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562 results for “Bumblebee”
FIGURE 7 in Updated list of bumblebees (Hymenoptera: Apidae) from the Spanish Pyrenees with notes on their decline and conservation status
FIGURE 7. Distribution (in meters) range of the bumblebee species and subspecies observed in contemporary samplings (grey rectangles) in the Pyrenees compared with the known altitude distribution (black bars) from historical data.
FIGURE 2 in Updated list of bumblebees (Hymenoptera: Apidae) from the Spanish Pyrenees with notes on their decline and conservation status
FIGURE 2. Map showing historical locations (●) and recent records (*) of Bombus cullumanus cullumanus.
FIGURE 1 in Updated list of bumblebees (Hymenoptera: Apidae) from the Spanish Pyrenees with notes on their decline and conservation status
FIGURE 1. Map of the Spanish Pyrenees indicating the locations visited during the contemporary samplings where bumblebees were collected. Numbers refer to those in Table 1.
FIGURE 3 in Updated list of bumblebees (Hymenoptera: Apidae) from the Spanish Pyrenees with notes on their decline and conservation status
FIGURE 3. Map showing historical locations (●) and recent records (*) of Bombus mendax latofasciatus.
FIGURE 8. a in Updated list of bumblebees (Hymenoptera: Apidae) from the Spanish Pyrenees with notes on their decline and conservation status
FIGURE 8. a) Alpine grassland in Spanish Pyrenees (Lleida, Baños de Tredós, 1743 m.); b) Pyrenean coniferous forest of Pinus uncinata (National Park Aigüestortes and St. Maurici lake, 2035 m.). Photos by C. Ornosa.
Raw data of bumblebee bibliometric research from 1999 to 2024.
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Mating stimulates the immune response and sperm storage-related genes expression in spermathecae of bumblebee (Bombus terrestris) queen
<p>Data of the genes expression in spermathecae of mated bumblebee (<em>Bombus terrestris</em>) queen</p>
Impact of landscape fragmentation and climate change on body size variation of bumblebees during the last century
<p>Body size is a key parameter of organism fitness. While the impact of climate change on body size has received increasing attention, the long-term consequences of landscape fragmentation are still poorly known. These two major global threats may potentially induce opposite trends: the decrease of body size in warmer environments (e.g. individuals developing faster) or the selection of larger individuals in fragmented habitats (e.g. large individuals more capable of reaching distant patches). We assessed the relationship between temperature and landscape fragmentation with mean body size during the last century, within four European regions (Austria, Belgium, England and above the Arctic circle in Scandinavia) and among queens of five bumblebee species. At the regional scale, we first analysed the variation over time of body size and the two hypothesised drivers, temperature and landscape fragmentation. Then, at the local landscape scale, we tested whether body size varied according to these drivers irrespective of the region. At the regional level, we observed a statistically clear increase of queen body size corresponding to an increase of landscape fragmentation (i.e. in Belgium and England). There was no increase of size when fragmentation did not increase (i.e. in Austria and above the Arctic Circle). Temperature also increased through time in all regions. At the local landscape scale, we found that all species were impacted by changes in both climate and landscape fragmentation but show different trends. The body size of the two largest species significantly increased at landscape level with higher fragmentation while body size of the two smallest species decreased with higher fragmentation. We highlight that, in a context of global changes, landscape fragmentation can also be a major driver of body size clines. Depending on the dispersal abilities of species, larger species could be positively selected for and overcome landscape fragmentation.</p>
Short-term exposure to heatwave-like temperatures affects learning and memory in bumblebees
