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PHEROMONAL SPECIFICITY OF SOUTHEASTERN IPS PINE BARK BEETLES REFLECTS PHYLOGENETIC DIVERGENCE (COLEOPTERA: SCOLYTIDAE)

Published online by Cambridge University Press:  31 May 2012

Edwin E. Lewis  and
James H. Cane
Edwin E. Lewis
Affiliation:
Department of Entomology and Alabama Agricultural Experiment Station, Auburn University, Auburn, Alabama, USA 36849
James H. Cane
Affiliation:
Department of Entomology and Alabama Agricultural Experiment Station, Auburn University, Auburn, Alabama, USA 36849
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Abstract

The attractiveness of the aggregation pheromones produced by males of four species of Ips pine bark beetles was assessed to determine whether competition for a private communication channel among sympatric species or phylogenetic divergence better explains the current pheromonal specificity among the species. In the southeastern United States, Ips calligraphus (Germar), I. grandicollis (Eichhoff), and I. avulsus (LeConte) are broadly sympatric and they represent three different species groups. A member of the I. grandicollis species group, I. confusus (LeConte), is allopatric to the other three and native to the southwestern United States. Only the pair of species from the same species group were pheromonally cross-attractive. Broadly allopatric species from dissimilar species groups were not cross-attractive. Thus, their pheromonal specificity paralleled their taxonomic relationship regardless of geographic overlap and competitive interaction.

Résumé

La puissance des phéromones d’assemblage produites par les mâles de quatre espèces de scolyte du pin du genre Ips a été évaluée pour déterminer si la spécificité des phéromones parmi les espèces pourrait être mieux expliquée par une compétition pour une voie de communication privée parmi les espèces sympatriques ou par une divergence phylogénétique. Au sud-est des États-Unis, Ips calligraphus (Germar), I. grandicollis (Eichhoff) et I. avulsus (LeConte) sont généralement sympatriques et ils représentent trois groupes d’espèces différents. Un membre du groupe-espèce I. grandicollis, I. confusus (LeConte), est allopatrique aux trois autres espèces et indigène aux sud-ouest des États-Unis. Seules les deux espèces du même groupe-espèce ont été attirées par toutes les phéromones. Les espèces de groupes-espèce non-semblables, généralement allopatriques, n’ont pas été attirées par toutes les phéromones. Ainsi, la spécificité des phéromones s’est développée en parallèle avec les liens taxinomiques, en dépit de l’empiétement géographique et de l’interaction compétitive.

Type
Research Article
Information
The Canadian Entomologist , Volume 122 , Issue 6 , December 1990 , pp. 1235 - 1238
Copyright
Copyright © Entomological Society of Canada 1990

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