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Science 10 November 1978:
Vol. 202. no. 4368, pp. 644 - 645
DOI: 10.1126/science.202.4368.644
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Articles

Competition Among Courting Male Moths: Male-to-Male Inhibitory Pheromone

K. HIRAI 1, H. H. SHOREY 1, and LYLE K. GASTON 1

1 Division of Toxicology and Physiology, Department of Entomology, University of California, Riverside 92521

The behavioral function of a pheromone released by males of the army-worm moth Pseudaletia unipuncta was investigated both in laboratory wind-tunnel experiments and in experiments with moth-baited traps in the field. Such male moth scents have been thought to act at close range as sexual stimulants for females of the same species. However, the only obvious effect of the P. unipuncta male pheromone was upon other males, decreasing their tendency to approach sexually receptive, pheromone-releasing females and to exhibit copulatory behavior when near those females. The adaptive significance of the male pheromone may be related to the increased reproductive efficiency that results if multiple males are prevented from competing for a single female.

Submitted on February 17, 1978
Revised on July 6, 1978


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