@article {57650, title = {Matched Filters, Mate Choice and the Evolution of Sexually Selected Traits}, year = {2008}, abstract = {

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.

}, doi = {10.1371/journal.pone.000300510.1371/journal.pone.0003005.g00110.1371/journal.pone.0003005.g00210.1371/journal.pone.0003005.g00310.1371/journal.pone.0003005.g00410.1371/journal.pone.0003005.t001}, url = {https://dx.plos.org/10.1371/journal.pone.0003005}, author = {Kostarakos, Konstantinos and Hartbauer, Manfred and Heiner R{\"o}mer}, editor = {Tregenza, Tom} } @article {47812, title = {New data on the "silver-bell cricket" (Orthoptera, Gryllidae), a forgotten and overlooked cricket subject to a high risk of extinction in western Europe}, journal = {Graellsia}, volume = {64}, year = {2008}, month = {Sep-25-20082263}, pages = {171 - 180}, abstract = {

Gryllodinus kerkennensis (Finot, 1893) presents a disjunct distribution in the Southern part of the Western Palearctic from North Africa up to Central Asia inhabiting arid, semidesert or desert land mostly associated with saline soils near water sources of lagoons or river beds depressions. The species was not recorded in Western Europe (Iberian Peninsula) since 1936 and up to now it is currently excluded from all red list books for Orthopteran conservation. In this paper we report a few and localised populations of this cricket in Castilla-La Mancha inhabiting sandy shores of hiper-saline lagoons. We also provide information on its biometrics, phenology, ecology and behaviour including data of all collection specimens of the Museo Nacional de Ciencias Naturales (MNCN). Because of its audible and particular song, we propose campaigns of night listening points to search for this species in other potential sites where it could be present. We believe that this species may be subject to a high risk of extinction in the Iberian Peninsula, and thus in the whole Western Europe. This is because of their restricted populations and the fragility of its specific habitat. We propose an urgent integral protection and the inclusion of the species in the lists of highly endangered invertebrate species.

}, keywords = {arid land, Castilla-La Mancha, disjunct distribution, extinction risk, Gryllodinus kerkennensis, hiper-saline lagoons}, issn = {0367-5041}, doi = {10.3989/graellsia.2008.v64.i210.3989/graellsia.2008.v64.i2.30}, url = {http://graellsia.revistas.csic.es/index.php/graellsia/issue/view/4}, author = {Cordero, P. J. and Llorente, V.} } @article {47792, title = {Bioacoustic studies on some cricket species (Insecta:Orthoptera: Gryllidae) from Romania}, journal = {Analele Ştiinţifice ale Universităţii {\quotedblbase}Al. I. Cuza{\textquotedblright} Iaşi, s. Biologie animală}, volume = {LIV}, year = {2008}, pages = {57-64}, chapter = {57}, abstract = {

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.

}, keywords = {bioacoustics, crickets, oscillogram, spectrogram}, author = {Ionut Stefan Iorgu and Gheorghe Mustata} }