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Solid-phase microextraction and cuticular hydrocarbon differences related to reproductive activity in queenless ant Dinoponera quadriceps |
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AbstractWe extracted the cuticular hydrocarbons from live Dinoponera quadriceps ants (10 colonies collected from Brazil) with the solventless solid-phase microextraction (SPME) technique. Gas chromatography of the SPME samples (N = 233 measurements) compared with pentane extracts (N = 10) resulted in similar profiles. Eighty-one compounds belonging to the main long-chain hydrocarbon families were identified by GC-MS. There is no morphologically specialized queen in D. quadriceps and only one aggressively dominant worker (alpha) mates and reproduces in each colony. The alpha ant (N = 26 individuals) always yielded higher amounts and percentages of g-hentriacontene (9-C-31:1) than her sterile nestmates (N = 47). Since SPME is not destructive, it allowed for the repeated extraction of the same individuals, demonstrating that the alpha ant (virgin or mated) always had higher levels of 9-hentriacontene. This difference appears related to ovarian activity and may function as a signal of the alpha's dominance status.
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