LMR Completed Projects

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Marine Mammal Monitoring on Ranges (Project #LMR-1)
Principal Investigator: David Moretti

This project finalized hardware/infrastructure for the Marine Mammal Monitoring on Ranges (M3R) system which automated passive acoustic marine mammal detection, localization, classification, and display tools using the Navy’s existing undersea hydrophone ranges. The M3R system aids visual and tagging methods, and enables comprehensive marine mammal monitoring to investigate long-term abundance and behavioral changes in the presence of sonar.

Demonstration of High-performance PAM Glider and Profiler Float (Project #LMR-4)
Principal Investigator: Haru Matsumoto

This project compared two alternative passive acoustic monitoring (PAM) technologies (gliders and drifting floating systems) to assess cost and performance relative to existing Navy PAM systems (moored and towed systems). The technologies demonstrated during this project are now available for use by the Navy’s marine species monitoring program.

Developing Automated Whistle and Click Detectors and Classifiers for Odontocete Species (Project #LMR-5)
Principal Investigator: Julie Oswald

This project developed automated ondontocete detectors and classifiers using both whistles and clicks. The detectors and classifiers developed during this project increase the effectiveness of analyzing passive acoustic monitoring data. These tools are now available for use by the Navy’s marine species monitoring program and the scientific community.

Technology Demonstration for Navy Passive Acoustic Monitoring (Project #LMR-7)
Principal Investigator: John Hildebrand

This project developed and demonstrated improvements to the High-frequency Acoustic Recording Package (HARP) moored passive acoustic monitoring (PAM) systems. The HARPs are being widely used by the Navy’s marine species monitoring program.

Improving the Navy’s Automated Methods for Passive Underwater Acoustic Monitoring of Marine Mammals (Project #LMR-8)
Principal Investigator: Tyler Helble

This project developed a suite of automated signal conditioning tools for normalizing data sets from different ambient acoustic regimes prior to submitting such data to standardized automated signal processing systems.

Electrophysiological Correlates of Subjective Loudness in Marine Mammals (Project #LMR-9)
Principal Investigator: Jim Finneran

This project investigated potential reasons why hearing data obtained by measuring auditory evoked potentials (AEPs) were not reliable for use in determining marine mammal weighting functions. Research found that low frequency stimuli produced both low and high frequency AEPs, and therefore the AEP measurements were not reliable at predicting perceived loudness in marine mammals at low frequencies.

Project #LMR-9 Publications:
Finneran, J.J., Mulsow, J., Houser, D.S., and Burkard, R.F. (2015). Place specificity of dolphin auditory evoked potentials assessed with high-pass masking noise. The Journal of the Acoustical Society of America, 137:2219.

Mulsow, J., Finneran, J. J., Schlundt, C. E. (2015). Equal-latency curves and auditory weighting functions for bottlenose dolphins (Tursiops truncatus) and California sea lions (Zalophus californianus). The Journal of the Acoustical Society of America, 137(4):2219.

Mulsow, J., Schlundt, C. E., Brandt, L., Finneran, J. J. (2015). Equal latency contours for bottlenose dolphins (Tursiops truncatus) and California sea lions (Zalophus californianus). The Journal of the Acoustical Society of America, 138(5):2678.

Audiograms of Hearing in Baleen Whales: A Model System for Mitigating Sound Impacts (Project #LMR-11)
Principal Investigator: Darlene Ketten

This project predicted a range of best hearing for the humpback whale based on a finite element model (FEM) of the middle ear.

Project #LMR-11 Publication:;
Manuscript in review.

Behavioral Audiometry in Multiple Killer Whales (Project #LMR-14)
Principal Investigator: Brian Branstetter

The study provided the first demographic hearing data from killer whales by measuring behavioral audiograms for animals of multiple ages.

Project #LMR-14 Publication:
Branstetter, B. K., St. Leger, J. Acton, D., Stewart, J., Houser, D., Finneran, J. J., and Jenkins, K. (2017). Killer whale (Orcinus orca) behavioral audiograms. The Journal of the Acoustical Society of America, 141(4), 2387–2398.