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New bioacoustic articles in J. Comp. Physiol. A

Subject: New bioacoustic articles in J. Comp. Physiol. A
From: "Sonja Amoser" <>
Date: Mon, 31 Jan 2011 11:03:19 +0100
Silke KrÃger, Casey S. Butler & Reinhard Lakes-Harlan (2011): Morphological and 
physiological regeneration in the auditory system of adult Mecopoda elongata 
(Orthoptera: Tettigoniidae). J. Comp. Physiol. A 197 (2), 181-192.

Abstract: Orthopterans are suitable model organisms for investigations of 
regeneration mechanisms in the auditory system. Regeneration has been described 
in the auditory systems of locusts (Caelifera) and of crickets (Ensifera). In 
this study, we comparatively investigate the neural regeneration in the 
auditory system in the bush cricket Mecopoda elongata. A crushing of the 
tympanal nerve in the foreleg of M. elongata results in a loss of auditory 
information transfer. Physiological recordings of the tympanal nerve suggest 
outgrowing fibers 5 days after crushing. An anatomical regeneration of the 
fibers within the central nervous system starts 10 days after crushing. The 
neuronal projection reaches the target area at day 20. Threshold values to low 
frequency airborne sound remain high after crushing, indicating a lower 
regeneration capability of this group of fibers. However, within the central 
target area the low frequency areas are also innervated. Recordings of auditory 
interneurons show that the regenerating fibers form new functional connections 
starting at day 20 after crushing.

For reprints please contact Reinhard Lakes-Harlan (email: 

Doreen MÃckel, Ernst-August Seyfarth & Manfred KÃssl (2011): Otoacoustic 
emissions in bushcricket ears: general characteristics and the influence of the 
neuroactive insecticide pymetrozine. J. Comp. Physiol. A 197 (2), 193-202.

Abstract: The tympanal organ of the bushcricket Mecopoda elongata emits 
pronounced distortion-product otoacoustic emissions (DPOAEs). Their 
characteristics are comparable to those measured in other insects, such as 
locusts and moths, with the 2f1âf2 emission being the most prominent one. Yet 
the site of their generation is still unclear. The spatial separation between 
the sound receiving spiracle and the hearing organ in this species allows 
manipulations of the sensory cells without interfering with the acoustical 
measurements. We tried to interfere with the DPOAE generation by 
pharmacologically influencing the tympanal organ using the insecticide 
pymetrozine. The compound appears to act selectively on scolopidia, i.e., the 
mechanosensor type characteristically constituting tympanal organs. Pymetrozine 
solutions were applied as closely as possible to the scolopidia via a cuticle 
opening in the tibia, distally to the organ. Applications of pymetrozine at 
concentrations between 10â3 and 10â7 M to the tympanal organ led to a 
pronounced and irreversible decrease of the DPOAE amplitudes.

For reprints please contact D. MÃckel (email: 

Kind regards


Dr. Sonja Amoser
SteinrieglstraÃe 286
3400 Weidlingbach

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