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Characteristic Odor of Osmoderma eremita Identified as a Male-Released Pheromone

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Abstract

Osmoderma eremita (Scopoli) is an endangered scarab beetle living in hollow trees. It has mainly been known for its characteristic odor, typically described as a fruity, peachlike or plumlike aroma. The odor emanating from a single beetle can sometimes be perceived from a distance of several meters. In this paper, we show that the characteristic odor from O. eremita is caused by the compound (R)-(+)-γ-decalactone, released in large quantities mainly or exclusively by male beetles. Antennae from male and female beetles responded in a similar way to (R)-(+)-γ-decalactone in electroantennographic recordings. Field trapping experiments showed that (R)-(+)-γ-decalactone is a pheromone attracting female beetles. Lactones similar to (R)-(+)-γ-decalactone are frequently used as female-released sex pheromones by phytophagous scarabs. This is, however, the first evidence of a lactone used as a male-produced pheromone in scarab beetles. We propose that the strong signal from males is a sexually selected trait used to compete for females and matings. The signal could work within trees but also act as a guide to tree hollows, which are an essential resource for O. eremita. Males may, thus, attract females dispersing from their natal tree by advertising a suitable habitat. This signal could also be exploited by other males searching for tree hollows or for females, which would explain the catch of several males in our traps.

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Correspondence to Mattias C. Larsson.

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Larsson, M.C., Hedin, J., Svensson, G.P. et al. Characteristic Odor of Osmoderma eremita Identified as a Male-Released Pheromone. J Chem Ecol 29, 575–587 (2003). https://doi.org/10.1023/A:1022850704500

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