Present address: Biology Department & Center for Comparative and Evolutionary Biology of Hearing, University of Maryland, 2217 Biology-Psychology Building, College Park, MD 20742, U.S.A.
Field hearing measurements of the Atlantic sharpnose shark Rhizoprionodon terraenovae
Article first published online: 28 JAN 2010
© 2009 The Authors. Journal compilation © 2009 The Fisheries Society of the British Isles
Journal of Fish Biology
Volume 75, Issue 10, pages 2768–2776, December 2009
How to Cite
Casper, B. M. and Mann, D. A. (2009), Field hearing measurements of the Atlantic sharpnose shark Rhizoprionodon terraenovae. Journal of Fish Biology, 75: 2768–2776. doi: 10.1111/j.1095-8649.2009.02477.x
- Issue published online: 28 JAN 2010
- Article first published online: 28 JAN 2010
- (Received 24 November 2008, Accepted 5 October 2009)
- auditory evoked potential;
- field attraction;
Field measurements of hearing thresholds were obtained from the Atlantic sharpnose shark Rhizoprionodon terraenovae using the auditory evoked potential method (AEP). The fish had most sensitive hearing at 20 Hz, the lowest frequency tested, with decreasing sensitivity at higher frequencies. Hearing thresholds were lower than AEP thresholds previously measured for the nurse shark Ginglymostoma cirratum and yellow stingray Urobatis jamaicensis at frequencies <200 Hz, and similar at 200 Hz and above. Rhizoprionodon terraenovae represents the closest comparison in terms of pelagic lifestyle to the sharks which have been observed in acoustic field attraction experiments. The sound pressure levels that would be equivalent to the particle acceleration thresholds of R. terraenovae were much higher than the sound levels which attracted closely related sharks suggesting a discrepancy between the hearing threshold experiments and the field attraction experiments.