Fruit odor discrimination and sympatric host race formation in Rhagoletis

Charles Linn, Jeffrey L. Feder, Satoshi Nojima, Hattie R. Dambroski, Stewart H. Berlocher, Wendell Roelofs

Research output: Contribution to journalArticlepeer-review


Rhagoletis pomonella is a model for incipient sympatric speciation (divergence without geographic isolation) by host-plant shifts. Here, we show that historically derived apple- and ancestral hawthorn-infesting host races of the fly use fruit odor as a key olfactory cue to help distinguish between their respective plants. In flight-tunnel assays and field tests, apple and hawthorn flies preferentially oriented to, and were captured with, chemical blends of their natal fruit volatiles. Because R. pomonella rendezvous on or near the unabscised fruit of their hosts to mate, the behavioral preference for apple vs. hawthorn fruit odor translates directly into premating reproductive isolation between the fly races. We have therefore identified a key and recently evolved (<150 years) mechanism responsible for host choice in R. pomonella bearing directly on sympatric host race formation and speciation.

Original languageEnglish (US)
Pages (from-to)11490-11493
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number20
StatePublished - Sep 30 2003

ASJC Scopus subject areas

  • General


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