Males miss and females forgo: auditory masking from vessel noise impairs foraging efficiency and success in killer whales

Tennessen, Jennifer B. ORCID: https://orcid.org/0000-0002-1303-415X , Holt, Marla M. ORCID: https://orcid.org/0000-0003-4153-1484 , Wright, Brianna M. ORCID: https://orcid.org/0000-0003-1243-4415 , Hanson, M. Bradley, Emmons, Candice K. ORCID: https://orcid.org/0000-0003-1326-3646 , Giles, Deborah A. ORCID: https://orcid.org/0000-0002-2701-4117 , Hogan, Jeffrey T. ORCID: https://orcid.org/0000-0002-9928-2145 , Thornton, Sheila J. ORCID: https://orcid.org/0000-0001-7996-5873 and Deecke, Volker B. ORCID: https://orcid.org/0000-0003-2781-5915 (2024) Males miss and females forgo: auditory masking from vessel noise impairs foraging efficiency and success in killer whales. Global Change Biology, 30 (9). e17490.

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Abstract

Understanding how the environment mediates an organism's ability to meet basic survival requirements is a fundamental goal of ecology. Vessel noise is a global threat to marine ecosystems and is increasing in intensity and spatiotemporal extent due to growth in shipping coupled with physical changes to ocean soundscapes from ocean warming and acidification. Odontocetes rely on biosonar to forage, yet determining the consequences of vessel noise on foraging has been limited by the challenges of observing underwater foraging outcomes and measuring noise levels received by individuals. To address these challenges, we leveraged a unique acoustic and movement dataset from 25 animal‐borne biologging tags temporarily attached to individuals from two populations of fish‐eating killer whales (Orcinus orca) in highly transited coastal waters to (1) test for the effects of vessel noise on foraging behaviors—searching (slow‐click echolocation), pursuit (buzzes), and capture and (2) investigate the mechanism of interference. For every 1 dB increase in maximum noise level, there was a 4% increase in the odds of searching for prey by both sexes, a 58% decrease in the odds of pursuit by females and a 12.5% decrease in the odds of prey capture by both sexes. Moreover, all but one deep (≥75 m) foraging attempt with noise ≥110 dB re 1 μPa (15–45 kHz band; n = 6 dives by n = 4 whales) resulted in failed prey capture. These responses are consistent with an auditory masking mechanism. Our findings demonstrate the effects of vessel noise across multiple phases of odontocete foraging, underscoring the importance of managing anthropogenic inputs into soundscapes to achieve conservation objectives for acoustically sensitive species. While the timescales for recovering depleted prey species may span decades, these findings suggest that complementary actions to reduce ocean noise in the short term offer a critical pathway for recovering odontocete foraging opportunities.

Item Type:	Article
Journal / Publication Title:	Global Change Biology
Publisher:	Wiley
ISSN:	1365-2486
Departments:	Institute of Science and Environment > Forestry and Conservation
Additional Information:	This is an open access article under the terms of the Creative Commons Attribution-Non Commercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Depositing User:	Insight Administrator
SWORD Depositor:	Insight Administrator
Date Deposited:	11 Sep 2024 08:41
Last Modified:	11 Sep 2024 08:45
URI:	https://insight.cumbria.ac.uk/id/eprint/8388

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