Comparison of echolocation clicks from geographically sympatric killer whales and long-finned pilot whales (L)

Ida G. Eskesen*, Magnus Wahlberg, Malene Simon, Ole Næsbye Larsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

The source characteristics of biosonar signals from sympatric killer whales and long-finned pilot whales in a Norwegian fjord were compared. A total of 137 pilot whale and more than 2000 killer whale echolocation clicks were recorded using a linear four-hydrophone array. Of these, 20 pilot whale clicks and 28 killer whale clicks were categorized as being recorded on-axis. The clicks of pilot whales had a mean apparent source level of 196 dB re 1 μPa pp and those of killer whales 203 dB re 1 μPa pp. The duration of pilot whale clicks was significantly shorter (23 μs, S.E. 1.3) and the centroid frequency significantly higher (55 kHz, S.E. 2.1) than killer whale clicks (duration: 41 μs, S.E. 2.6; centroid frequency: 32 kHz, S.E. 1.5). The rate of increase in the accumulated energy as a function of time also differed between clicks from the two species. The differences in duration, frequency, and energy distribution may have a potential to allow for the distinction between pilot and killer whale clicks when using automated detection routines for acoustic monitoring.

Original languageEnglish
JournalJournal of the Acoustical Society of America
Volume130
Issue number1
Pages (from-to)9-12
Number of pages4
ISSN0001-4966
DOIs
Publication statusPublished - 1. Jul 2011

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