Journal of Comparative Physiology A

, Volume 186, Issue 6, pp 543–549 | Cite as

Responses of the infrared sensilla of Melanophila acuminata (Coleoptera: Buprestidae) to monochromatic infrared stimulation

  • H. Schmitz
  • M. Mürtz
  • H. Bleckmann
ORIGINAL PAPER

Abstract

The pit organs of the beetle Melanophilaacuminata were stimulated with monochromatic infrared radiation using a continuous wave CO overtone infrared laser. Best sensitivity was in the wavelength range 2.8–3.5 μm. In this range a stimulus intensity of 14.7 mW cm−2 was sufficient to generate single action potentials. At a wavelength of 5 μm receptor performance significantly decreased. An increase in stimulus intensity caused a decrease in response latency and an increase in the number of action potentials elicited. At a given wavelength (3.4 μm) the dynamic amplitude range of action potential responses covered 12 dB. At high stimulus intensities (94.2 mW cm−2) a stimulus duration of 4 ms was sufficient to generate one to two action potentials and a stimulus duration of 60 ms already caused response saturation (with up to nine action potentials). In a repetitive stimulus regime distinct receptor potentials were visible up to a frequency of 600 Hz.

Key wordsMelanophila Infrared receptor Mechanoreceptor Insect cuticle Remote sensing 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • H. Schmitz
    • 1
  • M. Mürtz
    • 2
  • H. Bleckmann
    • 1
  1. 1.Institut für Zoologie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Poppelsdorfer Schloss, D-53115 Bonn, Germany e-mail: h.schmitz@uni-bonn.de Tel.: +49-228-735494; Fax: +49-228-735458DE
  2. 2.Institut für Angewandte Physik der Rheinischen Friedrich-Wilhelms-Universität Bonn, Wegelerstr. 8, D-53115 Bonn, GermanyDE

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