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60 results for “Bee abundance”
Bee diversity and abundance during peach bloom in South Carolina, United States
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Central Arizona - Phoenix Urban LTER site, station Agricultural study sites at Central Arizona-Phoenix Urban LTER, study of animal abundance of Hymenoptera (ants, bees and wasps) in units of numberPerPitfallTrap on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Central Arizona - Phoenix Urban LTER (CAP) contains animal abundance of Hymenoptera (ants, bees and wasps) measurements in numberPerPitfallTrap units and were aggregated to a yearly timescale.
Central Arizona - Phoenix Urban LTER site, station Desert study sites at Central Arizona-Phoenix Urban LTER, study of animal abundance of Hymenoptera (ants, bees and wasps) in units of numberPerPitfallTrap on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Central Arizona - Phoenix Urban LTER (CAP) contains animal abundance of Hymenoptera (ants, bees and wasps) measurements in numberPerPitfallTrap units and were aggregated to a yearly timescale.
Central Arizona - Phoenix Urban LTER site, station Urban study sites at Central Arizona-Phoenix Urban LTER, study of animal abundance of Hymenoptera (ants, bees and wasps) in units of numberPerPitfallTrap on a yearly timescale
The EcoTrends project was established in 2004 by Dr. Debra Peters (Jornada Basin LTER, USDA-ARS Jornada Experimental Range) and Dr. Ariel Lugo (Luquillo LTER, USDA-FS Luquillo Experimental Forest) to support the collection and analysis of long-term ecological datasets. The project is a large synthesis effort focused on improving the accessibility and use of long-term data. At present, there are ~50 state and federally funded research sites that are participating and contributing to the EcoTrends project, including all 26 Long-Term Ecological Research (LTER) sites and sites funded by the USDA Agriculture Research Service (ARS), USDA Forest Service, US Department of Energy, US Geological Survey (USGS) and numerous universities. Data from the EcoTrends project are available through an exploratory web portal (http://www.ecotrends.info). This web portal enables the continuation of data compilation and accessibility by users through an interactive web application. Ongoing data compilation is updated through both manual and automatic processing as part of the LTER Provenance Aware Synthesis Tracking Architecture (PASTA). The web portal is a collaboration between the Jornada LTER and the LTER Network Office. The following dataset from Central Arizona - Phoenix Urban LTER (CAP) contains animal abundance of Hymenoptera (ants, bees and wasps) measurements in numberPerPitfallTrap units and were aggregated to a yearly timescale.
Data from: Prevalence and abundance of bees visiting major conventionally-managed agricultural crops in Brazil
This study brings together data from a series of local pollinator surveys undertaken in major conventionally-managed agricultural crops in Brazil to determine the presence and abundance of bees visiting flowers within crops compared with adjacent off-crop habitats. Surveys were undertaken within crops and in adjacent off-crop areas using broadly the same methodology in flowering soybean, drybean, maize, citrus, coffee, rice, and cotton and in sugarcane immediately harvest. The bee species present were assessed twice per day at three times during crop flowering (post-harvest for sugar-cane). Pan traps were used to collect species present within the crop and off-crop twice per day. Drybeans, citrus, and coffee flowers displayed a consistent medium to high abundance of honey bees based on effort-adjusted transect and spot counts. In contrast, fields with flowering soybeans and cotton showed in-crop lower abundance and rice, corn, and harvested sugar cane showed consistently low numbers or no honey bees. In almost all cases honey bees were the most prevalent and abundant flower visitors within the studied crops. Where non-Apis bees were observed they often belong to the Meliponini (primarily Trigona) or the genera Bombus or Xylocopa. The off-crop assessments of species presence using pan traps showed a far wider diversity of species with greater proportional representation of solitary bee species. Overall, whilst honey bees accounted for the majority of observed bees visiting flowers in the agricultural fields, the off-crop habitat contained a greater abundance and diversity of non-Apis bee populations.
