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Dear Colleagues,
I would like to draw your attention to the following paper, published in the September edition of the Journal of the Acoustical Society of America: Vol 118, No.3, Pt.1 pp.1830-1837 Types, distribution, and seasonal occurrence of sounds attributed to Bryde's whales (Balaenoptera edeni) recorded in the eastern tropical Pacific, 1999-2001 Sara L. Heimlich(1), David K. Mellinger (1) Cooperative Institute for Marine Resources Studies, Oregon State University, and NOAA Pacific Marine Environmental Laboratory, 2030 SE Marine Science Drive, Newport, Oregon 97365 (2) National Geophysical Data Center, National Oceanographic and Atmospheric Administration, 325 Broadway, E/GC, Boulder, Colorado 80305-3328 Abstract Vocalizations resembling known Bryde’s whale sounds were recorded on autonomous hydrophones at seven sites in the eastern tropical Pacific. Five short (<3 s) low-frequency (<80 Hz ) “phrase” types were observed. “Swept alternating tonal” phrases included a 37 Hz tone and often a 25-16 Hz downswept tone, while “non-swept alternating tonal” phrases had a predominant tone at 29 Hz and often additional tones at 16 Hz and 47 Hz. Alternating tonal phrases were found in 79% of the total hours in which phrases were detected, and occurred primarily at the eastern hydrophone sites. “Burst-tonal” phrases included tones that were often preceded by a wide-band burst of noise. The “low burst-tonal” phrase contained tones at 19 Hz and 30 Hz, and was detected at five of the hydrophone sites. The “high burst-tonal” phrase included a 42 Hz tone and was observed only on the northwestern hydrophones. A single “harmonic tone” phrase type was observed that included a fundamental tone at 26 Hz and at least two harmonics; this phrase was observed exclusively at the eastern hydrophone stations. This opportunistic survey has shown that acoustics is an effective means of studying this poorly understood, pelagic balaenopterid. ERRATA: Page 1834, Section C. Geographic and seasonal occurrence. The first sentence should read: Swept and nonswept alternating tonal phrase types were the most abundant of the five types, comprising 1535 (46.3% and 1097 (33.1%). respectively, of the total 3315 PTH. Cheers- Sara Heimlich CIMRS/NOAA Hatfield Marine Science Center, 2030 SE Marine Science Drive, Newport, Oregon 97365 (541) 867-0328
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