@article {57610, title = {Noisy neighbours among the selfish herd: a critical song distance mediates mate recognition within cicada emergences (Hemiptera: Cicadidae)Abstract}, year = {2019}, abstract = {

Cicadas probably experience mate recognition challenges as a result of the densities that may occur during adult emergence events, and in Okanagana, the most speciose genus of North American cicadas, high alpha diversities during protoperiodical emergences will exacerbate the mate recognition problem. Using 227 songs from 23 taxa, a linear plateau model regressed recognition potential, estimated from linear discriminant analysis, against song distance, revealing a critical song distance of 0.728 standard deviations in z-transformed song parameter space accompanied by a recognition of 91.6\%. Based on detailed examination of museum specimen localities, field observations and habitat, taxa were classified as sympatric or allopatric. Sympatric species were separated by song distances that were significantly greater than this critical distance. As expected for mate recognition characters, little within-species variance was observed in the songs of most species, and the relationship between increases in syllable rate and improved recognition was one of diminishing returns. For several taxa that sang with extreme syllable rates of high variance, a mate recognition \– sexual selection continuum is proposed. Along this continuum rapid rates simultaneously prevent mate recognition errors while signalling male quality to females.

}, keywords = {California, female preference, indicator trait, linear discriminant function, linear plateau analysis, Okanagana, receiver bias, sexual selection}, doi = {10.1093/biolinnean/blz132}, url = {https://academic.oup.com/biolinnean/advance-article/doi/10.1093/biolinnean/blz132/5602697}, author = {Chatfield-Taylor, Will and Jeffrey A. Cole} } @article {47332, title = {Clinal variation explains taxonomic discrepancy in the calling songs of shield-back katydids (Orthoptera: Tettigoniidae: Tettigoniinae: Aglaothorax)}, journal = {Biological Journal of the Linnean Society}, volume = {101}, year = {2010}, month = {Jan-12-2010}, pages = {910 - 921}, abstract = {

Understanding the relationship between mating trait evolution and speciation requires data from a variety of taxa. I analysed the calling songs of the shield-back katydid genus Aglaothorax, which represents a little-known lineage of acoustic insects. Field-collected males of all described species and most subspecies were recorded under controlled laboratory conditions. Discriminant analysis was 90.5\% successful in separating song types, but the song types thus delineated did not correspond to currently recognized taxa as defined by morphology. The discrepancy is caused by two species, Aglaothorax morsei and Aglaothorax longipennis, the songs of which vary in a cline across the Transverse Ranges and the Los Angeles Basin of southern California. From west to east, pulse rate and duty cycle decrease and interpulse interval increases. Selection for species recognition at a contact zone, sexual selection and interactions between signals and the environment are considered as causes of the cline.

}, keywords = {bioacoustics, California, cline, discriminant analysis, speciation, transverse ranges}, doi = {10.1111/bij.2010.101.issue-410.1111/j.1095-8312.2010.01532.x}, url = {http://doi.wiley.com/10.1111/bij.2010.101.issue-4https://academic.oup.com/biolinnean/article-lookup/doi/10.1111/j.1095-8312.2010.01532.xhttps://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111\%2Fj.1095-8312.2010.01532.x}, author = {Jeffrey A. Cole} } @article {17268, title = {A new species of Megatibicen endemic to Mescalero-Monahans shinnery sands (Hemiptera: Auchenorrhyncha: Cicadidae)}, journal = {Zootaxa}, volume = {4236}, year = {2017}, month = {Nov-02-2018}, pages = {553}, abstract = {

Megatibicen harenosus sp. n. is described from the Mescalero-Monahans shinnery sands of New Mexico and Texas, U.S.A. The new species is diagnosed from similar species, especially M. tremulus which it resembles closely, by male genital morphology, color pattern, calling song, and ecology. Seven characters from the male calling song are described from analysis of field recordings, of which all four temporal song characters are significantly different from M. tremulus. With one of the most southwestern distribution of any Megatibicen species, M. harenosus is a new addition to the rich, endemic, and understudied Mescalero-Monahans shinnery sands biota. The possibility that M. harenosus and M. tremulus are sister species is raised. The ecological, biological, and evolutionary species concepts support species status for M. harenosus, and an hypothesis of peripatric speciation in peripheral isolation is advanced.

}, keywords = {bioacoustics, endemic, evolutionary species concept, peripatric speciation}, issn = {1175-5326}, doi = {10.11646/zootaxa.4236.310.11646/zootaxa.4236.3.9}, url = {http://biotaxa.org/Zootaxa/issue/view/zootaxa.4236.3}, author = {Jeffrey A. Cole} }