<p><span>Global warming has been identified as a key driver of bee declines around the world. While it is clear that elevated temperatures during the spring and summer months – the principal activity period of many bee species – is a factor in this decline, exactly how temperature affects bee survival is unknown. In vertebrates, there is clear evidence that elevated ambient temperatures impair cognition but whether and how heat affects the cognitive abilities of invertebrates remains unclear. Cognitive skills in bees are essential for their survival as, to supply the hive with nutrition, workers must be able to learn and remember the location of the most rewarding floral resources. Here, we investigate whether </span><span>temperature-related cognitive impairments could be a driver of bee declines by exploring the effect of short-term increases in ambient temperature on learning and memory. We found that, in comparison to bees that were tested at 25°C (a temperature that they would typically experience in summer), bees that were exposed to 32°C (a temperature that they will becoming increasingly exposed to during heatwave events) were significantly worse at forming an association between a coloured light and a sucrose reward and that their capacity to remember this association after just 1 hour was abolished. </span><span>This study provides novel experimental evidence that even just a few hours of exposure to heatwave-like temperatures can severely impair the cognitive performance of insects. Such temperature-induced cognitive deficits could play an important role in explaining recent and future bee population declines.</span></p>
Exposure to elevated temperature during development affects bumblebee foraging behavior
<p><span>Bee foraging behavior provides a pollination service that has both ecological and economic benefits. However, bee population decline could directly affect the efficiency of this interaction. Among the drivers of this decline, global warming has been implicated as an emerging threat but exactly how increasing temperatures affect bee foraging behavior remains unexplored. Here, we assessed how exposure to elevated temperatures during development affects the foraging behavior and morphology of workers from commercial and wild <em>Bombus terrestris</em> colonies. Workers reared at 33°C had a higher visiting rate and shorter visiting time than those reared at 27°C. In addition, far fewer workers reared at 33°C engaged in foraging activities and this is potentially related to the drastic reduction in the number of individuals produced in colonies exposed to 33°C. The impact of elevated developmental temperature on wild colonies was even stronger as none of the workers from these colonies performed any foraging trips. We also found that rearing temperature affected wing size and shape. Our results provide the first evidence that colony temperature can have striking effects on bumblebee foraging behavior. Of particular importance is the drastic reduction in the number of workers performing foraging trips, and the total number of foraging trips made by workers reared in high temperatures. Further studies should explore if, ultimately, these observed effects of exposure to elevated temperature during development lead to a reduction in pollination efficiency.</span></p>
Figure 3 in Discovering endemic species among the bumblebees of Taiwan (Apidae, genus Bombus)
Figure 3. Map of species richness for the bumblebee species widespread between Taiwan and the mainland (from Table 3) among equal-area grid cells. Numbers of species are written in black. The grid is based on longitudinal intervals of 10°, which are used to calculate graduated latitudinal intervals to provide equal-area cells (each cell has an area of approximately 611,000 km2). The colour scale (right) has equal-frequency richness classes, with the maximum in a separate class. The map is a cylindrical orthomorphic equal-area projection (excluding Antarctica) with north at the top.
Figure 1 in Discovering endemic species among the bumblebees of Taiwan (Apidae, genus Bombus)
Figure 1. Left lateral view of the holotype female (queen) of Bombus taiwanensis sp. nov. showing habitus.
Figure 4 in Discovering endemic species among the bumblebees of Taiwan (Apidae, genus Bombus)
Figure 4. Map of species richness for the bumblebee species endemic to Taiwan and their closest relatives on the mainland (from Table 3) among equal-area grid cells. Numbers of species are written in black. The grid is based on longitudinal intervals of 10°, which are used to calculate graduated latitudinal intervals to provide equal-area cells (each cell has an area of approximately 611,000 km2). The colour scale (right) has equal-frequency richness classes, with the maximum in a separate class. The map is a cylindrical orthomorphic equal-area projection (excluding Antarctica) with north at the top.
Figure 2 in Discovering endemic species among the bumblebees of Taiwan (Apidae, genus Bombus)
Figure 2. Anterior view of the lower part of the head of the holotype female (queen) of Bombus taiwanensis sp. nov. showing (centre) the clypeal punctures.
