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Species overlap, speciation and the evolution of aggregation pheromones in bark beetles
journal contribution
posted on 2004-03-01, 00:00 authored by Matthew SymondsMatthew Symonds, M ElgarTheoretical predictions suggest that species-specific signals used in the attraction of mates should evolve to reduce the risk of mismating and hybridization. These predictions lead to the hypothesis that the signals of spatially overlapping (i.e. sympatric or syntopic) species should differ more substantially than those of non-overlapping species. Earlier studies have tested this prediction for auditory and visual signals. Here we test the hypothesis using olfactory signals, specifically the aggregation pheromones of species from two genera of bark beetles, Dendroctonus and Ips. We found no direct evidence from within these genera regarding the fact that the chemical blends that make up these pheromones differ more substantially in species that overlap in their geographical ranges and/or host-tree use than in allopatric taxa. However, when comparing between genera, the pheromones of overlapping species appear to be more similar than non-overlapping species. We hypothesize that the species of host tree utilized by the beetles may have some influence on their pheromone blends. Additionally, within genera, species that overlap in host use tend to be more closely related than species that use different hosts. These results may provide indirect evidence for an effect of species overlap on the evolution of bark beetle pheromones.
History
Journal
Ecology lettersVolume
7Issue
3Pagination
202 - 212Publisher
Wiley - Blackwell PublishingLocation
Oxford, Eng.Publisher DOI
ISSN
1461-023XeISSN
1461-0248Language
engPublication classification
C1.1 Refereed article in a scholarly journalCopyright notice
2004, Wiley - Blackwell PublishingUsage metrics
Keywords
chemical communicationreinforcementreproductive character displacementScolytidaesignal evolutionsympatrysyntopyScience & TechnologyLife Sciences & BiomedicineEcologyEnvironmental Sciences & EcologySPRUCE PICEA-ABIESCHARACTER DISPLACEMENTGEER COLEOPTERAIPS-TYPOGRAPHUSPINE ENGRAVERATTACKPOPULATIONSEvolutionary BiologyEcology
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