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15 results for “wild honeybees”
Wild pollinators and honeybees respond differently to landscape-scale organic farming and increase sunflower yields
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Red and white clover provide food resources for honeybees and wild bees in urban environments
<p>Pollination is a key ecological process both in wild plant species and in economically important crops. Global land use change and urbanization are known to alter plant-pollinator interactions, but our understanding of how the local (i.e. size of green area, food resource availability) and landscape (surrounding green area) context affect pollinators in urban landscapes remains understudied. We selected two co-occurring clover species, Trifolium pratense and T. repens. to assess whether mixed stands of common wildflowers provide resources for a diverse pollinator assemblage by supporting differently adapted/specialized pollinator species. We further wanted to test how environmental factors (flower diversity, resource availability, size and percentage of green area) alter plant-pollinator interactions in urban environments. We studied the pollinator assemblage and visitation rate of pollinators in 1 m² plots in 21 green areas of different sizes in the city of Vienna (Austria). In addition, we assessed the surrounding landscape context by estimating the percentage of green area in perimeters of 100 m, 500 m and 1000 m around each study plot and measured local flower resource availability. We found that proportions of pollinator taxa differed significantly between white and red clover, with T. repens mainly pollinated by Apis mellifera, and T. pratense primarily pollinated by different bumblebee species. Visitation frequency was positively correlated to local resource availability (number of anthetic Trifolium inflorescences in each plot), but independent of the surrounding landscape context (i.e. percentage of green area). We conclude that the establishment and maintenance even of small patches of different common wildflowers help maintain a diverse bee community in urban environments. Particularly large-flowered species may be important for supporting long-tongued, late emerging pollinators such as certain bumblebee species.</p>
Wildflower plantings and honeybee competition impact nutritional quality of wild bee diets
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Honeybees interfere with wild bees in apple pollination in China
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Red and white clover provide food resources for honeybees and wild bees in urban environments
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Data from: Gradual replacement of wild bees by honeybees in flowers of the Mediterranean Basin over the last 50 years
<p>Evidence for pollinator declines largely originates from mid-latitude regions in North America and Europe. Geographical heterogeneity in pollinator trends combined with geographical biases in pollinator studies, can produce distorted extrapolations and limit understanding of pollinator responses to environmental changes. In contrast to the declines experienced in some well-investigated European and North American regions, honeybees seem to have increased recently in some areas of the Mediterranean Basin. Since honeybees can have negative impacts on wild bees, it was hypothesized that a biome-wide alteration in bee pollinator assemblages may be underway in the Mediterranean Basin involving a reduction in the relative number of wild bee pollinators. This hypothesis was tested using published quantitative data on bee pollinators of wild and cultivated plants from studies conducted between 1963-2017 in 13 Mediterranean countries. The density of honeybee colonies increased exponentially and wild bees were gradually replaced by honeybees in flowers of wild and cultivated plants. The proportion of wild bees at flowers was four times greater than that of honeybees at the beginning of the period, the proportions of both groups becoming roughly similar fifty years later. The Mediterranean Basin is a world biodiversity hotspot for wild bees and wild bee-pollinated plants, and the ubiquitous rise of honeybees to dominance as pollinators could in the long run undermine the diversity of plants and wild bees in the region.</p>
Data from: Trypanosomatid parasites infecting managed honeybees and wild solitary bees
The parasite Crithidia mellificae (Kinetoplastea: Trypanosomatidae) infects honeybees, Apis mellifera. No pathogenic effects have been found in individual hosts, despite positive correlations between infections and colony mortalities. The solitary bee Osmia cornuta might constitute a host, but controlled infections are lacking to date. Here, we challenged male and female O. cornuta and honeybee workers in laboratory cages with C. mellificae. No parasite cells were found in any control. Parasite numbers increased 6.6 fold in honeybees between days 6 and 19 p.i. and significantly reduced survival. In O. cornuta, C. mellificae numbers increased 2 to 3.6 fold within cages and significantly reduced survival of males, but not females. The proportion of infected hosts increased in O. cornuta cages with faeces, but not in honeybee cages without faeces, suggesting faecal - oral transmission. The data show that O. cornuta is a host of C. mellificae and suggest that males are more susceptible. The higher mortality of infected honeybees proposes a mechanism for correlations between C. mellificae infections and colony mortalities.
