Matched Filters in Insect Audition: Tuning Curves and Beyond

Römer, Heiner

doi:10.1007/978-3-319-25492-0_4

Cited by 13 publications

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“…b). As hearing organs work in a complex sensory environments with signal transmission and filtering and signalling ranges (Römer, , ), any correlations between acoustic signals and hearing organs must be scrutinized for possible indirect correlations and effects. The correlations of call structure with auditory morphology likely are due to an ecological influence on acoustic signalling by populations or habitats, as species with discontinuous calls regularly occur with higher population densities (Greenfield, ).…”

Section: Discussionmentioning

confidence: 99%

Evolutionary diversification of the auditory organ sensilla in Neoconocephalus katydids (Orthoptera: Tettigoniidae) correlates with acoustic signal diversification over phylogenetic relatedness and life history

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Ekschmitt

et al. 2017

J of Evolutionary Biology

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Neoconocephalus Tettigoniidae are a model for the evolution of acoustic signals as male calls have diversified in temporal structure during the radiation of the genus. The call divergence and phylogeny in Neoconocephalus are established, but in tettigoniids in general, accompanying evolutionary changes in hearing organs are not studied. We investigated anatomical changes of the tympanal hearing organs during the evolutionary radiation and divergence of intraspecific acoustic signals. We compared the neuroanatomy of auditory sensilla (crista acustica) from nine Neoconocephalus species for the number of auditory sensilla and the crista acustica length. These parameters were correlated with differences in temporal call features, body size, life histories and different phylogenetic positions. By this, adaptive responses to shifting frequencies of male calls and changes in their temporal patterns can be evaluated against phylogenetic constraints and allometry. All species showed well-developed auditory sensilla, on average 32-35 between species. Crista acustica length and sensillum numbers correlated with body size, but not with phylogenetic position or life history. Statistically significant correlations existed also with specific call patterns: a higher number of auditory sensilla occurred in species with continuous calls or slow pulse rates, and a longer crista acustica occurred in species with double pulses or slow pulse rates. The auditory sensilla show significant differences between species despite their recent radiation, and morphological and ecological similarities. This indicates the responses to natural and sexual selection, including divergence of temporal and spectral signal properties. Phylogenetic constraints are unlikely to limit these changes of the auditory systems.

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Section: Discussionmentioning

confidence: 99%

Evolutionary diversification of the auditory organ sensilla in Neoconocephalus katydids (Orthoptera: Tettigoniidae) correlates with acoustic signal diversification over phylogenetic relatedness and life history

Strauß

Alt

Ekschmitt

et al. 2017

J of Evolutionary Biology

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“…The evolutionary shift from bidirectional to unidirectional communication may depend on the mating success of females in relatively high population densities (P. ampliatus: von Helversen et al 2012), the active distance between the mates, and the effective range of the acoustic signalling system (von Helversen et al 2015). Here, the complexity of the acoustic environment is important as well, including the role of background noise , signal transmission (Römer 2016), and natural selection by predators that may maintain the hearing organs (Lehmann et al 2007). (Kalmring et al 1990.…”

Section: Influence Of the Communication System On The Auditory Systemmentioning

confidence: 99%

“…In the tonotopically ordered CA (see below), the frequency contents of intraspecific calls or bat echolocation calls are processed by the adequately tuned sensilla. This tonotopic organization also allows intensity (distance) analysis (Hennig et al 2004, Stumpner and Nowotny 2014, Römer 2016: further populations of sensilla will get recruited if the stimulus amplitudes increase to levels that also excite sensory neurons tuned to different best frequencies (Höbel and Schul 2007). The recruitment of sensilla for intensity discrimination is well documented for Requena verticalis with 22 auditory sensilla , Römer 2016.…”

mentioning

confidence: 98%

“…This tonotopic organization also allows intensity (distance) analysis (Hennig et al 2004, Stumpner and Nowotny 2014, Römer 2016: further populations of sensilla will get recruited if the stimulus amplitudes increase to levels that also excite sensory neurons tuned to different best frequencies (Höbel and Schul 2007). The recruitment of sensilla for intensity discrimination is well documented for Requena verticalis with 22 auditory sensilla , Römer 2016. With the species-specific number of auditory sensilla and length of the auditory organ, the differences in thresholds extend the dynamic range of the hearing organ, and the number of sensilla can not only influence the accuracy of representing frequency resolution but also of amplitude differences (Römer 2016).…”

mentioning

confidence: 99%

“…The recruitment of sensilla for intensity discrimination is well documented for Requena verticalis with 22 auditory sensilla , Römer 2016. With the species-specific number of auditory sensilla and length of the auditory organ, the differences in thresholds extend the dynamic range of the hearing organ, and the number of sensilla can not only influence the accuracy of representing frequency resolution but also of amplitude differences (Römer 2016).…”

