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Composite critical ratio functions for odontocete cetaceans.
Journal of the Acoustical Society of America 2017 October
Critical ratios (CRs) are useful for estimating detection thresholds of tonal signals when the spectral density of noise is known. In cetaceans, CRs have only been measured for a few animals representing four odontocete species. These data are sparse, particularly for lower frequencies where anthropogenic noise is concentrated. There is currently no systematic method for implementing CR predictions (e.g., a composite frequency-dependent CR function). The current study measures CRs for two bottlenose dolphins (Tursiops truncatus) and estimates composite CR functions. The composite models can aid in predicting and extrapolating auditory masking for a broad range of frequencies.
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