Journal of Chemical Ecology

, Volume 13, Issue 6, pp 1419–1430 | Cite as

Chemical basis for asymmetric mating isolation between strains of screwworm fly,Cochliomyia hominivorax

  • L. Hammack


Laboratory mating tests and bioassays for a contact, mating-stimulant pheromone were conducted within and between two strains of the screwworm fly,Cochliomyia hominivorax. No strain or sex difference in pheromone activity occurred at emergence. However, the pheromone activity of females increased with age in one strain but declined in the other. Activity also declined in males of both strains but more steeply than in the females. Thus, sexual dimorphism in pheromone activity developed with age in both strains but to differing degrees. The decline in female pheromone activity was partly compensated for within that strain by a higher male responsiveness to pheromone. Female pheromone activity and mating success were positively correlated. Virgin females and those inseminated 24–48 hr previously were equally stimulatory. It appears that the strain differences arose from selection for reduced pheromone activity during laboratory colonization.

Key words

Screwworm fly Cochliomyia hominivorax Diptera Calliphoridae sex pheromone mating-stimulant pheromone mating behavior 


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Copyright information

© Plenum Publishing Corporation 1987

Authors and Affiliations

  • L. Hammack
    • 1
  1. 1.Agricultural Research Service, U.S. Department of AgricultureMetabolism and Radiation Research LaboratoryFargo

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