01672nas a2200181   4500008004100000245012300041210006900164520103500233653002101268653001701289653001701306653001501323653002101338100002701359700002201386700002701408856005501435       2007                        eng d00aListening when there is no sexual signalling? Maintenance of hearing in the asexual bushcricket Poecilimon intermedius0 aListening when there is no sexual signalling Maintenance of hear3 a<p>Unisexual reproduction is a widespread phenomenon in invertebrates and lower vertebrates. If a former sexual reproducing species becomes parthe- nogenetic, we expect traits that were subject to sexual selection to diminish. The bushcricket Poecilimon intermedius is one of the few insect species with obli- gate but diploid parthenogenetic reproduction. We contrasted characters that are involved in mating in a sexually sibling species with the identical structures in the parthenogenetic P. intermedius. Central for sexual communication are male songs, while receptive females approach the males phonotactically. Com- pared to its sister-species P. ampliatus, the morphology of the hearing organs (acoustic spiracle, crista acustica) and the function of hearing (acoustic threshold) are reduced in P. intermedius. Nonetheless, hearing is clearly maintained in the parthenogenetic females. Natural selection by acoustic hunting bats, pleiotropy or a developmental trap may explain the well main- tained hearing function.</p>
10aAuditory ecology10abioacoustics10aneuroanatomy10aRegression10aVestigialization1 aLehmann, Gerlind, U.C.1 aStrauß, Johannes1 aLakes-Harlan, Reinhard  uhttp://link.springer.com/10.1007/s00359-007-0209-y01830nas a2200241   4500008004100000245014800041210006900189260001600258300001400274490000700288520098700295653001701282653001501299653001801314653001301332100002201345700001701367700002801384700002601412700002401438700002801462856009801490       2007                        eng d00aStridulatory file and calling song of two populations of the tropical bush cricket Eneoptera surinamensis (Orthoptera, Gryllidae, Eneopterinae)0 aStridulatory file and calling song of two populations of the tro  cJan-12-2007  a461 - 4650 v973 a<p>This study characterizes the calling song and ultramorphology of the stridulatory file of two geographically isolated populations of the tropical bush cricket Eneoptera surinamensis (De Geer, 1773) from city of Foz do Igua&ccedil;u, state of Paran&aacute;, and town of Rio Claro, state of S&atilde;o Paulo, Brazil, distant 1,000 Km from each other. The teeth are shell-shaped, the larger ones are dis tributed in the medium region of the file, decreasing gradually in size towards the edges. Specimens from Foz do Igua&ccedil;u have a file with 82 &plusmn; 9.8 teeth, length=1.89 mm &plusmn; 0.15 with 43.76 &plusmn; 5.94 teeth per mm (n=15). Specimens from Rio Claro present a file with 87 &plusmn; 9.81, length=1.9 6 &plusmn; 0.19 mm with 44.52 &plusmn; 4.61 teeth per mm (n=15). Statistical differences found between the two populations are not significant. The calling song is an uninterrupted trill that alternates two sets of notes distinct for its temporal features.</p>
10abioacoustics10aGrylloidea10apars stridens10asonogram1 aMiyoshi, Akio, R.1 aZefa, Edison1 aMartins, Luciano, de P.1 aDias, Pedro, G. B. S.1 aDrehmer, César, J.1 aDornelles, José, E. F.  uhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212007000400016&lng=en&tlng=en