Abstract
Wild bees are facing many environmental challenges that are reshaping their distributions and even causing extinctions. One of the common threats is climate change leading to a higher frequency of extreme climatic events such as heat waves. We focused on the bee fauna of the eastern Mediterranean country of Lebanon and assessed intra- and interspecific variability of the heat stress resistance in correlation with dry body weight, altitude, and collection date. We used the time before heat stupor (THS) at 40 °C in semi-controlled conditions as a proxy for heat resistance. We found significant interspecific differences in heat resistance, and a positive correlation with dry weight in some taxa. At the intraspecific level, there was a significant difference in heat resistance between sexes for some species. Also, dry/fresh weights, altitude, and collection date were correlated to a higher heat resistance in some taxa. In the context of global changes, we argue that we need heat tolerance metrics for a better understanding of bee decline and to enhance conservation measures at regional scale.
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Data Availability
Measured variables of tested specimens with geographic coordinates of the collecting sites are available in Supplementary Material A .
Code Availability
R scripts related to the analysis of hyperthermic resistance of bees are all available on request at corresponding author.
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Acknowledgements
We would like to thank the three people who were directly involved in the field work facilitation: Challita Tanios (Director of Tannourine Cedar Nature Reserve), Sandra Koussa Saba (Director of Horch Ehden Nature Reserve) and Charbel Tawk (Committee of the Cedar Forest Friends, Bcharre). Our thanks go to the people who assisted in the field collections, Antoine Gekière, Jad Jabbour, Mariam Fakhry, Nancy Abi Khalil, and Xavier Van Achter. We thank Thomas James Wood (University of Mons) for proofreading this paper.
Funding
MB was funded by the University of Mons for her Ph-D research. BM was funded by Fonds National de la Recherche Scientifique (postdoctoral researcher, Chargé de Recherche, F.R.S.-FNRS). DM was supported in this work by the Fonds National de la Recherche Scientifique (F.R.S.-FNRS) and the Fonds Wetenschappelijk Onderzoek (FWO) joint programme “EOS – Excellence Of Science” (Belgium) for the project named “CliPS: Climate change and its effects on Pollination Services (project 30947854)". ¨PR was funded by the University of Mons. NN was funded by the Holy Spirit University of Kaslik.
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MB: Conceptualization, Data curation, Formal analysis, Writing—Original Draft. BM: Conceptualization, Formal analysis, Writing- Reviewing and Editing. DM: Funding acquisition, Writing- Reviewing and Editing. NN: Supervision, Writing- Reviewing and Editing. PR: Conceptualization, Funding acquisition, Supervision.
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Boustani, M., Martinet, B., Michez, D. et al. Heat resistance variability in the Lebanese bee fauna. Apidologie 55, 29 (2024). https://doi.org/10.1007/s13592-024-01070-y
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DOI: https://doi.org/10.1007/s13592-024-01070-y