Abstract
Urbanization is considered one of the major threats to biodiversity worldwide, with a special concern for native species decline, including wild bees. Through the increase of impervious surfaces, urbanization diminishes, fragments, and warms city environments, significantly reducing nesting and foraging resources for bees. Understanding the response of wildlife to urbanization in terms of reproduction, foraging efficiency, and offspring provisioning is important to species conservation in the face of continued urban development. In this study, we investigated how different levels of urbanization affect individual foraging effort, survival, brood productivity, and fitness in Ceratina calcarata. Our findings show that low urbanization levels favour larger-bodied adults, but foraging efforts (determined by wing wear) were higher at moderate disturbance levels. Larger-bodied mothers produced more numerous offspring (clutch size), mainly in medium disturbance sites. Likewise, larger-bodied mothers produced a larger-bodied offspring at low urbanization levels. Our results indicate that wild bees benefit from low and medium levels of urbanization indicated by maternal and offspring fitness in terms of body size and the number of brood, respectively. This suggests significant effects of urbanization on the fitness and stability of wild bee populations. This study provides novel insights into the impact of urban land use and highlights the importance of conserving and providing green spaces for pollinators.
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Raw data that support the findings of this study are available upon request.
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Acknowledgements
We thank members of the Rehan lab for providing valuable feedback on earlier versions of this manuscript. Thanks to Mariam Shamekh and Phuong Nguyen for assistance with nest dissections and processing of bee specimens.
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Funding for this study was provided by NSERC Discovery grants, supplements, and an E.W.R. Steacie Memorial Fellowship to SMR.
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ACA, JLH and MMRK performed material preparation and data collection. SNRB, MMRK and SMR performed data analysis. SNRB and SMR wrote the manuscript. SMR conceived and funded the study. All authors reviewed the manuscript.
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Brasil, S.N.R., Khair, M., Ayers, A.C. et al. Urban landscapes affect wild bee maternal investment and body size. Urban Ecosyst 26, 1319–1329 (2023). https://doi.org/10.1007/s11252-023-01378-0
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DOI: https://doi.org/10.1007/s11252-023-01378-0