Search for species-specific mating signal in courtship songs of sympatric sibling species, Drosophila ananassae and D. pallidosa

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Author(s)

Abstract

Sexual isolation is one of the most important mechanisms that may lead to speciation. <i>Drosophila ananassae</i> and <i>D. pallidosa</i> are useful for the study of sexual isolation, because of their sympatric distribution and no postmating isolation between them. Courtship songs are considered to play a crucial role in sexual isolation between <i>D. ananassae</i> and <i>D. pallidosa</i>. We recorded and analyzed male courtship songs of <i>D. ananassae</i> and <i>D. pallidosa</i> for eight and four geographical strains, respectively. Courtship behaviors of the two species were consistent with those previously described, however, male's middle leg shaking, which had not before been described, was observed in both species. Males sing by wing vibration only during courtship. Their song oscillograms were distinct between species, but those of conspecific strains were very similar, in spite of their different geographical derivation. We found species-specificity in burst length, pulse length, cycle number in a pulse, and frequency spectra of bursts; these results suggest that these song parameters may play a role in mate recognition that enforces their sexual isolation. The specific values of interpulse interval, cycle number in a pulse and intrapulse frequency were involved with the determination of specificity in frequency spectra of bursts. We discussed the possibility that the specific frequency spectra of bursts are recognized by females as the species-specific signal rather than each parameter individually.<br>

Journal

  • Genes & Genetic Systems

    Genes & Genetic Systems 77(2), 97-106, 2002-04-01

    The Genetics Society of Japan

References:  38

Codes

  • NII Article ID (NAID)
    10008639449
  • NII NACSIS-CAT ID (NCID)
    AA11077421
  • Text Lang
    ENG
  • Article Type
    ART
  • ISSN
    13417568
  • NDL Article ID
    6264791
  • NDL Call No.
    Z53-W539
  • Data Source
    CJP  NDL  J-STAGE 
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