Cricket Song in Sympatry: Species Specificity of Song without Reproductive Character Displacement in Gryllus rubens

Previousworkwith the cryptic sister species pair of Þeld crickets,Gryllus texensisCade & Otte and Gryllus rubens Scudder, has implicated sexual selection in the speciation process. That study examined reproductive character displacement (RCD) in male song and female preference for song in G. texensis. No evidence of RCD was found. Here, we provide a similar analysis of RCD in G. rubens song and examine the songs of both species from areas of sympatry in an effort to document the species-speciÞcityof song in sympatry and to look for individualswith songs indicativeofF1hybrid status. We 1) Þnd no evidence for RCD in G. rubens song, 2) demonstrate the distinctness of song in sympatry, and 3) document the rarity of songs typical of F1 hybrids.