02531nas a2200133 4500008004100000245007900041210006900120520206600189100002902255700002302284700001902307700001802326856005302344 2008 eng d00aMatched Filters, Mate Choice and the Evolution of Sexually Selected Traits0 aMatched Filters Mate Choice and the Evolution of Sexually Select3 a

Background: Fundamental for understanding the evolution of communication systems is both the variation in a signal and how this affects the behavior of receivers, as well as variation in preference functions of receivers, and how this affects the variability of the signal. However, individual differences in female preference functions and their proximate causation have rarely been studied.

Methodology/Principal Findings: Calling songs of male field crickets represent secondary sexual characters and are subject to sexual selection by female choice. Following predictions from the ‘‘matched filter hypothesis’’ we studied the tuning of an identified interneuron in a field cricket, known for its function in phonotaxis, and correlated this with the preference of the same females in two-choice trials. Females vary in their neuronal frequency tuning, which strongly predicts the preference in a choice situation between two songs differing in carrier frequency. A second ‘‘matched filter’’ exists in directional hearing, where reliable cues for sound localization occur only in a narrow frequency range. There is a strong correlation between the directional tuning and the behavioural preference in no-choice tests. This second ‘‘matched filter’’ also varies widely in females, and surprisingly, differs on average by 400 Hz from the neuronal frequency tuning.

Conclusions/Significance: Our findings on the mismatch of the two ‘‘matched filters’’ would suggest that the difference in these two filters appears to be caused by their evolutionary history, and the different trade-offs which exist between sound emission, transmission and detection, as well as directional hearing under specific ecological settings. The mismatched filter situation may ultimately explain the maintenance of considerable variation in the carrier frequency of the male signal despite stabilizing selection.

1 aKostarakos, Konstantinos1 aHartbauer, Manfred1 aRömer, Heiner1 aTregenza, Tom uhttps://dx.plos.org/10.1371/journal.pone.000300501626nas a2200181 4500008004100000245009300041210006900134300001000203490000800213520106600221653001701287653001301304653001601317653001601333100002701349700002201376856004601398 2008 eng d00aBioacoustic studies on some cricket species (Insecta:Orthoptera: Gryllidae) from Romania0 aBioacoustic studies on some cricket species InsectaOrthoptera Gr a57-640 vLIV3 a

There are 9 cricket species known from Romania belonging to the family Gryllidae. The ordinary stridulation of 7 species of those has been analyzed in this paper. The species belonging to the subfamily Gryllinae: Gryllus campestris, Acheta domestica, Melanogryllus desertus, Modicogryllus frontalis and Modicogryllus truncatus stridulate especially in the afternoon and in the evening, rarely during daytime, meanwhile the species Pteronemobius heydenii from the subfamily Nemobiinae stridulate only during daytime and especially by sunny weather, while the only species belonging to the subfamily Oecanthinae from our country fauna, Oecanthus pellucens, stridulate at night, very rarely during daytime (mostly in autumn). Details of the stridulatory vein and identification criteria for the studied cricket species are presented in this paper; also we have annalysed the spectrograms and the oscillograms for the ordinary stridulation of the 7 species. The species Modicogryllus truncatus, collected at Mărăşeşti, is a new report for Moldavia.

10abioacoustics10acrickets10aoscillogram10aspectrogram1 aIorgu, Ionuț, Ștefan1 aMustata, Gheorghe uhttps://bio.acousti.ca/zh-hant/node/47792