Volatile compounds released by disturbed and undisturbed adults of Anchomenus dorsalis (Coleoptera, Carabidae, Platynini) and structure of the pygidial gland |
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Authors: | Bonacci Teresa Brandmayr Pietro Zetto Tullia Perrotta Ida Daniela Guarino Salvatore Peri Ezio Colazza Stefano |
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Affiliation: | Department of Ecology, Università degli Studi della Calabria - via P. Bucci s.n., 87036, Rende (CS), Ital. |
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Abstract: | Volatile compounds produced by adults of Anchomenus dorsalis under undisturbed and disturbed conditions were investigated with an all-glass aeration apparatus. GC-MS analysis of the crude extracts from undisturbed and disturbed adults highlighted four major volatile compounds, undecane, heneicosane, Z-9 tricosene and tricosane, of which significantly more undecane was released by disturbed adults compared to undisturbed beetles. The pygidial glands of adults of Anchomenus dorsalis were investigated using light and Transmission Electron Microscopy (TEM). Each gland showed dense aggregates of secretory cells organized into visually distinct lobes; a long collecting canal that drains the secretion towards the reservoir, a bean-shaped double lobed muscular reservoir in which secretion is stored and a short duct (efferent duct) through which the secretion is discharged. The function of the pygidial glands and the possible role played by undecane as a defensive allomone and/or chemical signalling molecule are discussed. |
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Keywords: | undecane GC/MS chemical defences gland morphology predation avoidance mechanisms |
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