Data from: Asteraceae pollen provisions protect Osmia mason bees (Hymenoptera: Megachilidae) from brood parasitism

Spear DM, Silverman S, Forrest JRK

Date Published: February 10, 2016

DOI: http://dx.doi.org/10.5061/dryad.4sd09

 

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Title sapygid_parasitism_2008-2015
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Description Incidence of parasitism by sapygid wasps on species of Osmia using different types of pollen, based on trapnests established at multiple field sites between 2008 and 2015. Please consult the ReadMe file for details.
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Title sapygid_pollen_experiment
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Description Many specialist herbivores eat foods that are apparently "low-quality". The compensatory benefits of a poor diet may include protection from natural enemies. Several bee lineages specialize on pollen of the plant family Asteraceae, which is known to be a poor-quality food. Here we tested the hypothesis that specialization on Asteraceae pollen protects bees from parasitism. We compared rates of brood parasitism by Sapyga wasps on Asteraceae-specialist, Fabeae-specialist, and other species of Osmia bees in the field over several years and sites, and found that Asteraceae-specialist species were parasitized significantly less frequently than other species. We then tested the effect of Asteraceae pollen on parasites by raising Sapyga larvae on three pollen mixtures: Asteraceae, Fabeae, and generalist (a mix of primarily non-Asteraceae pollens). Survival of parasite larvae was significantly reduced on Asteraceae provisions. Our results suggest that specialization on low-quality pollen may evolve because it helps protect bees from natural enemies.
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When using this data, please cite the original publication:

Spear DM, Silverman S, Forrest JRK (2016) Asteraceae pollen provisions protect Osmia mason bees (Hymenoptera: Megachilidae) from brood parasitism. The American Naturalist 187(6): 797-803. http://dx.doi.org/10.1086/686241

Additionally, please cite the Dryad data package:

Spear DM, Silverman S, Forrest JRK (2016) Data from: Asteraceae pollen provisions protect Osmia mason bees (Hymenoptera: Megachilidae) from brood parasitism. Dryad Digital Repository. http://dx.doi.org/10.5061/dryad.4sd09
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