( a Recherche Agronomique from the Centr...)Another Sexual Attraction is Possible ...,Health

a Recherche Agronomique, from the Centre National de la Recherche Scientifique and from the University of Toulouse show that, while pheromones are probably used for meeting, they may not be used for mating per se. Performing crosses and backcrosses between different pheromone races of this moth, they obtained groups of individuals sharing the same pheromone type but differing in their overall genetic relatedness with the "pure" races, and, conversely, groups of individuals sharing a very similar genetic background but using different pheromones. The former were expected all to show similar mating performances with a group of pure-race individuals - but they didn't. The latter were expected to show differences in mating succes s with pure-race individuals - but, again, they didn't. Therefore, overall relatedness rather than pheromone type seems a good predictor of the ability to mate, at least within this species studied here.

These results suggest that the role of pheromone divergence in speciation may not be quite as strong as previously thought - at least within this model species - since another recognition system seems to coexist and constitute a powerful mating barrier. Why, then, don't the corn borer Capulets and Montagues mate more often" So far, the researchers can only dream of their next findings....


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