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<p>Bee communities often respond positively to wildfire, but little is known about their foraging behavior and pollen use in recently burned forests despite their link to demographic processes. We used palynological analysis to reconstruct how female <i>Osmia lignaria</i> – a native, solitary nesting species – provisioned pollen to offspring in post-fire areas and evaluate its influence on adult overwinter survival and body size. We placed artificial nest blocks with a standardized number of adult <i>O. lignaria</i> cocoons on 33 sites across a fire severity gradient in southwest Oregon, USA. We found that females provisioned several woody pollen species to offspring – dominated by beaked hazel (<i>Corylus cornuta</i>), salal (<i>Gaultheria shallon</i>) and California huckleberry (<i>Vaccinium ovatum</i>) – and the composition of these dominant pollen types was similar across the fire severity gradient despite strong differences in floral resource density. Nesting females provisioned male and female offspring a similar diversity of pollen types regardless of fire severity, and the number of pollen types consumed by offspring had no detectable influence on their overwinter survival or cocoon mass, a proxy for body size. Our results indicate that woody species are important food resources for <i>O. lignaria</i> in recently burned mixed conifer forests, and that management actions that promote woody species after wildfire occurs is likely to promote populations of the blue orchard bee and other solitary bee species.</p>

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Post-Wildfire Offspring Provisioning by a Solitary Bee is Dominated by Woody Pollen Sources and Uninfluenced by Wildfire Severity

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • James W. Rivers,
  • Nicole C. S. Bell,
  • Sara M. Galbraith,
  • Kendra R. DelToro,
  • Jen J.-M. Hayes,
  • Andrew R. Moldenke

摘要

Bee communities often respond positively to wildfire, but little is known about their foraging behavior and pollen use in recently burned forests despite their link to demographic processes. We used palynological analysis to reconstruct how female Osmia lignaria – a native, solitary nesting species – provisioned pollen to offspring in post-fire areas and evaluate its influence on adult overwinter survival and body size. We placed artificial nest blocks with a standardized number of adult O. lignaria cocoons on 33 sites across a fire severity gradient in southwest Oregon, USA. We found that females provisioned several woody pollen species to offspring – dominated by beaked hazel (Corylus cornuta), salal (Gaultheria shallon) and California huckleberry (Vaccinium ovatum) – and the composition of these dominant pollen types was similar across the fire severity gradient despite strong differences in floral resource density. Nesting females provisioned male and female offspring a similar diversity of pollen types regardless of fire severity, and the number of pollen types consumed by offspring had no detectable influence on their overwinter survival or cocoon mass, a proxy for body size. Our results indicate that woody species are important food resources for O. lignaria in recently burned mixed conifer forests, and that management actions that promote woody species after wildfire occurs is likely to promote populations of the blue orchard bee and other solitary bee species.