@article {58326, title = {Platycleis galvagnii, a peculiar new bushcricket from Sardinia (Italy) (Insecta, Orthoptera, Tettigoniidae)}, journal = {Zootaxa}, volume = {2784}, year = {2011}, month = {Jul-03-2011}, pages = {51}, abstract = {

Platycleis galvagnii n. sp. from Sardinia (Italy) is described. In general habitus the new taxon is close to Platycleis sensu strictu, albeit very small in size. When looking at other characters the species does not seem to fit within one of the groups recognised within Platycleis s.l., but for the moment the species is placed in Platycleis s.s.. The species is characterised by a range of morphological and bioacoustic characters. Its real affiliations with other species within the Platycleis complex need to be established further. For the moment the species is known only from the type locality, Gennargentu mountain in the central part of Sardinia.

}, keywords = {bioacoustics, Gennargentu, Italia, Orthoptera, Platycleis galvagnii n. sp., Sardinia}, issn = {1175-5326}, doi = {10.11646/zootaxa.2784.110.11646/zootaxa.2784.1.5}, url = {https://biotaxa.org/Zootaxa/issue/view/zootaxa.2784.1https://biotaxa.org/Zootaxa/article/view/zootaxa.2784.1.5https://biotaxa.org/Zootaxa/article/viewFile/45485/39233}, author = {FONTANA, PAOLO and BUZZETTI, FILIPPO M. and KLEUKERS, ROY M. J. C. and OD{\'E}, BAUDEWIJN} } @article {57946, title = {No evidence for DPOAEs in the mechanical motion of the locust tympanum}, year = {2011}, abstract = {

Distortion-product otoacoustic emissions (DPOAEs) are present in non-linear hearing organs, and for low-intensity sounds are a by-product of active processes. In vertebrate ears they are considered to be due to hair cell amplification of sound in the cochlea; however, certain animals lacking a cochlea and hair cells are also reported to be capable of DPOAEs. In the Insecta, DPOAEs have been recorded from the locust auditory organ. However, the site of generation of these DPOAEs and the physiological mechanisms causing their presence in the locust ear are not yet understood, despite there being a number of potential places in the tympanal organ that could be capable of generating DPOAEs. This study aimed to record locust tympanal membrane vibration using a laser Doppler vibrometer in order to identify a distinct place of DPOAE generation on the membrane. Two species of locust were investigated over a range of frequencies and levels of acoustic stimulus, mirroring earlier acoustic recording studies; however, the current experiments were carried out in an open acoustic system. The laser measurements did not find any evidence of mechanical motion on the tympanal membrane related to the expected DPOAE frequencies. The results of the current study therefore could not confirm the presence of DPOAEs in the locust ear through the mechanics of the tympanal membrane. Experiments were also carried out to test how membrane behaviour altered when the animals were in a state of hypoxia, as this was previously found to decrease DPOAE magnitude, suggesting a metabolic sensitivity. However, hypoxia did not have any significant effect on the membrane mechanics. The location of the mechanical generation of DPOAEs in the locust\’s ear, and
therefore the basis for the related physiological mechanisms, thus remains unknown.

}, keywords = {bioacoustics, distortion-product otoacoustic emissions, hearing, laser Doppler vibrometry, locust, tympanum}, doi = {10.1242/jeb.056465}, url = {http://jeb.biologists.org/cgi/doi/10.1242/jeb.056465https://syndication.highwire.org/content/doi/10.1242/jeb.056465}, author = {Moir, H. M. and Joseph Curt Jackson and James F.C. Windmill} } @article {47338, title = {Do male field crickets, Gryllus pennsylvanicus, signal their age?}, journal = {Animal Behaviour}, volume = {81}, year = {2011}, month = {Jan-01-2011}, pages = {185 - 194}, abstract = {

Older males are often reported to have higher mating success than younger males. To the extent that male quality and survival are positively correlated, this observation raises the possibility that females use male signals to assess age and thus quality. I tested this hypothesis in the fall field cricket, Gryllus pennsylvanicus, a species in which females are known to prefer older males, and males call to attract females. Tests were both longitudinal (males recorded early and late in life) and cross-sectional (males recorded once, each at different ages). I measured a variety of temporal and spectral calling song parameters and tested the predictions that: 1) calling song changes with age, and 2) variation in calling song correlates with variation in age. I found significant changes with increased age: calls showed decreased pulse period, decreased pulse duration, decreased pulse peak frequency, more pulses per chirp and increased pulse period variability. Although pulse period and pulse duration were negatively correlated with male age in bivariate correlations, canonical correlation failed to detect any significant relationship between male age and any linear combination of song parameters. I also measured a number of male body size traits and found that the majority of information in male song appears to be related to body size. I discuss the results in relation to the auditory sensitivity of G. pennsylvanicus, and suggest a simple mechanism that explains both female preference for older males and female discrimination against heterospecific males.

}, keywords = {age-based indicator mechanism, bioacoustics, calling song, Gryllinae, older males, Orthoptera survival}, issn = {00033472}, doi = {10.1016/j.anbehav.2010.09.032}, url = {http://linkinghub.elsevier.com/retrieve/pii/S000334721000401X}, author = {Judge, Kevin A.} } @article {47331, title = {Contribution to the taxonomy of Gryllus Linnaeus, 1758 in South America: Part I: Redescription of Gryllus argentinus Saussure, 1874 (Orthoptera, Grylloidea, Gryllidae)}, journal = {Entomological Science}, volume = {14}, year = {2011}, month = {Jan-01-2011}, pages = {87 - 93}, abstract = {

The genus Gryllus includes 82 described species that occur in America from Canada to Argentina as well as in several areas of Africa, Europe and Asia. There are 12 species in South America, which were described in the nineteenth century based on a small number of samples and inconsistent characters such as body coloration and external morphology. The aim of this article is to redescribe Gryllus argentinus Saussure, 1874 collected in the urban areas of Pelotas, Cap\ão do Le\ão and Rio Grande, in the state of Rio Grande do Sul, southern Brazil, highlighting phallic sclerites, calling song and body morphometry. We designate the lectotype male, provide a combination of diagnostic characteristics and discuss the taxonomic situation of South American Gryllus species.

}, keywords = {bioacoustics, Brazil, cricket, genitalia, insects, pars stridens}, doi = {10.1111/ens.2011.14.issue-110.1111/j.1479-8298.2010.00412.x}, url = {http://doi.wiley.com/10.1111/ens.2011.14.issue-1}, author = {Luciano de P. Martins and Zefa, Edison} }