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

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.

10aAuditory ecology10abioacoustics10aneuroanatomy10aRegression10aVestigialization1 aLehmann, Gerlind, U.C.1 aStrauß, Johannes1 aLakes-Harlan, Reinhard uhttp://link.springer.com/10.1007/s00359-007-0209-y02685nas a2200229 4500008004100000245008600041210006900127260001600196300001400212490000700226520197600233653002502209653001902234653002502253653002002278653002202298653001902320100001602339700002002355700002702375856005302402 2014 eng d00aSensory evolution of hearing in tettigoniids with differing communication systems0 aSensory evolution of hearing in tettigoniids with differing comm cJan-01-2014 a200 - 2130 v273 a

In Tettigoniidae (Orthoptera: Ensifera), hearing organs are essential in mate detection. Male tettigoniids usually produce calling songs by tegminal stridu- lation, whereas females approach the males phonotactically. This unidirec- tional communication system is the most common one among tettigoniids. In several tettigoniid lineages, females have evolved acoustic replies to the male calling song which constitutes a bidirectional communication system. The genus Poecilimon (Tettigoniidae: Phaneropterinae) is of special interest because the ancestral state of bidirectional communication, with calling males and responding females, has been reversed repeatedly to unidirec- tional communication. Acoustic communication is mediated by hearing organs that are adapted to the conspecific signals. Therefore, we analyse the auditory system in the Tettigoniidae genus Poecilimon for functional adapta- tions in three characteristics: (i) dimension of sound-receiving structures (tympanum and acoustic spiracle), (ii) number of auditory sensilla and (iii) hearing sensitivity. Profound differences in the auditory system correlate with uni- or bidirectional communication. Among the sound-receiving structures, the tympana scale with body size, whereas the acoustic spiracle, the major sound input structure, was drastically reduced in unidirectional communicating species. In the unidirectional P. ampliatus group, auditory sensilla are severely reduced in numbers, but not in the unidirectional P. propinquus group. Within the P. ampliatus group, the number of auditory sensilla is further reduced in P. intermedius which lost acoustic signalling due to parthenogenesis. The auditory sensitivity correlated with the size of the acoustic spiracle, as hearing sensitivity was better with larger spiracles, espe- cially in the ultrasonic range. Our results show a significant reduction in auditory structures, shaped by the differing sex roles during mate detection.

10aanimal communication10ainsect hearing10aregressive evolution10asensory ecology10asensory evolution10atympanal organ1 aStrauß, J.1 aLehmann, A., W.1 aLehmann, Gerlind, U.C. uhttp://doi.wiley.com/10.1111/jeb.2014.27.issue-102299nas a2200241 4500008004100000245018000041210006900221260001600290300001400306490000700320520144700327653001701774653002501791653002401816653001301840653002001853100002001873700002601893700002201919700003601941700002701977856005302004 2014 eng d00aChromosomal diversification in the flightless Western Mediterranean bushcricket genus Odontura (Orthoptera: Tettigoniidae: Phaneropterinae) inferred from molecular data0 aChromosomal diversification in the flightless Western Mediterran cJan-05-2014 a109 - 1180 v523 a

We used molecular characters to infer the phylogenetic position of the Western Mediterranean bushcricket genus Odontura and to trace its high karyotype diversity. Analysis of 1391 base pairs of two mitochondrial genes (COI and ND1) and one nuclear sequence (ITS2) was conducted. Phylogenetic topologies were estimated using maximum parsimony, maximum likelihood and likelihood-based Bayesian inference. The genus Odontura is a phylogenetic outlier in respect of all other European Phaneropterinae genera and has been proposed to have originated from a hitherto unknown ancestor. Our results support the monophyly of the genus Odontura and the recognition of two subgenera: Odontura and Odonturella. We found that both Sicilian taxa of the subgenus Odontura have a completely identical morphology and song patterns. Combining these results, we proposed that both should be treated as subspecies: O. (Odontura) stenoxypha stenoxypha and O. (O.) st. arcuata. Bioacoustic data also proved to support independent markers, with song characteristics reflecting the molecular topology. Mapping the karyotypic characters onto the phylogenetic tree allows a reconstruction of the directions and transitional stages of chromosome differentiation. The number of autosomes within the genus Odontura ranges from 26 to 30. In addition to the ancestral X0 sex determination mechanism, neo-XY and neo-X1X2Y sex chromosomes have evolved independently.

10abioacoustics10achromosome evolution10amolecular phylogeny10aOdontura10aPhaneropterinae1 aGrzywacz, Beata1 aHeller, Klaus-Gerhard1 aLehmann, Arne, W.1 aWarchałowska-Śliwa, Elżbieta1 aLehmann, Gerlind, U.C. uhttp://doi.wiley.com/10.1111/jzs.2014.52.issue-2