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30 results for “Bombus impatiens”
Impacts of Food Limitation on Resistance of <i>Bombus impatiens</i> (Hymenoptera: Apidae) to the Gut Parasite <i>Crithidiai</i> (Trypanosomatida: Trypansomatidae)
<p>Data and R scripts for Conroy et al. experiment testing effects of nectar and pollen limitation on parasite load and survival of bumble bees (Bombus impatiens) infected with Crithidia</p>
Preventative medicine? Examining prophylactic effects of a sunflower pollen diet in Bombus impatiens
<p>The widespread decline of pollinator populations is of concern for both natural and agricultural ecosystems. Pathogens have been identified as a major contributor to the decline of some bee species, making understanding host-pathogen dynamics a crucial area of research. Sunflower pollen (<em>Helianthus annuus</em>) dramatically and consistently reduces infection by a prevalent gut pathogen, <em>Crithidia bombi</em>, in the common eastern bumble bee (<em>Bombus impatiens</em>), when consumed by bees post-infection, but we do not know if sunflower can confer protection when consumed before exposure. We asked whether feeding bumble bees sunflower pollen diets before pathogen exposure decreases <em>Crithidia</em> infection compared to buckwheat pollen (<em>Fagopyrum esculentum</em>). Buckwheat pollen was used as a comparison since it has a similar protein concentration as sunflower pollen, but results in high <em>Crithidia</em> counts when consumed post-infection. Bumble bees were fed sunflower or buckwheat pollen for seven days, inoculated with <em>Crithidia</em>, and then fed a wildflower pollen control diet for seven more days before assessing infection. We found that consuming a sunflower pollen diet before inoculation did not reduce <em>Crithidia</em> cell counts compared to buckwheat pollen. Further, bumble bee survival and consumption of sucrose solution and pollen did not differ between these diets. The results show no evidence of sunflower pollen providing prophylactic resistance against <em>Crithidia bombi </em>infection, indicating that the timing at which sunflower pollen is consumed relative to exposure has important consequences for infection.</p>
Linked collectors and determiners for: Bombus impatiens Cresson (Hymenoptera: Apidae, Apinae, Bombini) from the Prairies Ecozone in Canada.
Natural history specimen data linked to collectors and determiners held within, "Bombus impatiens Cresson (Hymenoptera: Apidae, Apinae, Bombini) from the Prairies Ecozone in Canada". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/b065a152-9f83-4944-9ea0-545ac0703c35">https://bionomia.net/dataset/b065a152-9f83-4944-9ea0-545ac0703c35</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/b065a152-9f83-4944-9ea0-545ac0703c35">https://gbif.org/dataset/b065a152-9f83-4944-9ea0-545ac0703c35</a>. Formatted as a Frictionless Data package.
Linked collectors and determiners for: First records of the Common Eastern Bumble Bee, Bombus impatiens Cresson (Hymenoptera: Apidae, Apinae, Bombini) from the Prairies Ecozone in Canada.
Natural history specimen data linked to collectors and determiners held within, "First records of the Common Eastern Bumble Bee, Bombus impatiens Cresson (Hymenoptera: Apidae, Apinae, Bombini) from the Prairies Ecozone in Canada". Claims or attributions were made on Bionomia by volunteer Scribes, <a href="https://bionomia.net/dataset/0f127474-67c6-4e4f-8bd6-74de0963e53b">https://bionomia.net/dataset/0f127474-67c6-4e4f-8bd6-74de0963e53b</a> using specimen data from the dataset aggregated by the Global Biodiversity Information Facility, <a href="https://gbif.org/dataset/0f127474-67c6-4e4f-8bd6-74de0963e53b">https://gbif.org/dataset/0f127474-67c6-4e4f-8bd6-74de0963e53b</a>. Formatted as a Frictionless Data package.
FIGURES 30–32 in Developmental Biology among Corbiculate Bees: Bombus impatiens, Including Observations on Its Egg Eclosion
FIGURES 30–32. SEM micrographs of another hatching first instar of Bombus impatiens about halfway out of chorion, anterior end to right. 30. Rear of body showing disruption of chorion along spiracular line. 31. Close-up of destruction of inner layer of chorion along spiracular line identified by rectangle in figure 30. 32. Close-up of thorax and first abdominal segment demonstrating enlarged first thoracic spiracle compared with two following spiracles.
