The mechanical leg response to vibration stimuli in cave crickets and implications for vibrosensory organ functions

Original Paper
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Abstract

We investigate the influence of leg mechanics on the vibration input and function of vibrosensitive organs in the legs of the cave cricket Troglophilus neglectus, using laser Doppler vibrometry. By varying leg attachment, leg flexion, and body posture, we identify important influences on the amplitude and frequency parameters of transmitted vibrations. The legs respond best to relatively high-frequency vibration (200–2000 Hz), but in strong dependence on the leg position; the response peak shifts progressively over 500–1400 Hz towards higher frequencies following leg flexion. The response is amplified most strongly on the tibia, where specialised vibrosensory organs occur, and the response amplitude increases with the increasing frequency. Leg responses peaking at 800 and 1400 Hz closely resemble the tuning of the intermediate organ receptors in the proximal tibia of T. neglectus, which may be highly sensitive to positional change. The legs of free-standing animals with the abdomen touching the vibrating substrate show a secondary response peak below 150 Hz, induced by body vibration. Such responses may significantly increase the sensitivity of low-frequency receptors in the tibial accessory organ and the femoral chordotonal organ. The cave cricket legs appear suitable especially for detection of high-frequency vibration.

Keywords

Vibration transmission Vibration reception Mechanoreception Sensory evolution Biotremology 

Notes

Acknowledgements

We thank Reinhard Lakes-Harlan (Justus-Liebig-Universität Gießen) for support, and are indebted to Daniel Svenšek (Faculty of Mathematics and Physics, University of Ljubljana) for the discussion of data in the light of resonance phenomena. We are grateful to one anonymous reviewer and to Rex Cocroft for their constructive comments that helped to improve the manuscript. We thank Danait Araia for correcting the language. NSP acknowledges the financial support from the Slovenian Research Agency (research core funding P1-0255). JS was supported by a Young Investigator Grant from the Justus-Liebig-Universität Gießen.

Compliance with ethical standards

Conflict of interest

No competing interests declared.

Ethical statement

All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. This article does not contain any studies with human participants performed by any of the authors.

Supplementary material

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Organisms and Ecosystems ResearchNational Institute of BiologyLjubljanaSlovenia
  2. 2.AG Integrative Sensory Physiology, Institute for Animal PhysiologyJustus-Liebig-Universität Gießen35392 GießenGermany

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