Skip to content

Research at St Andrews

Roaring and repetition: how bowhead whales adjust their call density and source level (Lombard effect) in the presence of natural and seismic airgun survey noise

Research output: Contribution to journalArticle

DOI

Open Access permissions

Open

Abstract

Over 500 000 automated and manual acoustic localizations, measured over seven years between 2008 and 2014, were used to examine how natural wind-driven noise and anthropogenic seismic airgun survey noise influence bowhead whale call densities (calls/km2/min) and source levels during their fall migration in the Alaskan Beaufort Sea. Noise masking effects, which confound measurements of behavioral changes, were removed using a modified point transect theory. The authors found that mean call densities generally rose with increasing continuous wind-driven noise levels. The occurrence of weak airgun pulse sounds also prompted an increase in call density equivalent to a 10–15 dB change in natural noise level, but call density then dropped substantially with increasing cumulative sound exposure level (cSEL) from received airgun pulses. At low in-band noise levels the mean source level of the acoustically-active population changed to nearly perfectly compensate for noise increases, but as noise levels increased further the mean source level failed to keep pace, reducing the population's communication space. An increase of >40 dB cSEL from seismic airgun activity led to an increase in source levels of just a few decibels. These results have implications for bowhead acoustic density estimation, and evaluations of the masking impacts of anthropogenic noise.
Close

Details

Original languageEnglish
Pages (from-to)2061-2080
Number of pages20
JournalJournal of the Acoustical Society of America
Volume147
Issue number3
DOIs
Publication statusPublished - 31 Mar 2020

Discover related content
Find related publications, people, projects and more using interactive charts.

View graph of relations

Related by author

  1. Spatio-temporal variation in click production rates of beaked whales: implications for passive acoustic density estimation

    Warren, V. E., Marques, T. A., Harris, D., Thomas, L., Tyack, P. L., Aguilar de Soto, N., Hickmott, L. S. & Johnson, M. P., Mar 2017, In : Journal of the Acoustical Society of America. 141, 3, p. 1962-1974 13 p.

    Research output: Contribution to journalArticle

  2. Delphinid echolocation click detection probability on near-seafloor sensors

    Frasier, K. E., Wiggins, S. M., Harris, D., Marques, T. A., Thomas, L. & Hildebrand, J. A., Sep 2016, In : Journal of the Acoustical Society of America. 140, 3, p. 1918-1930 13 p.

    Research output: Contribution to journalArticle

  3. Passive acoustic monitoring of beaked whale densities in the Gulf of Mexico

    Hildebrand, J., Baumann-Pickering, S., Frasier, K., Trickey, J., Merkens, K., Wiggins, S., McDonald, M., Garrison, L., Harris, D., Marques, T. A. & Thomas, L., 12 Nov 2015, In : Scientific Reports. 5, 15 p., 16343.

    Research output: Contribution to journalArticle

  4. Estimating animal population density using passive acoustics

    Marques, T. A., Thomas, L., Martin, S., Mellinger, D., Ward, J., Moretti, D., Harris, D. V. & Tyack, P. L., May 2013, In : Biological Reviews of the Cambridge Philosophical Society. 88, 2, p. 287–309

    Research output: Contribution to journalArticle

Related by journal

  1. Comparison of fin whale 20 Hz call detections by deep-water mobile autonomous and stationary recorders

    Fregosi, S., Harris, D. V., Matsumoto, H., Mellinger, D. K., Negretti, C., Moretti, D. J., Martin, S. W., Matsuyama, B., Dugan, P. J. & Klinck, H., 10 Feb 2020, In : Journal of the Acoustical Society of America. 147, 2, p. 961-977 17 p.

    Research output: Contribution to journalArticle

  2. Fin whale acoustic presence and song characteristics in seas to the southwest of Portugal

    Pereira, A., Harris, D., Tyack, P. & Matias, L., Apr 2020, In : Journal of the Acoustical Society of America. 147, 4, p. 2235-2249 15 p.

    Research output: Contribution to journalArticle

  3. Lombard effect: minke whale boing call source levels vary with natural variations in ocean noise

    Helble, T. A., Guazzo, R. A., Martin, C. R., Durbach, I. N., Alongi, G. C., Martin, S. W., Boyle, J. K. & Henderson, E. E., 3 Feb 2020, In : Journal of the Acoustical Society of America. 147, 2, p. 698-712 15 p.

    Research output: Contribution to journalArticle

  4. Repeated downsweep vocalizations of the Araguaian river dolphin, Inia araguaiensis

    Melo-Santos, G., Walmsley, S. F., Marmontel, M., Oliveira-da-Costa, M. & Janik, V. M., Feb 2020, In : Journal of the Acoustical Society of America. 147, p. 748-756

    Research output: Contribution to journalArticle

ID: 267169191

Top