Wild bee abundance declines with urban warming, regardless of floral density

2018 ◽  
Vol 21 (3) ◽  
pp. 419-428 ◽  
Author(s):  
April L. Hamblin ◽  
Elsa Youngsteadt ◽  
Steven D. Frank
Keyword(s):  
Wild Bee ◽  
Urban Warming ◽  
Floral Density ◽  
Bee Abundance

scholarly journals Noncrop Habitat Use by Wild Bees (Hymenoptera: Apoidea) in a Mixed-Use Agricultural Landscape

2020 ◽  
Vol 49 (2) ◽  
pp. 502-515 ◽  
Author(s):  
Brianne Du Clos ◽  
Francis A Drummond ◽  
Cynthia S Loftin
Keyword(s):  
United States ◽  
Floral Resources ◽  
Northeastern United States ◽  
Wild Bees ◽  
Wild Bee ◽  
Lowbush Blueberry ◽  
Mixed Use ◽  
Abundance And Diversity ◽  
Bee Communities ◽  
Bee Abundance

Abstract Homogeneous, agriculturally intense landscapes have abundant records of pollinator community research, though similar studies in the forest-dominated, heterogeneous mixed-use landscape that dominates the northeastern United States are sparse. Trends of landscape effects on wild bees are consistent across homogeneous agricultural landscapes, whereas reported studies in the northeastern United States have not found this consistency. Additionally, the role of noncrop habitat in mixed-use landscapes is understudied. We assessed wild bee communities in the mixed-use lowbush blueberry (Vaccinium angustifolium Ait.) production landscape of Maine, United States at 56 sites in eight land cover types across two regional landscapes and analyzed effects of floral resources, landscape pattern, and spatial scale on bee abundance and species richness. Within survey sites, cover types with abundant floral resources, including lowbush blueberry fields and urban areas, promoted wild bee abundance and diversity. Cover types with few floral resources such as coniferous and deciduous/mixed forest reduced bee abundance and species richness. In the surrounding landscape, lowbush blueberry promoted bee abundance and diversity, while emergent wetland and forested land cover strongly decreased these measures. Our analysis of landscape configuration revealed that patch mixing can promote wild bee abundance and diversity; however, this was influenced by strong variation across our study landscape. More surveys at intra-regional scales may lead to better understanding of the influence of mixed-use landscapes on bee communities.

Changes in the Summer Wild Bee Community Following a Bark Beetle Outbreak in a Douglas-fir Forest

2020 ◽  
Vol 49 (6) ◽  
pp. 1437-1448 ◽  
Author(s):  
Gabriel G Foote ◽  
Nathaniel E Foote ◽  
Justin B Runyon ◽  
Darrell W Ross ◽  
Christopher J Fettig
Keyword(s):  
United States ◽  
Species Richness ◽  
Bark Beetle ◽  
Tree Mortality ◽  
Canopy Cover ◽  
Douglas Fir ◽  
Wild Bee ◽  
Bee Community ◽  
Bee Communities ◽  
Bee Abundance

Abstract The status of wild bees has received increased interest following recent estimates of large-scale declines in their abundances across the United States. However, basic information is limited regarding the factors affecting wild bee communities in temperate coniferous forest ecosystems. To assess the early responses of bees to bark beetle disturbance, we sampled the bee community of a Douglas-fir, Pseudotsuga menziesii (Mirb.), forest in western Idaho, United States during a Douglas-fir beetle, Dendroctonus pseudotsugae Hopkins (Coleoptera: Curculionidae), outbreak beginning in summer 2016. We resampled the area in summer 2018 following reductions in forest canopy cover resulting from mortality of dominant and codominant Douglas-fir. Overall, results from rarefaction analyses indicated significant increases in bee diversity (Shannon’s H) in 2018 compared to 2016. Results from ANOVA also showed significant increases in bee abundance and diversity in 2018 compared to 2016. Poisson regression analyses revealed percent tree mortality from Douglas-fir beetle was positively correlated with increases in total bee abundance and species richness, where community response variables displayed a cubic trend with percent tree mortality. Percent reduction in canopy cover from 2016 to 2018 was also correlated with bee species richness and diversity. These findings suggest that wild bee communities may benefit from changes in forest structure following bark beetle outbreaks.

scholarly journals Relationships between wild bee abundance and fruit set of Camellia oleifera Abel

