Passive acoustic localization techniques of Eastern Pacific grey whales

J.L. Wladichuk, W.M. Megill, P. Blondel

Research output: Contribution to conferencePaper

Abstract

Eastern Pacific grey whales (Eschrichtius robustus) thrive in shallow water environments where visibility is reduced but apparently do not actively echolocate. Along their migration route and in their feeding grounds these whales are exposed to high levels of ambient noise, highly turbid waters and many underwater obstacles. To test possible passive acoustic localization mechanisms (e.g. Acoustic Daylight Imaging and Passive Synthetic Aperture), we made extensive acoustic measurements during comprehensive field studies of these whales on their summer feeding grounds in British Columbia (Canada). In combination with visual observations of the whales and their behaviours, we investigated the acoustical sources available to the whales when navigating within a feeding bay. First, we measured ambient noise levels to construct the acoustic landscape around the whales. Second, we investigated how sound is altered when objects such as kelp beds and rocks are present. We also measured acoustic changes induced by direct, controlled modifications of the near-shore environment. The aim of this research is to understand how grey whales might be finding their way around, and what impact, if any, increased levels of ambient noise might have on the whales' ability to find food and navigate within the feeding grounds.

Conference

Conference7th European Conference on Noise Control 2008, EURONOISE 2008
CountryFrance
CityParis
Period28/06/083/07/08

Fingerprint

whales
acoustics
seaweeds
acoustic imaging
British Columbia
visual observation
synthetic apertures
acoustic measurement
shallow water
Canada
food
visibility
summer
beds
routes
rocks

Cite this

Wladichuk, J. L., Megill, W. M., & Blondel, P. (2008). Passive acoustic localization techniques of Eastern Pacific grey whales. 1709-1714. Paper presented at 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France.

Passive acoustic localization techniques of Eastern Pacific grey whales. / Wladichuk, J.L.; Megill, W.M.; Blondel, P.

2008. 1709-1714 Paper presented at 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France.

Research output: Contribution to conferencePaper

Wladichuk, JL, Megill, WM & Blondel, P 2008, 'Passive acoustic localization techniques of Eastern Pacific grey whales' Paper presented at 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France, 28/06/08 - 3/07/08, pp. 1709-1714.
Wladichuk JL, Megill WM, Blondel P. Passive acoustic localization techniques of Eastern Pacific grey whales. 2008. Paper presented at 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France.
Wladichuk, J.L. ; Megill, W.M. ; Blondel, P./ Passive acoustic localization techniques of Eastern Pacific grey whales. Paper presented at 7th European Conference on Noise Control 2008, EURONOISE 2008, Paris, France.6 p.
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