Abstract
Four vocalizations (whistles, buzzes, quacks, and pops) were quantified during three behavioral categories (socializing, traveling, and feeding) of the bottlenose dolphin in the Newport River Estuary, North Carolina. This study tested the hypothesis that specific vocalizations of dolphins in this area are associated with specific behavioral categories during the summer and fall. Approximately twice the total number of vocalizations per unit time occurred during the fall as compared to the summer. Each type of vocalization had a distinctive and consistent acoustical structure. The relative frequency of the different vocalization types was significantly dependent on the behavior of the dolphins. Pops were consistently associated with feeding, quacks with socializing, and buzzes with traveling. Whistles, the most common vocalization, were associated with traveling and feeding during the summer and socializing in the fall. Dolphins spent more time involved in undirected activity (socialization) during the summer but spent more time traveling in search of food and feeding during the fall in preparation for migration out of the estuary and movement south.
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Literature Cited
Caldwell, M. C., D. K. Caldwell, andP. L. Tyack. 1990. Review of the signature-whistle hypothesis for the Atlantic bottlenose dolphin, p. 199–233.In S. Leatherwood and R. R. Reeves (eds.), The Bottlenose Dolphin. Academic Press, San Diego.
Dreher, J. J. 1977. Cetacean communication: Small-group experiment, p. 529–543.In K. S. Norris (ed.), Whales, Dolphins, and Porpoises, University of California Press, Berkeley, California.
Gaskin, D. E. 1982. The Ecology of Whales and Dolphins. Heinemann, London. 459 p.
Kellogg, W. N. 1961. Porpoises and Sonar. University of Chicago Press, Chicago, 177 p.
Lilly, J. C. andA. M. Miller. 1961. Vocal exchanges between dolphins.Science 134:1873–1876.
Mead, J. G. 1974. Preliminary report on the former net fishery forTursiops truncatus in the western North Atlantic.Journal of the Fisheries Research Board of Canada 32:1155–1162.
Mead, J. G. andC. W. Potter. 1990. Natural history of bottlenose dolphins along the central Atlantic coast of the United States, p. 165–195.In S. Leartherwood and R. R. Reeves (eds.), The Bottlenose Dolphin, Academic Press, San Diego.
Norris, K. S. andT. P. Dohl. 1988. The structure and functions of cetacean schools, p. 211–261.In L. M. Herman (ed.), Cetacean Behavior: Mechanisms and Function. Robert E. Krieger Publishing Co., Malabar, Florida.
Norris, K. S. andB. Mohl. 1983. CanOdontocetes debilitate prey with sound?.The American Naturalist 122:85–104.
Rohlf, F. J. 1986. BIOM: A package of statistical programs to accompany the text Biometry. Department of Ecology and Evolution, State University of New York at Stony Brook, Stony Brook, New York. 70 p.
Sokal, R. R. andF. J. Rohlf. 1981. Biometry: The Principles and Practice of Statistics in Biological Research. Second Edition. W. H. Freeman, New York. 859 p.
Wells, R. A., A. B. Irvine, andM. S. Scott. 1988. The social ecology of inshoreOdontocetes, p. 263–317.In L. M. Herman (ed.), Cetacean Behavior: Mechanisms and Function. Robert E. Krieger Publishing Co., Malabar, Florida.
Wood, F. G., Jr. 1953. Underwater sound production and concurrent behavior of captive porpoisesTursiops truncatus andStenella plagiodon.Bulletin of Marine Science of the Gulf and Caribbean 3:121–133.
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Jacobs, M., Nowacek, D.P., Gerhart, D.J. et al. Seasonal changes in vocalization during behavior of the Atlantic bottlenose dolphin. Estuaries 16, 241–246 (1993). https://doi.org/10.2307/1352496
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DOI: https://doi.org/10.2307/1352496