2020 ◽  
Author(s):  
Hongying Li ◽  
Michael C. Orr ◽  
Ancai Luo ◽  
Feiyue Dou ◽  
Ruomei Kou ◽  
...  
Keyword(s):  
Fruit Set ◽  
Camellia Oleifera ◽  
Wild Bee ◽  
Bee Abundance

Native wildflower plantings support wild bee abundance and diversity in agricultural landscapes across the United States

2015 ◽  
Vol 25 (8) ◽  
pp. 2119-2131 ◽  
Author(s):  
Neal M. Williams ◽  
Kimiora L. Ward ◽  
Nathaniel Pope ◽  
Rufus Isaacs ◽  
Julianna Wilson ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Agricultural Landscapes ◽  
Wild Bee ◽  
Abundance And Diversity ◽  
Bee Abundance

scholarly journals Modeling the status, trends, and impacts of wild bee abundance in the United States

2015 ◽  
Vol 113 (1) ◽  
pp. 140-145 ◽  
Author(s):  
Insu Koh ◽  
Eric V. Lonsdorf ◽  
Neal M. Williams ◽  
Claire Brittain ◽  
Rufus Isaacs ◽  
...  
Keyword(s):  
United States ◽  
The United States ◽  
Habitat Model ◽  
Wild Plant ◽  
Wild Bees ◽  
Natural Habitats ◽  
Row Crops ◽  
Wild Bee ◽  
The Status ◽  
Bee Abundance

Wild bees are highly valuable pollinators. Along with managed honey bees, they provide a critical ecosystem service by ensuring stable pollination to agriculture and wild plant communities. Increasing concern about the welfare of both wild and managed pollinators, however, has prompted recent calls for national evaluation and action. Here, for the first time to our knowledge, we assess the status and trends of wild bees and their potential impacts on pollination services across the coterminous United States. We use a spatial habitat model, national land-cover data, and carefully quantified expert knowledge to estimate wild bee abundance and associated uncertainty. Between 2008 and 2013, modeled bee abundance declined across 23% of US land area. This decline was generally associated with conversion of natural habitats to row crops. We identify 139 counties where low bee abundances correspond to large areas of pollinator-dependent crops. These areas of mismatch between supply (wild bee abundance) and demand (cultivated area) for pollination comprise 39% of the pollinator-dependent crop area in the United States. Further, we find that the crops most highly dependent on pollinators tend to experience more severe mismatches between declining supply and increasing demand. These trends, should they continue, may increase costs for US farmers and may even destabilize crop production over time. National assessments such as this can help focus both scientific and political efforts to understand and sustain wild bees. As new information becomes available, repeated assessments can update findings, revise priorities, and track progress toward sustainable management of our nation’s pollinators.

scholarly journals The effect of repeated, lethal sampling on wild bee abundance and diversity

2015 ◽  
Vol 6 (9) ◽  
pp. 1044-1054 ◽  
Author(s):  
Zachariah J. Gezon ◽  
Eli S. Wyman ◽  
John S. Ascher ◽  
David W. Inouye ◽  
Rebecca E. Irwin
Keyword(s):  
Wild Bee ◽  
Abundance And Diversity ◽  
Bee Abundance

scholarly journals Does urbanization favour exotic bee species? Implications for the conservation of native bees in cities

2019 ◽  
Vol 15 (12) ◽  
pp. 20190574 ◽  
Author(s):  
Gordon Fitch ◽  
Caleb J. Wilson ◽  
Paul Glaum ◽  
Chatura Vaidya ◽  
Maria-Carolina Simao ◽  
...  
Keyword(s):  
Native Species ◽  
Negative Relationship ◽  
Native Bees ◽  
Urban Warming ◽  
Native Bee ◽  
Pollinator Conservation ◽  
Growing Body ◽  
Key Sites ◽  
Bee Communities ◽  
Bee Abundance

A growing body of research indicates that cities can support diverse bee communities. However, urbanization may disproportionately benefit exotic bees, potentially to the detriment of native species. We examined the influence of urbanization on exotic and native bees using two datasets from Michigan, USA. We found that urbanization positively influenced exotic—but not native—bee abundance and richness, and that this association could not be explained by proximity to international ports of entry, prevalence of exotic flora or urban warming. We found a negative relationship between native and exotic bee abundance at sites with high total bee abundance, suggesting that exotic bees may negatively affect native bee populations. These effects were not driven by the numerically dominant exotic honeybee, but rather by other exotic bees. Our findings complicate the emerging paradigm of cities as key sites for pollinator conservation.

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