Data from: Commercial Bombus impatiens colonies function as ecological traps for wild queens
<p>1. In response to anthropogenic environmental change, the cues that animals use throughout their lifecycle to optimize fitness may become unreliable, resulting in an ecological trap.</p> <p>2. Here we investigated whether commercial bumble bee (Bombus impatiens) colonies managed for early spring crop pollination act as ecological traps for wild nest-searching Bombus queens by subverting their natural nest usurpation behavior.</p> <p>3. An average of 10 dead wild queens were recovered from each standard colony during the two-week period of the experiment, but colonies with queen excluders were successful in preventing wild queen deaths. The use of queen excluders did not impact colony performance in terms of resident queen survival, colony reproduction, colony weight gain or worker body size.</p> <p>4. Sites where wild nest-searching queens were small had higher rates of failed usurpation, suggesting smaller-sized queens are disproportionately at risk from failed usurpation. Furthermore, sites where commercial colonies without queen excluders were introduced for spring crop pollination had fewer bumble bee visits to a later-blooming crop compared to sites without commercial colonies.</p> <p>5. Synthesis and applications. Our findings reveal a novel mechanism by which commercial colonies can negatively impact wild bumble bee populations and their pollination services. At the same time, we demonstrate a simple and inexpensive risk mitigation tool – a queen excluder – was 100% effective at eliminating this risk without compromising colony performance. Commercial colonies used outdoors during the bumble bee nest-searching period should be fit with queen excluders to prevent negative impacts on wild pollinator communities and their services.</p>
Figure 2 in Bombus impatiens (Hymenoptera: Apidae) display reduced pollen foraging behavior when marked with bee tags vs. paint
Figure 2. Curves showing the cumulative percentage of bees that performed sonication on Solanum lycopersicum L. after being marked with paint vs. bee tags, out of the total number of marked bees recovered by the end of the experiment (n paint = 83; n tag = 94; n missing = 34). The "+" symbols indicate censored data — bees that never were observed collecting pollen after being marked, within the time constraints of the experiment.
Data from: Commercial Bombus impatiens colonies function as ecological traps for wild queens
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Preventative medicine? Examining prophylactic effects of a sunflower pollen diet in Bombus impatiens
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Testing the relative importance of local resources and landscape connectivity on Bombus impatiens (Hymenoptera, Apidae) colonies
Bee populations are decreasing worldwide. The underlying causes are likely determined by factors at different scales. We tested the relative importance of local resources and landscape connectivity on 64 bumblebee (Bombus impatiens) colonies in experimentally isolated and connected habitat fragments. We used colony mass, no. of workers, and no. of gynes to estimate colony performance. Landscape connectivity did not significantly affect colony performance, but local floral resources had a significantly positive effect, especially in isolated fragments. These results suggest that bumblebee colonies encountered sufficient floral resources within the local 1.4 ha habitat fragments to support colony growth, making long-distance foraging trips to neighboring fragments unnecessary. From a conservation perspective, we suggest that efforts to improve colony performance should prioritize boosting local floral resources over manipulation of large-scale landscape features.
Mean body size predicts colony performance in the common eastern bumble bee (Bombus impatiens)
Prior studies suggest that both the mean and variation of worker size predict the performance of bumble bee colonies. The 'variation hypothesis' posits that colony performance increases with variation of worker body size due to more efficient division of labour within colonies. The 'mean size hypothesis' posits that colony performance increases with mean bumble bee size, as each individual’s efficiency tends to increase with body size. The present study tested these non-mutually exclusive hypotheses by establishing 62 Bombus impatiens Cresson (Hymenoptera, Apidae) nest boxes in 32 semi-natural savanna fragments within large-scale experimental landscapes in South Carolina (U.S.A.). Based on measurements of > 24 000 individuals and on colony growth over ca. 7 weeks, our results support the mean size hypothesis, not the variation hypothesis.
