The Risso’s dolphin (Grampus griseus) is an exclusively cephalopod-consuming delphinid with a distinctive vertical indentation along its forehead. To investigate whether or not the species echolocates, a female Risso’s dolphin was trained to discriminate an aluminum cylinder from a nylon sphere (experiment 1) or an aluminum sphere (experiment 2) while wearing eyecups and free swimming in an open-water pen in Kaneohe Bay, Hawaii. The dolphin completed the task with little difficulty despite being blindfolded. Clicks emitted by the dolphin were acquired at average amplitudes of 192.6 dB re 1 μPa, with estimated sources levels up to 216 dB re 1 μPa-1 m. Clicks were acquired with peak frequencies as high as 104.7 kHz center frequencies as high as 85.7 kHz 3-dB bandwidths up to 94.1 kHz and root-mean-square bandwidths up to 32.8 kHz Click durations were between 40 and 70 μs. The data establish that the Risso’s dolphin echolocates, and that, aside from slightly lower amplitudes and frequencies, the clicks emitted by the dolphin were similar to those emitted by other echolocating odontocetes. The particular acoustic and behavioral findings in the study are discussed with respect to the possible direction of the sonar transmission beam of the species.
REFERENCES
1.
Au, W. W. L. (1980). “Echolocation signals of the Atlantic bottlenose dolphin (Tursiops truncatus) in open waters,” in Animal Sonar Systems, edited by R. G. Bushnel and J. F. Fish (Plenum, New York), pp. 251–282.
2.
Au, W. W. L. (1993). The Sonar of Dolphins (Springer-Verlag, New York).
3.
Au
, W. W. L.
, Carder
, D. A.
, Penner
, R. H.
, and Scronce
, B. L.
(1985
). “Demonstration of adaptation in beluga whale echolocation signals
,” J. Acoust. Soc. Am.
77
, 726
–730
.4.
Au
, W. W. L.
, Moore
, P. W. B.
, and Pawloski
, D.
(1986
). “Echolocation transmitting beam of the Atlantic bottlenose dolphin
,” J. Acoust. Soc. Am.
80
, 688
–691
.5.
Au
, W. W. L.
, Penner
, R. H.
, and Turl
, C. W.
(1987
). “Propagation of beluga echolocation signals
,” J. Acoust. Soc. Am.
82
, 807
–813
.6.
Au
, W. W. L.
, Floyd
, R. W.
, Penner
, R. H.
, and Murchison
, A. E.
(1974
). “Measurement of echolocation signals of the Atlantic bottlenose dolphin, Tursiops truncatus Montagu, in open waters
,” J. Acoust. Soc. Am.
56
, 1280
–1290
.7.
Au
, W. W. L.
, Kasteleini
, R. A.
, Rippe
, T.
, and Schooneman
, N. M.
(1999
). “Transmission beam pattern and echolocation signals of a harbor porpoise (Phocoena phocoena)
,” J. Acoust. Soc. Am.
106
, 3699
–3705
.8.
Au
, W. W. L.
, Pawloski
, J. L.
, Nachtigall
, P. E.
, Blonz
, M.
, and Gisner
, R. C.
(1995
). “Echolocation signals and transmission beam pattern of a false killer whale (Pseudorca crassidens)
,” J. Acoust. Soc. Am.
98
, 51
–59
.9.
Baumgartner
, M. F.
(1997
). “The distribution of Risso’s dolphin (Grampus griseus) with respect to the physiography of the Northern Gulf of Mexico
,” Marine Mammal Sci.
13
, 614
–638
.10.
Brill
, R. L.
, Pawloski
, J. L.
, Helweg
, D. A.
, Au
, W. W.
, and Moore
, P. W. B.
(1992
). “Target detection, shape discrimination, and signal characteristics of an echolocating false killer whale (Pseudorca crassidens)
,” J. Acoust. Soc. Am.
92
, 1324
–1330
.11.
Caldwell
, D. K.
, Caldwell
, M. C.
, and Miller
, J. F.
