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The mode of pheromone evolution: evidence from bark beetles
Matthew R E Symonds1, Mark A Elgar
1Department of Zoology, University of Melbourne, VIC 3010, Australia. matthew.symonds@jcu.edu.au
Proceedings. Biological Sciences
|July 17, 2004
Summary
Bark beetle pheromone evolution involves large, sudden shifts in chemical blends, not gradual changes. Closely related species often have significantly different pheromones, supporting saltational evolution theories.
Area of Science:
- Chemical Ecology
- Evolutionary Biology
- Entomology
Background:
- Species-specific pheromone blends are crucial for bark beetle reproduction and aggregation.
- The evolutionary pathways of these pheromone blends remain a subject of scientific debate.
Purpose of the Study:
- To investigate the evolutionary patterns of aggregation pheromones in bark beetles.
- To determine if pheromone evolution aligns with phylogenetic relationships and theoretical predictions.
Main Methods:
- Analyzed aggregation pheromone chemical components from 34 bark beetle species across two genera (Dendroctonus and Ips).
- Compared pheromone blend compositions with the phylogenetic relationships of the studied species.
Main Results:
- Significant differences in pheromone blends were observed between the two genera.
- Within genera, pheromone differences did not consistently follow phylogenetic patterns; closely related species varied as much as distant ones.
- Chemical components within Dendroctonus species showed largely random distribution across the phylogeny, with some suggesting even greater divergence between related species.
Conclusions:
- Pheromone evolution in bark beetles is characterized by large, saltational shifts rather than gradual accumulation of small changes.
- Sibling species can be pheromonally distinct, supporting theoretical models of rapid evolutionary divergence.