Sex-Pairing Pheromones in Three Sympatric Neotropical Termite Species (Termitidae: Syntermitinae)

0490860 - ÚOCHB 2019 RIV US eng J - Článek v odborném periodiku
Dolejšová, Klára - Křivánek, Jan - Kalinová, Blanka - Hadravová, Romana - Kyjaková, Pavlína - Hanus, Robert
Sex-Pairing Pheromones in Three Sympatric Neotropical Termite Species (Termitidae: Syntermitinae).
Journal of Chemical Ecology. Roč. 44, č. 6 (2018), s. 534-546. ISSN 0098-0331. E-ISSN 1573-1561
Grant ostatní: AV ČR(CZ) FNRS-17-02
Program: Bilaterální spolupráce
Institucionální podpora: RVO:61388963
Klíčová slova: Silvestritermes minutus * Silvestritermes heyeri * Embiratermes neotenicus * sex-pairing pheromones * tergal glands * Syntermitinae
Obor OECD: Analytical chemistry
Impakt faktor: 2.447, rok: 2018

Termite colonies are almost always founded by a pair of winged dispersers, in spite of the high costs and low success rates inherent in independent colony foundation. The dispersal flights of imagoes from natal colonies are followed by mate search, mediated by sex-pairing pheromones. Here, we studied the chemistry of sex-pairing pheromones and the related aspects of mate search in winged imagoes of two facultatively parthenogenetic species, Embiratermes neotenicus and Silvestritermes minutus, and an additional species from the same subfamily, Silvestritermes heyeri. All three species are widespread in the Neotropics, including the rainforests of French Guiana. After the dispersal flight and spontaneous loss of wings, females expose their hypertrophied tergal glands situated under abdominal tergites VIII - X. The females are attractive to males and, upon direct contact, the two sexes form characteristic tandems. Chemical analyses indicated that the females secrete species-specific combinations of unbranched, unsaturated C-12 primary alcohols from the tergal glands, (3Z,6Z,8E)-dodeca-3,6,8-trien-1-ol (approx. 200 pg per female) and (3Z)-dodec-3-enol (185 pg) in E. neotenicus, (3Z,6Z)-dodeca-3,6-dien-1-ol (3500 pg) in S. heyeri, and (3Z,6Z)-dodeca-3,6-dien-1-ol (300 pg) and (3Z)-dodec-3-enol (50 pg) in S. minutus. (3Z,6Z,8E)-Dodeca-3,6,8-trien-1-ol and (3Z,6Z)-dodeca-3,6-dien-1-ol act as major pheromone components in the respective species and mimic the function of female tergal gland extracts in electrophysiological and behavioral experiments. Biologically relevant amounts of the third compound, (3Z)-dodec-3-enol, elicited non-significant reactions in males of E. neotenicus and S. minutus, and slight synergistic effects in males of S. minutus when tested in combination with the major component.
Trvalý link: http://hdl.handle.net/11104/0284993