Divergence in the calling songs between sympatric and allopatric populations of the southern wood cricket Gryllus fultoni (Orthoptera: Gryllidae)

Y. Jang, H. C. Gerhardt

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44 Scopus citations

Abstract

In the eastern United States the wood cricket Gryllus fultoni (Orthoptera: Gryllidae) occurs in sympatry with G. vernalis in an area between eastern Kansas and west of the Appalachian Mountains. Calling songs were recorded from 13 sympatric and allopatric localities. Both field and laboratory recordings showed that chirp rate (CR) and pulse rate (PR) overlapped extensively between allopatric populations of G. fultoni and sympatric populations of G. vernalis; by contrast, there was little or no overlap in these variables between sympatric populations of these two species. Divergence in PR and CR between the two species was thus greater in areas of sympatry than in areas of allopatry. Our field and laboratory studies of G. fultoni calling songs thus demonstrate the pattern expected of character displacement and support the genetic assumptions of this hypothesis. Other possible explanations for the sympatric divergence such as ecological character displacement and clinal variation are discussed.

Original languageEnglish
Pages (from-to)459-472
Number of pages14
JournalJournal of Evolutionary Biology
Volume19
Issue number2
DOIs
StatePublished - Mar 2006

Keywords

  • Allopatry
  • Calling song
  • Clinal variation
  • Developmental effect
  • Ecological character displacement
  • Geographical variation
  • Gryllus fultoni
  • Gryllus vernalis
  • Reproductive character displacement
  • Reproductive isolation
  • Sympatry

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