5 Works

Discrete-space continuous-time models of marine mammal exposure to Navy sonar

Charlotte Jones-Todd, Enrico Pirotta, John Durban, Diane Claridge, Robin Baird, Erin Falcone, Greg Schorr, Stephanie Watwood & Len Thomas
Assessing the patterns of wildlife attendance to specific areas is relevant across many fundamental and applied ecological studies, particularly when animals are at risk of being exposed to stressors within or outside the boundaries of those areas. Marine mammals are increasingly being exposed to human activities that may cause behavioural and physiological changes, including military exercises using active sonars. Assessment of the population-level consequences of anthropogenic disturbance requires robust and efficient tools to quantify the...

Data from: First direct measurements of behavioural responses by Cuvier’s beaked whales to mid-frequency active sonar

Stacy L. DeRuiter, Brandon L. Southall, John Calambokidis, Walter M. X. Zimmer, Dinara Sadykova, Erin A. Falcone, Ari S. Friedlaender, John E. Joseph, David Moretti, Gregory S. Schorr, Len Thomas & Peter L. Tyack
Most marine mammal strandings coincident with naval sonar exercises have involved Cuvier’s beaked whales (Ziphius cavirostris). We recorded acoustic and animal movement data on two tagged Ziphius and obtained the first direct measurements of behavioural responses of this species to mid-frequency active (MFA) sonar signals. Each recording included a 30-minute playback (one 1.6-s simulated MFA sonar signal repeated every 25 s); one whale was also incidentally exposed to MFA sonar from distant naval exercises. Whales...

Data from: Discrimination of fast click series produced by tagged Risso’s dolphins (Grampus griseus) for echolocation or communication

Patricia Arranz, Stacy L. DeRuiter, Alison K. Stimpert, Silvana Neves, Ari S. Friedlaender, Jeremy A. Goldbogen, Fleur Visser, John Calambokidis, Brandon L. Southall & Peter L. Tyack
Early studies that categorized odontocete pulsed sounds had few means of discriminating signals used for biosonar-based foraging from those used for communication. This capability to identify the function of sounds is important for understanding and interpreting behavior; it is also essential for monitoring and mitigating potential disturbance from human activities. Archival tags were placed on free-ranging Grampus griseus to quantify and discriminate between pulsed sounds used for echolocation-based foraging and those used for communication. Two...

Data from: Behavioral responses of individual blue whales (Balaenoptera musculus) to mid-frequency military sonar

Brandon L. Southall, Stacy L. DeRuiter, Ari Friedlaender, Alison K. Stimpert, Jeremy A. Goldbogen, Elliott Hazen, Caroline Casey, Selene Fregosi, David E. Cade, Ann N. Allen, Catriona M. Harris, Greg Schorr, David Moretti, Shane Guan & John Calambokidis
This study measured the degree of behavioral responses in blue whales (Balaenoptera musculus) to controlled noise exposure off the southern California coast. High-resolution movement and passive acoustic data were obtained from non-invasive archival tags (n=42) while surface positions were obtained with visual focal follows. Controlled exposure experiments (CEEs) were used to obtain direct behavioral measurements before, during, and after simulated and operational military mid-frequency active sonar (MFAS), pseudorandom noise (PRN), and controls (no noise exposure)....

Data from: Risso' s dolphins plan foraging dives

Patricia Arranz, Kelly J. Benoit-Bird, Brandon L. Southall, John Calambokidis, Ari S. Friedlaender & Peter L. Tyack
Humans remember the past and use that information to plan future actions. Lab experiments that test memory for the location of food show that animals have a similar capability to act in anticipation of future needs, but less work has been done on animals foraging in the wild. We hypothesized that planning abilities are critical and common in breath-hold divers who adjust each dive to forage on prey varying in quality, location, and predictability within...

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  • Cascadia Research
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  • University of St Andrews
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