Figure 1. A‒D in Novel splitting/lumping index reflects the history of species concepts applied to bumblebees (Insecta: Apidae)
Figure 1. A‒D: (y axis) species discovery as the cumulative numbers of presently recognized species (SP) described (red squares) and cumulative total numbers of all taxa described (blue diamonds, excluding re-descriptions, replacement names, and infrasubspecific taxa) plotted against (x axis) the dates of the species lists. E‒H: (y axis) the splitting/lumping index SA/SP with red squares for the ratio representing net splitting (SA/SP> 1) or net lumping (SA/SP <1) of presently recognized species calculated as the numbers of species-rank taxa reported by the authors of the species lists (SA), divided by the number of presently recognized species examined by those authors (SP) (the blue line showing the balance point at SA/SP = 1.0), and plotted against the dates of the species lists (x axis). A, E: subgenus Mendacibombus (data from Table 1). B, F: subgenus Alpinobombus (data from Table 2). C, G: subgenus Bombus s.s. (data from Table 3). D, H: subgenus Melanobombus (data from Table 4).
Data from: Field-realistic exposure to the novel insecticide flupyradifurone reduces reproductive output in a bumblebee (Bombus impatiens)
<p>Novel insecticides are continuously being developed for application in response to increased legal restriction of previously developed insecticides and resistance in target insects. These novel insecticides, such as flupyradifurone (FPF), remain relatively untested on non-target organisms, including bumblebees. Further, existing tests on honeybees tend to focus on adult mortality, and thus sub-lethal effects, such as impacts on reproductive output, are neglected, despite their importance for population-level impacts. To address if the novel insecticide FPF has sub-lethal effects on bumblebee reproduction and behavior, we established microcolonies and chronically exposed them to field-realistic concentrations over a 14-day period. We found that exposure to FPF reduced the bumblebees' reproductive output in terms of the number of larvae produced and the mean mass of each larval instar. FPF-treated bees also stored less sucrose and constructed fewer honeypots. However, adult bumblebee mortality was similar between control and FPF-exposed microcolonies. Our results show that field-realistic FPF exposure leads to increased larval mortality and/or delayed larval development, as well as reduced nectar storage, without affecting adult mortality. Policy implications: Insecticides that impair bumblebee reproduction can have long-term population-level consequences, even if adult bees do not experience increased mortality. Despite this fact, sub-lethal effects, such as impacts on reproduction, are not mandatorily assessed within the regulatory process. Our findings highlight the importance of determining sub-lethal effects of pesticides across developmental stages, as well as using pollinator species other than honeybees within the regulatory process.</p>
Crop rotation and agri-environment schemes determine bumblebee communities via flower resources
<p>The biodiversity (flower cover and bumblebees) and environmental data used in the analyses.</p>
FIGURE 12 in Cryptic species among bumblebee mimics: an unrecognized Hemaris hawkmoth (Lepidoptera: Sphingidae) in eastern North America
FIGURE 12. Female genitalia of Hemaris thetis (A), H. diffinis (B) and H. aethra (C). Scale bar equals 1 mm.
FIGURE 11 in Cryptic species among bumblebee mimics: an unrecognized Hemaris hawkmoth (Lepidoptera: Sphingidae) in eastern North America
FIGURE 11. Illustration (top) from the original description of Macroglossa aethra (Strecker 1875), and the holotype specimen with associated labels (bottom), deposited in the Field Museum of Natural history (available at http://collections- Zoology.fieldmuseum.org/catalogue/804170).
FIGURE 10 in Cryptic species among bumblebee mimics: an unrecognized Hemaris hawkmoth (Lepidoptera: Sphingidae) in eastern North America
FIGURE 10. Comparison of the minimum range of H. aethra (red) and the distribution of its larval host plant, Diervilla lonicera (blue). Range of H. aethra is based on minimum shape incorporating examined specimens (Fig. 8), with unverified or potential records indicated by questions marks. Range of D. lonciera is based on information in KartesZ (2015) and Canadensys Explorer (http://data2.canadensys.net).
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Allen Brain Atlas
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International Brain Laboratory public data
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