Common dolphin whistle responses to experimental mid-frequency sonar DOI Creative Commons
Caroline Casey, Selene Fregosi, Julie N. Oswald

et al.

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(4), P. e0302035 - e0302035

Published: April 26, 2024

Oceanic delphinids that occur in and around Navy operational areas are regularly exposed to intense military sonar broadcast within the frequency range of their hearing. However, empirically measuring impact on behavior highly social, free-ranging dolphins is challenging. Additionally, baseline variability or vocal state-switching among social oceanic during undisturbed conditions lacking, making it difficult attribute changes anthropogenic disturbance. Using a network drifting acoustic buoys controlled exposure experiments, we investigated effects mid-frequency (3-4 kHz) active (MFAS) whistle production short-beaked (Delphinus delphis delphis) long-beaked common bairdii) southern California. Given complexity exhibited by these group-living animals, conducted our response analysis over varying temporal windows (10 min- 5 s) describe both longer-term instantaneous sound production. We found acute pronounced rate s following simulated MFAS. This was sustained throughout sequential MFAS exposures experiments simulating conditions, suggesting may not habituate this These results indicate exhibit brief yet clearly detectable responses They also highlight how variable windows-tuned key aspects as well experimental parameters related exposure-enable detection behavioral responses. suggest future work with explore rates a-priori use information change inform time window which measured.

Language: Английский

Common dolphin whistle responses to experimental mid-frequency sonar DOI Creative Commons
Caroline Casey, Selene Fregosi, Julie N. Oswald

et al.

PLoS ONE, Journal Year: 2024, Volume and Issue: 19(4), P. e0302035 - e0302035

Published: April 26, 2024

Oceanic delphinids that occur in and around Navy operational areas are regularly exposed to intense military sonar broadcast within the frequency range of their hearing. However, empirically measuring impact on behavior highly social, free-ranging dolphins is challenging. Additionally, baseline variability or vocal state-switching among social oceanic during undisturbed conditions lacking, making it difficult attribute changes anthropogenic disturbance. Using a network drifting acoustic buoys controlled exposure experiments, we investigated effects mid-frequency (3-4 kHz) active (MFAS) whistle production short-beaked (Delphinus delphis delphis) long-beaked common bairdii) southern California. Given complexity exhibited by these group-living animals, conducted our response analysis over varying temporal windows (10 min- 5 s) describe both longer-term instantaneous sound production. We found acute pronounced rate s following simulated MFAS. This was sustained throughout sequential MFAS exposures experiments simulating conditions, suggesting may not habituate this These results indicate exhibit brief yet clearly detectable responses They also highlight how variable windows-tuned key aspects as well experimental parameters related exposure-enable detection behavioral responses. suggest future work with explore rates a-priori use information change inform time window which measured.

Language: Английский

Citations

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