(1969). “Three brief narrow-band sound emissions by a captive male Risso’s dolphin, Grampus griseus,” Bull. So. Calif. Acad. Sci. 68, 252–256.12.
Clarke, M. R. (1986). “Cephalopods in the diet of odontocetes,” in Research on Dolphins, edited by M. M. Bryden and R. Harrison (Clarendon, Oxford), pp. 281–321.
13.
Clarke
, M. R.
, and Pascoe
, P. L.
(1985
). “The stomach contents of Risso’s dolphin (Grampus griseus) stranded at Thurlestone, South Devon
,” J. Mar. Biol. Assoc. U.K.
65
, 663
–665
.14.
Clarke
, M.
, and Young
, R.
(1998
). “Description and analysis of cephalopod beaks from the stomachs of six species of odontocete cetaceans stranded on Hawaiian shores
,” J. Mar. Biol. Assoc. U.K.
78
, 623
–641
.15.
Cockcroft
, V. G.
, Haschick
, S. L.
, and Klages
, N. T. W.
(1993). “The diet of Risso’s dolphin, Grampus griseus (Cuvier, 1812), from the east coast of South Africa,” Z. Säugetierkunde 58, 286–293.16.
Corkeron
, P. J.
, and Van Parijs
, S. M.
(2001
). “Vocalizations of eastern Australian Risso’s dolphins, Grampus griseus
,” Can. J. Zool.
79
, 160
–164
.17.
Cranford, T. (1988). “The anatomy of acoustic structures in the spinner dolphin forehead as shown by X-ray computed tomography and computer graphics,” in Animal Sonar: Processes and Performance, edited by P. E. Nachtigall and P. W. B. Moore (Plenum, New York), pp. 67–77.
18.
Cranford
, T. W.
, Amundin
, M.
, and Norris
, K. S.
(1996
). “Functional morphology and homology in the odontocete nasal complex: Implications for sound generation
,” J. Morphol.
228
, 223
–285
.19.
Foote
, K. G.
(1980
). “Importance of the swimbladder in acoustic scattering by fish: A comparison of gadoid and mackerel target strengths
,” J. Acoust. Soc. Am.
67
, 2084
–2089
.20.
Gellermann
, L. W.
(1933
). “Chance orders of alternating stimuli in visual discrimination experiments
,” J. Gen. Psychol.
42
, 206
–208
.21.
Hatakeyama, Y., and Soeda, H. (1990). “Studies on echolocation of porpoises taken in salmon gillnet fisheries,” in Sensory Abilities of Cetaceans: Laboratory and Field Evidence, edited by J. A. Thomas and R. Kastelein (Plenum, New York), pp. 269–281.
22.
Jefferts
, K.
, Burczynski
, J. J.
, and Pearcy
, W. G.
(1987
). “Acoustical assessment of squid Loligo opalescens off the Central Oregon coast
,” Can. J. Fish. Aquat. Sci.
44
, 1261
–1267
.23.
Johnson, C. S. (1967). “Sound detection thresholds in marine mammals,” in Marine BioAcoustics, edited by W. Tavolga (Pergamon, New York), pp. 240–260.
24.
Leatherwood, S., Reeves, R. R., and Foster, L. (1983). The Sierra Club Handbook of Whales and Dolphins (Tien Wah, Singapore).
25.
Leatherwood
, S.
, Perrin
, W. F.
, Kirby
, V. L.
, Hubbs
, C. L.
, and Dahleim
, M.
(1980
). “Distribution and movements of Risso’s dolphin, Grampus griseus, in the Eastern North Pacific
,” Fish. Bull.
77
, 951
–963
.26.
Litchfield
, C.
, Karol
, R.
, Mullen
, M. E.
, Dilger
, J. P.
, and Lüthi
, B.
(1979
). “Physical factors influencing refraction of the echolocative sound beam in delphinid cetaceans
,” Mar. Biol.
52
, 285
–290
.27.
MacLennan, D. N., and Simmonds, E. J. (1992). Fisheries Acoustics (Chapman and Hall, London), Chap. 6.
