Pheromone Concentration as a Mechanism for Reproductive Isolation between Two Lepidopterous Species

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Science  02 Feb 1973:
Vol. 179, Issue 4072, pp. 487-488
DOI: 10.1126/science.179.4072.487


Pheromone-releasing females of the closely related noctuid moths Trichoplusia ni and Autographa californica attract mainly males of their own species. Sex-pheromone-concentration specificity appears to be an important reproductive isolating mechanism for these two species. Apparently, both species utilize the same pheromone, cis-7-dodecenyl acetate, for mating communication, but T. ni utilizes a higher level than does A. californica. Traps releasing amounts of cis-7-dodecenyl acetate that are highly attractive for males of one of the species catch very few males of the other species.