Abstract
Seventeen species ofIps were laboratory or field tested for the specificity of their response to male-produced aggregating pheromones. In the laboratory, some species appeared not to differentiate among their own pheromones and those of closely related species, whether the pheromones were bioassayed individually or in direct competition. Other species showed strong preference for their own pheromones in competition with those of closely related species, even though they had demonstrated strong attraction to pheromones of the related species. Cross-responsiveness amongI. confusus, I. montanus, andI. paraconfusus, and betweenI. mexicanus andI. concinnus, was confirmed in field tests. Moreover, wildI. paraconfusus females entered the nuptial chambers of males ofI. montanus andI. confusus but not those of the more distantly relatedI. mexicanus. It is hypothesized that specificity of response to aggregating pheromone is important in the maintenance of reproductive isolation among sympatricIps and that the lack of specificity among closely related species enforces the parapatric distributions characteristic of these species.
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Study supported in part by the National Science Foundation (GB 2972), U.S. Forest Service (No. 5), California Division of Forestry, T. B. Walker and Surdna Foundations, and various forest industries.
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Lanier, G.N., Wood, D.L. Specificity of response to pheromones in the genusIps (Coleoptera: Scolytidae). J Chem Ecol 1, 9–23 (1975). https://doi.org/10.1007/BF00987717
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DOI: https://doi.org/10.1007/BF00987717