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confidence: 99%

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What determines the number of auditory sensilla in the tympanal hearing organs of Tettigoniidae? Perspectives from comparative neuroanatomy and evolutionary forces

Strauß¹

2019

JOR

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Insects have evolved complex receptor organs for the major sensory modalities. For the sense of hearing, the tympanal organ of Tettigoniidae (bush crickets or katydids) shows remarkable convergence to vertebrate hearing by impedance conversion and tonotopic frequency analysis. The main auditory receptors are scolopidial sensilla in the crista acustica. Morphological studies established that the numbers of auditory sensilla are species-specific. However, the factors determining the specific number of auditory sensilla are not well understood. This review provides an overview of the functional organization of the auditory organ in Tettigoniidae, including the diversification of the crista acustica sensilla, a list of species with the numbers of auditory sensilla, and a discussion of evolutionary forces affecting the number of sensilla in the crista acustica and their sensitivity. While all species of Tettigoniidae studied so far have a crista acustica, the number of sensilla varies on average from 15–116. While the relative differences or divergence in sensillum numbers may be explained by adaptive or regressive changes, it is more difficult to explain a specific number of sensilla in the crista acustica of a specific species (like for the model species Ancistrura nigrovittata, Copiphora gorgonensis, Gampsocleis gratiosa, Mecopoda elongata, Requena verticalis, or Tettigonia viridissima): sexual and natural selection as well as allometric relationships have been identified as key factors influencing the number of sensilla. Sexual selection affects the number of auditory sensilla in the crista acustica by the communication system and call patterns. Further, positive allometric relationships indicate positive selection for certain traits. Loss of selection leads to evolutionary regression of the auditory system and reduced number of auditory sensilla. This diversity in the auditory sensilla can be best addressed by comparative studies reconstructing adaptive or regressive changes in the crista acustica.

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Evolutionarily conserved coding properties favour the neuronal representation of heterospecific signals of a sympatric katydid species

Kostarakos

Römer

2018

J Comp Physiol A

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To function as a mechanism in premating isolation, the divergent and species-specific calling songs of acoustic insects must be reliably processed by the afferent auditory pathway of receivers. Here, we analysed the responses of interneurons in a katydid species that uses long-lasting acoustic trills and compared these with previously reported data for homologous interneurons of a sympatric species that uses short chirps as acoustic signals. Some interneurons of the trilling species respond exclusively to the heterospecific chirp due to selective, low-frequency tuning and “novelty detection”. These properties have been considered as evolutionary adaptations in the sensory system of the chirper, which allow it to detect signals effectively during the simultaneous calling of the sympatric sibling species. We propose that these two mechanisms, shared by the interneurons of both species, did not evolve in the chirper to guarantee its ability to detect the chirp under masking conditions. Instead we suggest that chirpers evolved an additional, 2-kHz component in their song and exploited pre-existing neuronal properties for detecting their song under masking noise. The failure of some interneurons to respond to the conspecific song in trillers does not prevent intraspecific communication, as other interneurons respond to the trill.

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Matched Filters in Insect Audition: Tuning Curves and Beyond

Cited by 13 publications

References 141 publications

Evolutionary diversification of the auditory organ sensilla in Neoconocephalus katydids (Orthoptera: Tettigoniidae) correlates with acoustic signal diversification over phylogenetic relatedness and life history

Evolutionary diversification of the auditory organ sensilla in Neoconocephalus katydids (Orthoptera: Tettigoniidae) correlates with acoustic signal diversification over phylogenetic relatedness and life history

What determines the number of auditory sensilla in the tympanal hearing organs of Tettigoniidae? Perspectives from comparative neuroanatomy and evolutionary forces

Evolutionarily conserved coding properties favour the neuronal representation of heterospecific signals of a sympatric katydid species

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