Data from: Experimental evidence that honeybees depress wild insect densities in a flowering crop
While addition of managed honeybees (Apis mellifera) improves pollination of many entomophilous crops, it is unknown if it simultaneously suppresses the densities of wild insects through competition. To investigate this, we added 624 honeybee hives to 23 fields of oilseed rape (Brassica napus L.) over 2 years and made sure that the areas around 21 other fields were free from honeybee hives. We demonstrate that honeybee addition depresses the densities of wild insects (bumblebees, solitary bees, hoverflies, marchflies, other flies, and other flying and flower-visiting insects) even in a massive flower resource such as oilseed rape. The effect was independent of the complexity of the surrounding landscape, but increased with the size of the crop field, which suggests that the effect was caused by spatial displacement of wild insects. Our results have potential implications both for the pollination of crops (if displacement of wild pollinators offsets benefits achieved by adding honeybees) and for conservation of wild insects (if displacement results in negative fitness consequences).
Pesticide risk during commercial apple pollination is greater for honeybees than other managed and wild bees
<p>Data and code relating to the manuscript “Pesticide risk during commercial apple pollination is greater for honeybees than other managed and wild bees”</p> <p>Files are organized as follows</p> <p><strong>input</strong> - contains the main data files.</p> <ul> <li> <p>all_pesticide2019.csv – contains the pesticide residue data for all samples</p> </li> <li> <p>LD50.csv – contains pesticide LD50s in PPB</p> </li> <li> <p>ld50_per_bee.csv – contains pesticide LD50s in ug / honeybee</p> </li> <li> <p>nesting_type.csv – lists nesting types of the different bee samples</p> </li> <li> <p>pesticide_type.csv – lists pesticides by their type</p> </li> <li> <p>short_name.csv – lists short bee names</p> <p><strong>folder “gis”</strong></p> <ul> <li>hive_distance_matrix.csv – distances from each orchard to other sites</li> <li>sitelocation.csv – contains coordinates of sites</li> </ul> </li> </ul> <p><strong>code</strong> - contains the scripts to analyze the input files</p> <ul> <li>pesticide_analysis.R – is the main anaylsis for the paper</li> <li>unadjusted_pesticide_analysis.R – is a copy of most of the code above but without LD50 weight adjustements</li> </ul> <p><strong>ld50 adjust</strong> - contains the inputs and code for the ld50 adjustments I ran</p> <ul> <li>ld50_adjust.R – is the code to calculate our the adjustements</li> <li>2020_BeeTox_database_acute_contact_publication_final_R1.csv – is the data file taken from pamminger publication</li> </ul>
Data from: Temporal variation in the genetic structure of a drone congregation area: An insight into the population dynamics of wild African honeybees (Apis mellifera scutellata)
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Data from: Gradual replacement of wild bees by honeybees in flowers of the Mediterranean Basin over the last 50 years
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Data from: Trypanosomatid parasites infecting managed honeybees and wild solitary bees
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Data from: Experimental evidence that honeybees depress wild insect densities in a flowering crop
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Data from: Knock-on community impacts of a novel vector: spillover of emerging DWV-B from Varroa-infested honeybees to wild bumblebees
Novel transmission routes can directly impact the evolutionary ecology of infectious diseases, with potentially dramatic effect on host populations and knock-on effects on the wider host community. The invasion of Varroa destructor, an ectoparasitic viral vector in Western honeybees, provides a unique opportunity to examine how a novel vector affects disease epidemiology in a host community. This specialist honeybee mite vectors deformed wing virus (DWV), an important re-emerging honeybee pathogen that also infects wild bumblebees. Comparing island honeybee and wild bumblebee populations with and without V. destructor, we show that V. destructor drives DWV prevalence and titre in honeybees and sympatric bumblebees. Viral genotypes are shared across hosts, with the potentially more virulent DWV-B overtaking DWV-A in prevalence in a current epidemic. This demonstrates disease emergence across a host community driven by the acquisition of a specialist novel transmission route in one host, with dramatic community level knock-on effects.
Data from: Knock-on community impacts of a novel vector: spillover of emerging DWV-B from Varroa-infested honeybees to wild bumblebees
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OpenNeuro
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