01891nas a2200145   4500008004100000022001300041245011400054210006900168260001600237300001400253490000700267520138500274100002001659856006601679       2005                        eng d  a0003347200aDifference in calling song of three field crickets of the genus Teleogryllus: the role in premating isolation0 aDifference in calling song of three field crickets of the genus   cJan-04-2005  a881 - 8890 v693 a<p>Cricket songs are species-specific signals that are important for species recognition. To prove the effectiveness of calling songs in premating isolation, studies need to take into account closely related species distributed sympatrically in nature. I compared the calling songs of three closely related cricket species that inhabit the Japanese archipelago: Teleogryllus yezoemma, T. emma and T. taiwanemma. Teleogryllus emma is widely distributed in the archipelago and overlaps the ranges of T. taiwanemma in the south and T. yezoemma in the north; T. yezoemma and T. taiwanemma are allopatric. I compared three temporal parameters (the long-chirp duration, the interphrase duration and the pulse cycle), a frequency parameter (the dominant frequency) and two structural parameters (the number of pulses in one long chirp and the number of short chirps following one long chirp). In addition, I conducted a two-speaker playback experiment using female T. taiwanemma to test whether they can accurately distinguish conspecific males based on their calling song. The species with partially overlapping ranges had divergent songs that females could distinguish accurately, whereas the allopatric species had similar songs that females could not accurately discriminate. These results suggest that the calling song has an important role as a premating isolation mechanism.</p>
1 aHonda-Sumi, Eri  uhttp://linkinghub.elsevier.com/retrieve/pii/S000334720400380X01693nas a2200205   4500008004100000022001300041245012000054210007100174260001600245300001400261490000800275520099000283653002801273653001801301653003001319653002101349653002901370100002201399856006601421       2017                        eng d  a0003347200aMale–male courtship behaviour, not relatedness, affects the intensity of contest competition in the field cricket0 aMale–male courtship behaviour not relatedness affects the intens  cJan-04-2017  a217 - 2200 v1263 a<p>Males often compete intensely against rival males because access to females is a major factor contrib- uting to their reproductive success. However, there is controversy over whether maleemale competition is weakened when rival males are related, with reduced aggressiveness leading to inclusive fitness benefits. Furthermore, same-sex sexual behaviour is also expected to mitigate maleemale contests. Here, I examined how relatedness, developmental familiarity (i.e. males reared in the same container or not) and same sex sexual behaviour affect the intensity of maleemale competition in wild-caught field crickets, Teleogryllus occipitalis. Relatedness and familiarity had no significant effect on the intensity of maleemale contest behaviour. However, same-sex sexual behaviour did weaken maleemale competi- tion. In conclusion, my results indicate that same-sex sexual behaviour in this cricket has adaptive sig- nificance by mitigating risky maleemale contest behaviour.</p>
10aintrasexual competition10akin selection10asame-sex sexual behaviour10asexual selection10aTeleogryllus occipitalis1 aKuriwada, Takashi  uhttp://linkinghub.elsevier.com/retrieve/pii/S0003347217300465