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Formal report series, containing results of research and monitoring carried out by Marine Scotland Science

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Risk Assessment of Permanent Auditory Injury in Marine Mammals: Differences Arising from the Application of the Southall and NOAA Criteria

Scottish Marine and Freshwater Science Vol 10 No 1

This report investigates the differences between two sets of marine mammal noise exposure criteria in the prediction of permanent auditory injury in marine mammals: the Southall criteria, published in 2007 and the NOAA criteria (also known as the NMFS criteria), published in 2016. Both have been widely adopted in the UK and beyond, with the NOAA criteria considered as the most up-to-date scientific approach. This has created a need among regulators and their advisors for scientific advice on the quantitative differences resulting from the application of each set of criteria, and the reasons underpinning those differences in order to understand these differences in legacy assessments consented under Southall and now being re-assessed under NOAA.

doi: 
10.7489/12205-1
Citation: 
Faulkner, R.C., Farcas, A. and Merchant, N.D. 2019. Risk Assessment of Permanent Auditory Injury in Marine Mammals: Differences Arising from the Application of the Southall and NOAA Criteria. Scottish Marine and Freshwater Science Vol 10 No 1, 32pp. DOI: 10.7489/12205-1
FieldValue
Publisher
Modified
2019-04-25
Release Date
2019-04-25
Identifier
37463c11-5ae9-49b1-b651-6554f7394ec5
Spatial / Geographical Coverage Location
Scotland
License
UK Open Government Licence (OGL)
Data Dictionary

Since there are differences between the criteria in both the cumulative noise exposure thresholds and the auditory weightings (which account for frequency sensitivity in marine mammal hearing), the interplay between these two factors is important.

Cefas has undertaken an analysis and modelling exercise which applied both criteria to representative noise assessment scenarios for UK waters. The aims were:

(i) investigate which set of criteria are more precautionary for each marine mammal hearing group;
(ii) investigate whether there are consistent differences in the effect ranges and effect areas predicted for permanent auditory injury, known as Permanent Threshold Shift (PTS).

Contact Name
Marine Scotland Science
Contact Email
Public Access Level
Public