid wild bee conservation in the area as well as decision-making regarding possible legislation of honey bee keeping within the city. A growing body …
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The role of pathogens in the decline of North American bumble bees with a focus on the microsporidium nosema bombi
Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2010-04-20T14:52:15Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Cordes_Nils.doc: 3626496 bytes, checksum: 86797c1b3922ba9db556d864d1fbcf8b (MD5) Cordes_Nils.pdf: 2655395 bytes, checksum: …
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Connecting above- and belowground effects of climate warming on bumble bee health
… One of the most at-risk groups of pollinators is bumble bees (<em>Bombus</em> spp.). Bumble bees are common, widespread, and key pollinators of a wide range of crops and wild plants. Although studies have examined the thermal physiological traits of individual bumble bees to understand how they …
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The role of intensity, temporal synchrony, and biogenic amines for unimodal and multimodal integration during learning and memory of honey bees and bumble bees
… amines in learning and memory tasks of honey bees and bumble bees. The three chapters provide valuable insights into these interconnected concepts and on the mechanisms underlying bee’s behaviour. The first chapter focuses on the dependency of intensity, for the integration of bimodal signals …
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The role of communication in the foraging process of social bees
In the various groups of social bees, different systems of communication about food sources occur. These communication systems are different solutions to a common problem of social insects: efficiently allocating the necessary number of workers first to the task of foraging and second to the most …
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Inferring rare bumble bee species occurrences from nontarget bumble bee assemblages
… and the success of wild plant communities. Bumble bees are some of the most effective pollinators in temperate climates thanks to their cold hardiness, ability to buzz pollinate, and generalist foraging tendencies, but many species are experiencing sharp declines. The endangered rusty …
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Genomic studies of social evolution in bees
The eusocial insects (ants, termites, and some bees and wasps) are paragons of social complexity, with their highly organized societies comprised of primarily sterile workers, headed by one or a few reproductives. Despite a rich body of theoretical, empirical, and natural history research on social …
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Developmental timing of pupation and analysis of color pattern response to thermal stress in Bombus impatiens (Hymenoptera: Apidae)
Bumble bees comprise a genus of approximately 250 species that exhibit high diversity in color pattern phenotypes, colony sizes, and habitats across the globe. Nearly two centuries of research have investigated the biological factors leading to their widespread distribution and ecological …
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PATTERNS OF AMERICAN BUMBLE BEE (BOMBUS PENSYLVANICUS) ABUNDANCE ACROSS RESTORED HABITATS IN EAST TEXAS ECOSYSTEMS
<p>Many bumble bee species (<em>Bombus</em> spp.), are declining, yet drivers of their abundance remain partially understood. In the southeastern United States, historically open habitats have shifted towards closed-canopy conditions via fire suppression, deforestation and afforestation, altering …
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Landscape composition and configuration affect nest founding but not success of bumble bee colonies in agroecosystems in the Lower Mainland of British Columbia, Canada.
… Columbia, I assessed demographic responses of bumble bees to the availability of resources as inferred from landscape structure (i.e., landscape composition and configuration), and examined the spatial scale that best explained responses to the landscape. I used mixed model regression analysis …
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Landscape effects on bumble bee (Hymenoptera: Apidae) colony performance and fitness in New York State
Pollinators such as bumble bees are in decline as a result of many factors, including loss of habitat. Initiatives to improve and restore pollinator habitat have become increasingly popular. However, to most effectively conserve pollinators, we need a better understanding of which habitats are …
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Colony Life History in the Bumble Bee Bombus terrestris: Interactions, Timing and Control.
… thesis, 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 …
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Where roots run deep: fostering youth environmental motivation through livelihoods in rural place-based education
… changes that are occurring to their local bumble bees and plants. Students of two middle school teachers, one in a suburban school (n=56) and one in a rural school (n=42) implemented the module. To measure the effects of environmental motivation conferred by the module, students took pre …
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