Document Type
Article
Original Publication Date
2015
Journal/Book/Conference Title
Journal of Comparative Physiology A
Volume
201
Issue
3
First Page
305
Last Page
315
DOI of Original Publication
10.1007/s00359-014-0970-7
Date of Submission
July 2016
Abstract
Catfishes produce pectoral stridulatory sounds by “jerk” movements that rub ridges on the dorsal process against the cleithrum. We recorded sound synchronized with high-speed video to investigate the hypothesis that blue catfish Ictalurus furcatus produce sounds by a slip–stick mechanism, previously described only in invertebrates. Blue catfish produce a variably paced series of sound pulses during abduction sweeps (pulsers) although some individuals (sliders) form longer duration sound units (slides) interspersed with pulses. Typical pulser sounds are evoked by short 1–2 ms movements with a rotation of 2°–3°. Jerks excite sounds that increase in amplitude after motion stops, suggesting constructive interference, which decays before the next jerk. Longer contact of the ridges produces a more steady-state sound in slides. Pulse pattern during stridulation is determined by pauses without movement: the spine moves during about 14 % of the abduction sweep in pulsers (~45 % in sliders) although movement appears continuous to the human eye. Spine rotation parameters do not predict pulse amplitude, but amplitude correlates with pause duration suggesting that force between the dorsal process and cleithrum increases with longer pauses. Sound production, stimulated by a series of rapid movements that set the pectoral girdle into resonance, is caused by a slip–stick mechanism.
Rights
© 2014 Springer-Verlag Berlin Heidelberg
Is Part Of
VCU Forensic Science Publications
Comments
The final publication is available at Springer via http://dx.doi.org/10.1007/s00359-014-0970-7