Premium
CALLING SONG DISPLACEMENT IN A ZONE OF OVERLAP AND HYBRIDIZATION
Author(s) -
Benedix J. H.,
Howard Daniel J.
Publication year - 1991
Publication title -
evolution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.84
H-Index - 199
eISSN - 1558-5646
pISSN - 0014-3820
DOI - 10.1111/j.1558-5646.1991.tb02685.x
Subject(s) - character displacement , biology , sympatry , hybrid zone , transect , orthoptera , displacement (psychology) , reproductive isolation , zoology , ecology , sympatric speciation , gene flow , demography , psychology , biochemistry , population , sociology , gene , psychotherapist , genetic variation
The ground crickets Allonemobius fasciatus and A. socius meet in a mosaic zone of overlap and hybridization stretching from the East Coast to at least Illinois. To test whether male calling song differences were enhanced in sympatry, we analyzed the songs of crickets from inside and outside the zone of overlap along two transects. No evidence of calling song displacement was found in A. socius males from populations within the zone of overlap. On the other hand, A. fasciatus displayed calling song displacement in three populations. Our results are consistent with the hypothesis that the selective pressure exerted by the challenge from a related species is frequency dependent. While not a conclusive demonstration, the observed shifts in calling song are strongly suggestive of reproductive character displacement.