Behavioral responses of California sea lions to mid-frequency (3250–3450 Hz) sonar signals

• Published in: Marine environmental research Vol. 92; pp. 268 - 278
• Main Authors: Houser, Dorian S., Martin, Stephen W., Finneran, James J.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.12.2013; Elsevier
• Subjects: Acoustic exposure; Acoustic Stimulation; acoustics; Age Factors; Animal and plant ecology; Animal, plant and microbial ecology; Animals; Behavior; Behavior, Animal; Behavioral response; Biological and medical sciences; Dose–response; Fundamental and applied biological sciences. Psychology; Mammalia; Mammals; marine mammals; Noise; physiology; Sea lion; Sea Lions; Sea Lions - physiology; Sea water ecosystems; Sound; Synecology; Vertebrates: general zoology, morphology, phylogeny, systematics, cytogenetics, geographical distribution; Zalophus californianus; CCA; MMP; Dose–response; SSC; Behavioral response; Noise; rms; Behavior; Mammals; Acoustic exposure; SPL; Sea lion; Carnivora; Zalophus californianus; Sonar; Dose―response; Acoustics; Pinnipedia; Dose activity relation; Marine environment; Vertebrata; Signal; Mammalia; canonical correlation analysis; Space and Naval Warfare Systems Center; sound pressure level; root-mean-squared; Marine Mammal Program
• ISSN: 0141-1136; 1879-0291; 1879-0291
• DOI: 10.1016/j.marenvres.2013.10.007

Military sonar has the potential to negatively impact marine mammals. To investigate factors affecting behavioral disruption in California sea lions (Zalophus californianus), fifteen sea lions participated in a controlled exposure study using a simulated tactical sonar signal (1 s duration, 3250–3450 Hz) as a stimulus. Subjects were placed into groups of three and each group received a stimulus exposure of 125, 140, 155, 170, or 185 dB re: 1 μPa (rms). Each subject was trained to swim across an enclosure, touch a paddle, and return to the start location. Sound exposures occurred at the mid-point of the enclosure. Control and exposure sessions were run consecutively and each consisted of ten, 30-s trials. The occurrence and severity of behavioral responses were used to create acoustic dose–response and dose–severity functions. Age of the subject significantly affected the dose–response relationship, but not the dose–severity relationship. Repetitive exposures did not affect the dose–response relationship. •Sea lions show a dose–response relationship to increasing levels of sound exposure.•The severity of the response also increases directly with sound pressure level.•Sea lions did not demonstrate desensitization across repetitive exposures.•Age of the sea lion was a significant factor affecting the dose–response function.