Consumption of pollen contaminated with field-realistic concentrations of fungicide cause sub-lethal effects in common eastern bumble bee (Bombus impatiens [Hymenoptera]: [Apidae]) microcolonies
<p>Bumble bees are declining across the globe. Causes of this decline have been attributed to a variety of stressors, including pesticides. Fungicides are a type of pesticide that have been understudied in the context of bumble bee health. As a result, fungicides are often applied to flowering plants without consideration of pollinator exposure. Recent work demonstrates that fungicides have sublethal effects in bumble bees, but little is known about how much fungicide it takes to cause these sublethal effects. To address this gap in the literature, we fed microcolonies of the common eastern bumble bee (<em>Bombus impatiens</em>) pollen contaminated with a range of fungicide concentrations. We chose these concentrations based on the range of fungicide concentrations in pollen and nectar that were reported in the literature. Results revealed that later-stage pupae and newly emerged males are potentially sensitive to fungicide exposure, showing smaller size and reduced fat reserves at intermediate levels of contamination. Compared to the control, intermediated levels of fungicide-contaminated pollen led to increased pupal mortality and delayed male emergence. Contrary to expectations, higher fungicide levels did not exhibit a linear relationship with negative impacts, suggesting nuanced effects. Because body size and emergence timing are important aspects of bumble bee reproductive behavior, results have implications for mating success, potentially disrupting colony development.</p>
Pollen defenses negatively impact foraging and fitness in a generalist bee (Bombus impatiens: Apidae)
<p>Plants may benefit from limiting the community of generalist floral visitors if the species that remain are more effective pollinators and less effective pollenivores. Plants can reduce access to pollen through altered floral cues or morphological structures, but can also reduce consumption through direct pollen defenses. We observed that<i> Eucera (Peponapis) pruinosa</i>, a specialist bee on <i>Cucurbita</i> plants, collected pure loads of pollen while generalist honey bees and bumble bees collected negligible amounts of cucurbit pollen, even though all groups of bees visited these flowers. Cucurbit flowers have no morphological adaptations to limit pollen collection by bees, thus we assessed their potential for physical, nutritional, and chemical pollen traits that might act as defenses to limit pollen loss to generalist pollinators. Bumble bee (<i>Bombus impatiens</i>) microcolonies experienced reduced pollen consumption, mortality, and reproduction as well as increased stress responses when exposed to nutritional and mechanical pollen defenses. These bees also experienced physiological effects of these defenses in the form of hindgut expansion and gut melanization. Chemical defenses alone increased the area of gut melanization in larger bees and induced possible compensatory feeding. Together, these results suggest that generalist bumble bees avoid collecting cucurbit pollen due to the physiological costs of physical and chemical pollen defenses.</p>
Data from: One size does not fit all: caste and sex differences in the response of bumblebees (Bombus impatiens) to chronic oral neonicotinoid exposure
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Pollen defenses negatively impact foraging and fitness in a generalist bee (Bombus impatiens: Apidae)
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Common herbicide impairs fertility but not survival in bumblebees, <em>Bombus impatiens</em>
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Data from: Bombus impatiens colony microsatellite genotype data for mating frequency analysis
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Consumption of pollen contaminated with field-realistic concentrations of fungicide cause sub-lethal effects in common eastern bumble bee (Bombus impatiens [Hymenoptera]: [Apidae]) microcolonies
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Development of a test design for a semi-field, colony feeding study for the common eastern bumble bee (Bombus impatiens [Hymenoptera:Apidae])
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No evidence for neonicotinoid preferences in the bumblebee Bombus impatiens
<p>Neonicotinoid pesticides can have a multitude of negative sub-lethal effects on bees. Understanding their impact on wild populations requires accurately estimating the dosages bees encounter under natural conditions. This is complicated by the possibility that bees might influence their own exposure: two recent studies found that bumblebees (<i>Bombus terrestris</i>) preferentially consumed neonicotinoid-contaminated nectar, even though these chemicals are thought to be tasteless and odourless. Here we used <i>Bombus impatien</i>s to explore two elements of these reported preferences, with the aim of understanding their ecological implication and underlying mechanism. First, we asked whether preferences persisted across a range of realistic nectar sugar concentrations, when measured at a series of time points up until 24 hours. Second, we tested whether bees' neonicotinoid preferences were driven by an ability to associate their post-ingestive consequences with floral stimuli such as color, location, or scent. We found no evidence that foragers preferred to consume neonicotinoid-containing solutions, despite finding effects on feeding motivation and locomotor activity in line with previous work. Bees also did not preferentially visit floral stimuli previously paired with a neonicotinoid-containing solution. These results highlight the need for further research into the mechanisms underlying bees' responses to these pesticides, critical for determining how neonicotinoid-driven foraging preferences might operate in the real world for different bee species.</p>
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