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Journal of the Acoustical Society of America

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Mar 2002

Volume 111, Issue 3, pp. 1131-1485

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Individual acoustic variation in Belding’s ground squirrel alarm chirps in the High Sierra Nevada

Brenda McCowan and Stacie L. Hooper

J. Acoust. Soc. Am. Volume 111, Issue 3, pp. 1157-1160 (2002); (4 pages) | Cited 4 times

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The acoustic structure of calls within call types can vary as function of individual identity, sex, and social group membership and is important in kin and social group recognition. Belding’s ground squirrels (Spermophilus beldingi) produce alarm chirps that function in predator avoidance but little is known about the acoustic variability of these alarm chirps. The purpose of this preliminary study was to analyze the acoustic structure of alarm chirps with respect to individual differences (e.g., signature information) from eight Belding’s ground squirrels from four different lakes in the High Sierra Nevada. Results demonstrate that alarm chirps are individually distinctive, and that acoustic similarity among individuals may correspond to genetic similarity and thus dispersal patterns in this species. These data suggest, on a preliminary basis, that the acoustic structure of calls might be used as a bioacoustic tool for tracking individuals, dispersal, and other population dynamics in Belding’s ground squirrels, and perhaps other vocal species. © 2002 Acoustical Society of America.
Show PACS
43.80.Ev Acoustical measurement methods in biological systems and media

Optical and atomic force microscopic studies on sonoporation

Joel P. Ross, Xiane Cai, Jen-Fu Chiu, J. Yang, and Junru Wu

J. Acoust. Soc. Am. Volume 111, Issue 3, pp. 1161-1164 (2002); (4 pages) | Cited 2 times

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Optical and atomic force microscopies were used for investigating morphological changes of Jurkat lymphocytes, which showed sonoporation after being exposed to a vibrating Mason horn tuned to 21.4 kHz for 2 min. The tip of the Mason horn had a diameter of 400 μm and its transverse vibration amplitude was 7.8 μm. It was found that immediately after sonification, some cells became irregular in shape but still more or less maintained their sizes, and other cells appeared to be much smaller than their normal sizes. © 2002 Acoustical Society of America.
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43.80.Gx Mechanisms of action of acoustic energy on biological systems: physical processes, sites of action
43.35.Ei Acoustic cavitation in liquids
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