Heterogeneous agroecosystems support high diversity and abundance of trap nesting bees and wasps amongst tropical crops
<p>Land-use intensification for agricultural purposes modifies the structure of natural environments in various ways and at different spatial scales. These modifications can affect ecological processes and the community structure of multi-environment users such as solitary bees and wasps. Understanding the role of distinct habitat descriptors in promoting such changes is one of the major challenges of empirical studies. In this study, we use a multi-scale approach to evaluate how landscape compositional and configurational heterogeneity, vegetation structural complexity, and the proportion of agricultural landscape composition affect communities of bees and wasps that nest in pre-existing cavities in remnants of native vegetation bordering agroecosystems. We selected 25 sampling points along a gradient of amount of surrounding agriculture and landscape diversity within natural physiognomies located in Chapada Diamantina, Bahia, Brazil. Through model selection using Akaike's information criterion, we verified the complementary roles of landscape heterogeneity and local vegetation in structuring these hymenopteran communities. Abundance in the groups showed different tendencies depending on the descriptors employed, pointing to the importance of evaluating within-group specificity. Furthermore, bees and wasps presented differential responses to landscape composition, but they did not differ in relation to configurational complexity. In more heterogeneous landscapes or sites with more complex local vegetation, the proportion of agriculture had a positive influence on the response evaluated. Efficient management of agricultural landscapes therefore requires increased landscape heterogeneity and conservation or restoration of native vegetation remnants at the local scale.</p>
Bumble bees in landscapes with abundant floral resources have lower pathogen loads
AbstractThe pollination services provided by bees are essential for supporting natural and agricultural ecosystems. However, bee population declines have been documented across the world. Many of the factors known to undermine bee health (e.g., poor nutrition) can decrease immunocompetence and, thereby, increase bees' susceptibility to diseases. Given the myriad of stressors that can exacerbate disease in wild bee populations, assessments of the relative impact of landscape habitat conditions on bee pathogen prevalence are needed to effectively conserve pollinator populations. Herein, we assess how landscape-level conditions, including various metrics of floral/nesting resources, insecticides, weather, and honey bee (Apis mellifera) abundance, drive variation in wild bumble bee (Bombus impatiens) pathogen loads. Specifically, we screened 890 bumble bee workers from varied habitats in Pennsylvania, USA for three pathogens (deformed wing virus, black queen cell virus, and Vairimorpha (= Nosema) bombi), Defensin expression, and body size. Bumble bees collected within low-quality landscapes exhibited the highest pathogen loads, with spring floral resources and nesting habitat availability serving as the main drivers. We also found higher loads of pathogens where honey bee apiaries are more abundant, a positive relationship between Vairimorpha loads and rainfall, and differences in pathogens by geographic region. Collectively, our results highlight the need to support high-quality landscapes (i.e., those with abundant floral/nesting resources) to maintain healthy wild bee populations.
Data from: Flower resource and land management drives hoverfly communities and bee abundance in semi-natural and agricultural grasslands
1. Pollination is a key ecosystem service, and appropriate management, particularly in agricultural systems, is essential to maintain a diversity of pollinator guilds. However, management recommendations frequently focus on maintaining plant communities, with the assumption that associated invertebrate populations will be sustained. 2. We tested whether plant community, flower resources and soil moisture would influence hoverfly (Syrphidae) abundance and species richness in floristically-rich semi-natural and floristically-impoverished agricultural grassland communities in Wales (U.K.), and compared these to two Hymenoptera genera, Bombus and Lasioglossum. Interactions between environmental variables were tested using generalised linear modelling, and hoverfly community composition examined using canonical correspondence analysis. 3. There was no difference in hoverfly abundance, species richness, or bee abundance, between grassland types. There was a positive association between hoverfly abundance, species richness and flower abundance in unimproved grasslands. However, this was not evident in agriculturally improved grassland, possibly reflecting intrinsically low flower resource in these habitats, or the presence of plant species with low or relatively inaccessible nectar resources. There was no association between soil moisture content and hoverfly abundance or species richness. 4. Hoverfly community composition was influenced by agricultural improvement and the amount of flower resource. Hoverfly species with semi-aquatic larvae were associated with both semi-natural and agricultural wet grasslands, possibly because of localised larval habitat. Despite the absence of differences in hoverfly abundance and species-richness, distinct hoverfly communities are associated with marshy grasslands, agriculturally improved marshy grasslands and unimproved dry grasslands, but not with improved dry grasslands. 5. Grassland plant community cannot be used as a proxy for pollinator community. Management of grasslands should aim to maximise the pollinator feeding resource, as well as maintain plant communities. Retaining waterlogged ground may enhance the number of hoverflies with semi-aquatic larvae.
