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Variability in Sexual Pheromones Questions their Role in Bumblebee Pre-Mating Recognition System

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Abstract

Sex-specific chemical secretions have been widely used as diagnostic characters in chemotaxonomy. The taxonomically confused group of bumblebees has reaped the benefit of this approach through the analyses of cephalic labial gland secretions (CLGS). Most of currently available CLGS descriptions concern species from the West-Palearctic region but few from the New World. Here, the CLGS of four East-Palearctic species Bombus deuteronymus, B. filchnerae, B. humilis, and B. exil (subgenus Thoracobombus) are analysed. Our results show high levels of variability in the major compounds in B. exil. In contrast, we describe a low differentiation in CLGS compounds between B. filchnerae and its phylogenetically closely related taxon B. muscorum. Moreover, the chemical profiles of B. filchnerae and B. muscorum are characterized by low concentrations of the C16 component, which is found in higher concentrations in the other Thoracobombus species. This raises the possibility that courtship behavior as well as environmental constraints could affect the role of the bumblebee males’ CLGS.

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Acknowledgements

Financial support (IV) was provided by the Institute of Organic Chemistry and Biochemistry of the Academy of Sciences of the Czech Republic (#61388963). BM contributed as a PhD student with a grant from the FRS-FNRS (Fonds de la Recherche Scientifique). The authors are particularly grateful to Jean-Christophe Sandoz for all his advice and comments. We acknowledge Elizabeth Curtis for correcting the English.

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Supplementary file 1

- Data matrix of cephalic labial gland secretions (CLGS) (relative concentration of each compound), list of the identified compounds, kovats indice and IndVal analysis with specific compounds in Bombus deuteronymus superequester, B. exil, B. filchnerae, B. muscorum and B. humilis subbaicalensis. U indicates undetermined compounds. (XLSX 113 kb)

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Brasero, N., Lecocq, T., Martinet, B. et al. Variability in Sexual Pheromones Questions their Role in Bumblebee Pre-Mating Recognition System. J Chem Ecol 44, 9–17 (2018). https://doi.org/10.1007/s10886-017-0910-4

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