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77 results for “floral resource”
Data from: How a generalist bee achieves high efficiency of pollen collection on diverse floral resources
Bees foraging for floral rewards are one of our most thoroughly studied examples of generalist foraging ecology. Generalist bees rely considerably on instrumental (associative) learning to acquire routines that allow them to collect nectar efficiently from diverse plant species. Although such bees must also collect pollen from diverse species, few studies have examined if and how high efficiency is achieved. We characterized how generalist bumble bees (Bombus impatiens) foraged effectively for pollen from diverse floral resources, by manipulating the presence of pollen and anther cues, in a series of experiments using pollen-bearing live flowers, flowers of a sterile pollenless horticultural hybrid, and artificial flowers. We show that generalist bumble bees exhibit flexible and effective pollen collection by switching between 2 routines: "scrabbling" when pollen is abundant and "sonicating" when pollen is scarce. Efficient switching between these behaviors is regulated by the interplay of 2 ubiquitous floral cues: chemical anther cues stimulating pollen collection behavior and mechanical pollen cues suppressing sonication (and eliciting scrabbling). Flexible pollen collection behavior is functional: When pollen on anthers was scarce, bees collected it at a greater rate by sonicating than scrabbling. This mechanism of behavioral flexibility likely allows generalist bees to handle diverse anther morphologies efficiently and may have facilitated the recurrent evolution of plant species that conceal pollen rewards via pored floral morphology. Whereas effective nectar foraging relies heavily on associative learning of unique routines for each flower type, a weighing of 2 types of cues regulates the flexible pollen collection mechanism we describe.
Supplementary material 2 from: Bila Dubaić J, Plećaš M, Raičević J, Lanner J, Ćetković A (2022) Early-phase colonisation by introduced sculptured resin bee (Hymenoptera, Megachilidae, Megachile sculpturalis) revealed by local floral resource variability. NeoBiota 73: 57-85. https://doi.org/10.3897/neobiota.73.80343
Study area – Belgrade (Serbia): basic topography, biogeography, ecological patterns and urbanistic zonation
Supplementary material 3 from: Bila Dubaić J, Plećaš M, Raičević J, Lanner J, Ćetković A (2022) Early-phase colonisation by introduced sculptured resin bee (Hymenoptera, Megachilidae, Megachile sculpturalis) revealed by local floral resource variability. NeoBiota 73: 57-85. https://doi.org/10.3897/neobiota.73.80343
Quantitative survey of distribution and abundance parameters of M. sculpturalis and S. japonicum in the Belgrade area in August 2019
Data from: Trait-based effects of plant invasion on floral resources, hoverflies and bees
<p>1. Plant invasions can lead to homogeneous communities with decreased functional diversity. However, invasive plants, with various morphological and phenological traits, may drive pollinator communities in a less predictable, more complex way. They can promote pollinators compatible with their floral traits while leaving others without foraging resources.</p> <p>2. Our observational study on 10 invasive herbaceous species applied a trait-based approach to investigate plant invasion-driven changes in floral resources, hoverfly, and bee communities. We sampled invaded and non-invaded (control) sites before and during the flowering of the invasive plants. We analysed the differences in floral traits between invasive and native plants, functional diversity, and trait distributions of flower and pollinator communities between the invaded and control sites.</p> <p>3. Five invasive plant species differed from natives in floral traits. Plant invasion caused species-specific changes in functional diversity and trait distributions of communities. For instance, invaded sites had a decreased functional diversity of hoverflies before flowering of invasive species, and larger hoverflies during flowering of invasive species compared with control sites. Smaller bees were associated with invasive plants with shallow flowers, while larger and long-tongued bees were associated with two invasive species with restricted floral access.</p> <p>4. Similar to previous studies, pollinator traits showed mixed or neutral responses to plant invasion. This is probably due to the high integration capability of invasive plants into plant-pollinator systems, or limitations in sampling, trait resolution, and unrevealed environmental factors. We provide recommendations for future studies to better understand the trait-based community composition of flowering plants and pollinators.</p>
Data from: Trait-based effects of plant invasion on floral resources, hoverflies and bees
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Bumble bees in landscapes with abundant floral resources have lower pathogen loads
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Data from: Phenology of farmland floral resources reveals seasonal gaps in nectar availability for bumblebees
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Data from: Exotic flower visitors exploit large floral trait spaces resulting in asymmetric resource partitioning with native visitors
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Data from: Foraging strategies of generalist and specialist Old World nectar bats in response to temporally variable floral resources
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Data from: Resource- and pollinator-mediated selection on floral traits
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Exploitative competition for floral resources reduces sugar intake but differently impacts the foraging behaviour of two non-bee flower visitors
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Data from: Managing trap-nesting bees as crop pollinators: spatiotemporal effects of floral resources and antagonists
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Richness and abundance of both butterflies and floral resources in residential gardens across southwestern Melbourne, Australia’s greater metropolitan area
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Data from: How a generalist bee achieves high efficiency of pollen collection on diverse floral resources
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Data from: Local and landscape-level floral resources explain effects of wildflower strips on wild bees across four European countries
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Data for: Biogeographic history predicts bee community structure across floral resource gradients in southeast Australia
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Spatially discrete disturbance processes enhance grassland floral resources
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Data from: Responses of social and solitary bees to pulsed floral resources
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Data from: Floral resource diversification promotes solitary bee reproduction and may offset insecticide effects – evidence from a semi-field experiment
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Landscape composition and local floral resources influence foraging behavior but not the size of Bombus impatiens Cresson (Hymenoptera: Apidae) workers
<p>Here, we assessed how the morphology, weight and foraging behavior of individual workers are affected by their surrounding landscape. We hypothesized that colonies established in landscapes showing high cover of intensive crops and low cover of flowering crops, as well as low amounts of local floral resources, would produce smaller workers, which would perform fewer foraging trips and collect pollen loads less constant in species composition. We tested these predictions with 80 colonies of commercially reared <i>Bombus impatiens</i> Cresson placed in 20 landscapes spanning a gradient of agricultural intensification in southern Québec, Canada. We estimated weekly rate at which workers entered and exited colonies and captured eight workers per colony over a period of 14 weeks during the spring and summer of 2016. Captured workers had their wing, thorax, head, tibia, and dry weight measured, as well as their pollen load extracted and identified to the lowest possible taxonomic level. We did not detect any effect of landscape habitat composition on worker morphology or body weight, but found that foraging activity decreased with intensive crops. Moreover, higher diversity of local floral resources led to lower pollen constancy in intensively cultivated landscapes. Finally, we found a negative correlation between the size of workers and the diversity of their pollen load. Our results provide additional evidence that conservation actions regarding pollinators in arable landscapes should be made at the landscape rather than at the farm level.</p>
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DANDI Archive for NWB datasets
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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.