Data from: Bumble bee nest abundance, foraging distance, and host-plant reproduction: implications for management and conservation
Recent reports of global declines in pollinator species imply an urgent need to assess the abundance of native pollinators and density-dependent benefits for linked plants. In this study, we investigated (1) pollinator nest distributions and estimated colony abundances, (2) the relationship between abundances of foraging workers and the number of nests they represent, (3) pollinator foraging ranges, and (4) the relationship between pollinator abundance and plant reproduction. We examined these questions in an alpine ecosystem in the Colorado Rocky Mountains, focusing on four alpine bumble bee species (Bombus balteatus, B. flavifrons, B. bifarius, and B. sylvicola), and two host plants that differ in their degrees of pollinator specialization (Trifolium dasyphyllum and T. parryi). Using microsatellites, we found that estimated colony abundances among Bombus species ranged from ~18 to 78 colonies/0.01 km2. The long-tongued species B. balteatus was most common, especially high above treeline, but the subalpine species B. bifarius was unexpectedly abundant for this elevation range. Nests detected among sampled foragers of each species were correlated with the number of foragers caught. Foraging ranges were smaller than expected for all Bombus species, ranging from 25 to 110 m. Fruit set for the specialized plant, Trifolium parryi, was positively related to the abundance of its Bombus pollinator. In contrast, fruit set for the generalized plant, T. dasyphyllum, was related to abundance of all Bombus species. Because forager abundance was related to nest abundance of each Bombus species and was an equally effective predictor of plant fecundity, forager inventories are probably suitable for assessing the health of outcrossing plant populations. However, nest abundance, rather than forager abundance, better reflects demographic and genetic health in populations of eusocial pollinators such as bumble bees. Development of models incorporating the parameters we have measured here (nest abundance, forager abundance, and foraging distance) could increase the usefulness of foraging worker inventories in monitoring, managing, and conserving pollinator populations.
Data from: Experimental small-scale flower patches increase species density but not abundance of small urban bees
1. Large flower plantings are often used to combat negative effects of habitat loss on pollinators, but whether these floral additions are effective at smaller scales remains unclear, particularly in urban settings. 2. To test the effectiveness of small-scale floral additions on enhancing urban bee populations, as well as their impact from one year to the next, different quantities of potted sweet alyssum (Lobularia maritima) flowers were placed across sites in Ann Arbor, Michigan for two consecutive years and the resulting Halictid bee visitors were monitored. 3. Overall we found the number of flowers added at the local level was significantly and positively correlated with small Halictid bee abundance and species density in an urban landscape. At smaller flower quantities dynamics were clearly linear, where incremental increases in number of flowers showed significant increases in bee abundance and species density. At larger quantities of floral additions, however, dynamics were nonlinear in that incremental increases in flower quantity had no effect on bee abundance and highly variable effects on bee species density. 4. When comparing the change in small Halictid bee abundance and species density from one year to the next, we found a significant increase in bee species density in the second year of small-scale floral additions, but no significant difference in bee abundance. 5. Synthesis and applications. Our results show that small flower plantings can have positive effects on small bee communities in urban systems even over a short period of time, and therefore confirm that encouraging citizens to plant flowers can be an effective conservation strategy for certain urban pollinator populations. In addition, our finding that smaller flower plantings may have higher impacts on small pollinators than larger plantings suggests resource managers interested in pollinator conservation should consider spreading multiple, smaller floral plantings across the urban landscape, rather than pooling all resources into one large flower patch.29-Nov-2017
Data from: Landscape complementation is a driver of bumble bee (Bombus sp.) abundance in the Canadian Rocky Mountains
<p><i>Context: </i>Land use change is a major factor influencing biodiversity, but the mechanisms that drive species losses require further examination. Habitat loss often reduces biodiversity, but habitat fragmentation can increase biodiversity when examined independently. Processes driving this pattern remain largely unclear.</p> <p><i>Objectives: </i>We aimed to determine the effects of habitat fragmentation on bumble bee populations after controlling for habitat amount, and to examine possible mechanisms behind observed effects.</p> <p><i>Methods: </i>We sampled 22 species of bumble bees (<i>Bombus</i> sp.) across 50 unique sites located throughout the Canadian Rockies using a sampling design that minimized correlations between amount and spatial arrangement of land covers that may represent important habitat for bees. We modeled bumble bee abundance, species richness and diversity as a function of land cover metrics.</p> <p><i>Results: </i>Effects of land cover fragmentation were dependent on both the measure of fragmentation used, and landscape scale. Bumble bee abundance was higher where nesting habitat (forest) and foraging habitat (grassland) were found adjacent to each other within 300 m, suggesting a landscape complementation effect where bees benefit from having access to both land cover types in proximity to one another. Having available habitat split into a greater number of patches was detrimental when considering the immediate area (0-300 m), but beneficial when quantified in more distant areas (300-600 m).</p> <p><i>Conclusions: </i>Landscape complementation may be an important component behind positive fragmentation effects. Estimates of multiple measures of fragmentation are important when testing the impacts of land cover and landscape changes on species abundance and biodiversity.</p>
