A predicted humpback whale hearing curve based on modified behavioral observation audiometry data.
Rebecca A Dunlop1, Michael J Noad2, Dorian S Houser3
1School of the Environment, University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
Current Biology : CB
|December 25, 2025
Summary
Predicting ocean noise impacts on marine mammals is challenging. This study used behavioral observation audiometry to estimate humpback whale hearing sensitivity, providing crucial data for assessing anthropogenic sound effects.
Area of Science:
- Marine biology
- Bioacoustics
- Animal acoustics
Background:
- Predicting ocean noise impacts on marine mammals requires understanding their hearing capabilities.
- Hearing sensitivity and range data are well-established for odontocetes and pinnipeds but lacking for baleen whales.
- Current methods for baleen whale hearing assessment are limited.
Purpose of the Study:
- To determine the hearing sensitivity and range of free-ranging humpback whales (Megaptera novaeangliae).
- To generate a predictive hearing curve for humpback whales using a novel method.
- To compare the derived hearing curve with one based on anatomical studies.
Main Methods:
- Behavioral observation audiometry (BOA), a method adapted from human pediatric audiology, was employed.
- Minimum response levels (MRLs) were calculated to estimate hearing sensitivity.
- The BOA-derived hearing curve was compared against an anatomically derived curve.
Main Results:
- A predictive hearing curve for humpback whales was successfully generated.
- Evidence suggests humpback whales possess higher frequency hearing capabilities than previously assumed.
- The study provides new data on baleen whale hearing sensitivity.
Conclusions:
- Behavioral observation audiometry is a viable method for estimating hearing sensitivity in large whales.
- The findings provide essential data for regulators and stakeholders to assess anthropogenic sound impacts.
- This research advances our understanding of baleen whale bioacoustics and auditory perception.
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