28.
Moore, P. W. B., and Pawloski, D. A. (1990). “Investigations on the control of echolocation pulses in the dolphin (Tursiops truncatus),” in Sensory Abilities of Cetaceans: Laboratory and Field Evidence, edited by J. Thomas and R. Kastelein (Plenum, New York), pp. 305–316.
29.
Nachtigall, P. E., Au, W. W. L., Pawloski, J. L., and Moore, P. W. B. (1995). “Risso’s dolphin (Grampus griseus) hearing thresholds in Kaneohe Bay, Hawaii,” in Sensory Systems of Aquatic Mammals, edited by R. A. Kastelein, J. A. Thomas, and P. E. Nachtigall (De Spil, The Netherlands), pp. 49–53.
30.
Nachtigall, P. E., Lemonds, D. W., and Roitblat, H. L. (2000). “Psychoacoustic studies of dolphin and whale hearing,” in Hearing by Whales, edited by W. W. L. Au, A. N. Popper, and R. J. Fay (Springer-Verlag, New York), pp. 330–363.
31.
Norris, K. S. (1968). “The evolution of acoustic mechanisms in odontocete cetaceans,” in Evolution and Environment, edited by E. T. Drake (Yale Univ., New Haven), pp. 297–324.
32.
Penrose
, J. D.
, and Kaye
, G. T.
(1979
). “Acoustic target strengths of marine organisms
,” J. Acoust. Soc. Am.
65
, 374
–380
.33.
Philips, J. D., Au, W. W. L., Nachtigall, P. E., Pawloski, J. L., and Roitblat, H. L. (in press). “Echolocation in the Risso’s dolphin, Grampus griseus: A preliminary report,” in Echolocation in Bats and Dolphins, edited by J. Thomas, C. Moss, and M. Vater (Univ. of Chicago, Chicago).
34.
Rasmussen
, M. H.
, Miller
, L. A.
, and Au
, W. W. L.
(2002
). “Source levels of clicks from free-ranging white-beaked dolphins (Lagenorhynchus albirostris, Gray, 1846) recorded in Icelandic waters
,” J. Acoust. Soc. Am.
111
, 1122
–1125
.35.
Thomas, J. A., and Turl, C. W. (1990). “Echolocation characteristics and range detection by a false killer whale (Pseudorca crassidens),” in Sensory Abilities of Cetaceans: Laboratory and Field Evidence, edited by J. A. Thomas and R. A. Kastelein (Plenum, New York), pp. 321–334.
36.
Thomas
, J.
, Chun
, M.
, Au
, W.
, and Pugh
, K.
(1988
). “Underwater audiogram of a false killer whale (Pseudorca crassidens)
,” J. Acoust. Soc. Am.
84
, 936
–940
.37.
Urick, R. J. (1983). Principles of Underwater Sound (McGraw–Hill, New York).
38.
Verfuss, U. K., Garcia-Hartmann, M., and Schnitzler, H.-U. (1998). “Hunting and echolocation behavior of a captive Amazon river dolphin (Inia geoffrensis), Biological Sonar Conference, 27 May to 2 June 1998, Carvoerio, Portugal, p. 45 (abstract).
39.
White, M. J., Jr., Norris, J., Ljungblad, D., Baron, K., and di Sciara, G. (1978). “Auditory thresholds of two beluga whales (Delphinapterus leucas),” HSWRI Technical Report No. 78-109, Hubbs Marine Research Institute, San Diego, CA.
40.
Wood, F. G., and Evans, W. E. (1980). “Adaptiveness and ecology of echolocation in toothed whales,” in Animal Sonar Systems, edited by R. G. Busnel and J. F. Fish (Plenum, New York), pp. 381–425.
41.
Wurtz
, M.
, Poggi
, R.
, and Clarke
, M. R.
(1992
). “Cephalopods from the stomachs of a Risso’s dolphin (Grampus griseus) from the Mediterranean
,” J. Mar. Biol. Assoc. U.K.
72
, 861
–867
.
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