Data from: Bee communities along a prairie restoration chronosequence: similar abundance and diversity, distinct composition
Recognition of the importance of bee conservation has grown in response to declines of managed honey bees and some wild bee species. Habitat loss has been implicated as a leading cause of declines, suggesting that ecological restoration is likely to play an increasing role in bee conservation efforts. In the Midwestern USA, restoration of tallgrass prairie has traditionally targeted plant community objectives without explicit consideration for bees. However, restoration of prairie vegetation is likely to provide ancillary benefits to bees through increased foraging and nesting resources. We investigated community assembly of bees across a chronosequence of restored eastern tallgrass prairies and compared patterns to those in control and reference habitats (old fields and prairie remnants, respectively). We collected bees for three years and measured diversity and abundance of in-bloom flowering plants, vegetation structure, ground cover, and surrounding land use as predictors of bee abundance and bee taxonomic and functional diversity. We found that site-level variables, but not site type or restoration age, were significant predictors of bee abundance (bloom diversity: p = 0.004, bare ground cover: p = 0.02) and bee diversity (bloom diversity: p = 0.01). There were significant correlations between overall composition of bee and blooming plant communities (mantel test: p = 0.002), and both plant and bee assemblages in restorations were intermediate between those of old fields and remnant prairies. Restorations exhibited high bee beta diversity, i.e., restored sites' bee assemblages were taxonomically and functionally differentiated from each other. This pattern was strong in younger restorations (< 20 years old), but absent from older restorations (> 20 years), suggesting restored prairie bee communities become more similar to one another and more similar to remnant prairie bee communities over time with the arrival of more species and functional groups of bees. Our results indicate that old fields, restorations, and remnants provide habitat for diverse and abundant bee communities, but continued restoration of old fields will help support and conserve bee communities more similar to reference bee communities characteristic of remnant prairies.
Data from: Honey bees are the most abundant visitors to Australian watermelon but native stingless bees are equally effective as pollinators
<p><span>Despite the benefits of a diverse approach to crop pollination, global food production remains reliant on a low diversity of managed pollinators, especially </span>the European honey bee (<em>Apis mellifera</em>). To facilitate more robust pollinator management and improve the resilience of the production system, it is necessary to understand regional variation in the pollination ecology of global food crops. Watermelon (<em>Citrullus lanatus</em> (Thunb.) Matsum. & Nakai) is a highly insect pollinator-dependent crop and even though it is grown globally across many different climate zones, little is known about its pollination ecology across the diverse growing regions of Australia, spanning from the tropics to the arid zone. We compared the species composition, visitation rates, and effectiveness of the dominant floral visitors on 15 farms across five major watermelon-growing regions of Australia. We found that insect species composition differed significantly among regions, but honey bees were the dominant watermelon flower visitor, with relative abundance varying from 73 - 94%. However, native bees (including stingless bees <em>Tetragonula</em> sp., and bees from Families Megachilidae, and Halictidae such as <em>Lasioglossum</em>, <em>Homalictus</em>, <em>Lipotriches</em>), and flies (particularly Syrphidae sp.) also visited and transferred pollen onto watermelon flowers. In particular, native stingless bees were common visitors in several growing regions and deposited similar amounts of pollen to honey bees. Our findings indicate that the Australian watermelon industry utilizes honey bees, but the diverse assemblage of available native pollinating taxa provides an additional opportunity for growers in specific growing regions. These native taxa may be encouraged in the production system by deploying managed populations (e.g. native stingless bee colonies), employing pollinator-safe land management practices, as well as exploring methods for increasing the efficiency of managed honey bee colonies.</p>
Data from: Prevalence and abundance of bees visiting major conventionally-managed agricultural crops in Brazil
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Bumble bees in landscapes with abundant floral resources have lower pathogen loads
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Data from: Social behavior in bees influences the abundance of Sodalis (Enterobacteriaceae) symbionts
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Data from: Honey bees are the most abundant visitors to Australian watermelon but native stingless bees are equally effective as pollinators
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Data from: Flower resource and land management drives hoverfly communities and bee abundance in semi-natural and agricultural grasslands
Open the record for dataset details and reuse information.
Data from: Bee communities along a prairie restoration chronosequence: similar abundance and diversity, distinct composition
Open the record for dataset details and reuse information.
Data from: Experimental small-scale flower patches increase species density but not abundance of small urban bees
Open the record for dataset details and reuse information.
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Allen Brain Atlas
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International Brain Laboratory public data
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OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.