Abstract
Among the large number of exocrine glands described in bees, the tarsal glands were thought to be the source of footprint scent marks. However, recent studies showed that the compounds used for marking by stingless bees are secreted by leg tendon instead of tarsal glands. Here, we report on the structure of leg tendon glands in males of Bombus terrestris, together with a description of the chemical composition of their secretions and respective changes of both during the males’ lives. The ultrastructure of leg tendon glands shows that the secretory cells are located in three independent regions, separated from each other by unmodified epidermal cells: in the femur, tibia, and basitarsus. Due to the common site of secretion release, the organ is considered a single secretory gland. The secretion of the leg tendon glands of B. terrestris males differs in its composition from those of workers and queens, in particular by (1) having larger proportions of compounds with longer chain lengths, which we identified as wax esters; and (2) by the lack of certain hydrocarbons (especially long chain dienes). Other differences consist in the distribution of double bond positions in the unsaturated hydrocarbons that are predominantly located at position 9 in males but distributed at seven to nine different positions in the female castes. Double bond positions may change chemical and physical properties of a molecule, which can be recognized by the insects and, thus, may serve to convey specific information. The function of male-specific compounds identified from their tendon glands remains elusive, but several possibilities are discussed.
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Acknowledgments
This work was financially supported by the Technological Agency of the Czech Republic (project no. TA01020969) and by the Academy of Sciences of the Czech Republic (research project RVO: 61388963). S.J. is supported by a research grant from the German Research Council, DFG (project no. JA 1715/3-1). The authors also wish to thank Alena Bučánková for providing part of the biological material and to the staff of the Laboratory of Electron microscopy (Charles University in Prague) for their help with TEM sample preparation.
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Communicated by: Sven Thatje
Stefan Jarau and Petr Žáček contributed equally to this work.
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Jarau, S., Žáček, P., Šobotník, J. et al. Leg tendon glands in male bumblebees (Bombus terrestris): structure, secretion chemistry, and possible functions. Naturwissenschaften 99, 1039–1049 (2012). https://doi.org/10.1007/s00114-012-0986-1
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DOI: https://doi.org/10.1007/s00114-012-0986-1