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- Title
Hearing in the crepuscular owl butterfly ( Caligo eurilochus, Nymphalidae).
- Authors
Lucas, Kathleen; Mongrain, Jennifer; Windmill, James; Robert, Daniel; Yack, Jayne
- Abstract
Tympanal organs are widespread in Nymphalidae butterflies, with a great deal of variability in the morphology of these ears. How this variation reflects differences in hearing physiology is not currently understood. This study provides the first examination of hearing organs in the crepuscular owl butterfly, Caligo eurilochus. We examined the tuning and sensitivity of the C. eurilochus hearing organ, called Vogel's organ, using laser Doppler vibrometry and extracellular neurophysiology. We show that the C. eurilochus ear responds to sound and is most sensitive to frequencies between 1 and 4 kHz, as confirmed by both the vibration of the tympanal membrane and the physiological response of the associated nerve branches. In comparison to the hearing of its diurnally active relative, Morpho peleides, C. eurilochus has a narrower frequency range with higher auditory thresholds. Hypotheses explaining the function of hearing in this crepuscular butterfly are discussed.
- Subjects
TYMPANAL organ; BUTTERFLIES; LASER Doppler velocimeter; NEUROPHYSIOLOGY; MORPHO peleides
- Publication
Journal of Comparative Physiology A: Neuroethology, Sensory, Neural & Behavioral Physiology, 2014, Vol 200, Issue 10, p891
- ISSN
0340-7594
- Publication type
Article
- DOI
10.1007/s00359-014-0933-z