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

Ida Eskesen, Magnus Wahlberg, Malene Simon, Ole Næsbye Larsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

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 lPa pp and those of killer whales
203 dB re 1 lPa pp. The duration of pilot whale clicks was significantly shorter (23 ls, S.E.¼1.3)
and the centroid frequency significantly higher (55 kHz, S.E.¼2.1) than killer whale clicks (duration:
41 ls, S.E.¼2.6; centroid frequency: 32 kHz, S.E.¼1.5). 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.
OriginalsprogEngelsk
TidsskriftJournal of the Acoustical Society of America
Vol/bind130
Udgave nummer1
Sider (fra-til)9-12
Antal sider4
ISSN0001-4966
StatusUdgivet - jul. 2010

Fingeraftryk

Dyk ned i forskningsemnerne om 'Comparison of echolocation clicks from geographically sympatric killer whales and long-finned pilot whales'. Sammen danner de et unikt fingeraftryk.

Citationsformater