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Volatile compounds released by disturbed and undisturbed adults of Anchomenus dorsalis (Coleoptera, Carabidae, Platynini) and structure of the pygidial gland

  • Autori: Bonacci, T; Brandmayr, P; Zetto, T; Perrotta, ID; Guarino, S; Peri, E; Colazza, S
  • Anno di pubblicazione: 2011
  • Tipologia: Articolo in rivista (Articolo in rivista)
  • Parole Chiave: undecane, GC/MS, chemical defences, gland morphology, predation avoidance mechanisms
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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 signifi cantly more undecane was released by disturbed adults compared to undisturbed beetles. Th e pygidial glands of adults of A. 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 (eff erent duct) through which the secretion is discharged. Th e function of the pygidial glands and the possible role played by undecane as a defensive allomone and/or chemical signalling molecule are discussed.