Behavioural responses of common dolphins to naval sonar DOI Creative Commons
Brandon L. Southall, John W. Durban, John Calambokidis

et al.

Royal Society Open Science, Journal Year: 2024, Volume and Issue: 11(10)

Published: Oct. 1, 2024

Despite strong interest in how noise affects marine mammals, little is known for the most abundant and commonly exposed taxa. Social delphinids occur groups of hundreds individuals that travel quickly, change behaviour ephemerally are not amenable to conventional tagging methods, posing challenges quantifying impacts. We integrated drone-based photogrammetry, strategically placed acoustic recorders broad-scale visual observations provide complementary measurements different aspects short- long-beaked common dolphins. measured behavioural responses during controlled exposure experiments (CEEs) military mid-frequency (3–4 kHz) active sonar (MFAS) using simulated actual Navy sources. used latent-state Bayesian models evaluate response probability persistence post-exposure phases. Changes subgroup movement aggregation parameters were detected phases MFAS CEEs but control CEEs. Responses more evident short-beaked dolphins ( n = 14 CEEs), a direct relationship between received level was observed. Long-beaked 20) showed less consistent responses, although contextual differences may have limited which could be detected. These first experimental data these directly inform impact assessments sonars.

Language: Английский

Behavioural responses of common dolphins to naval sonar DOI Creative Commons
Brandon L. Southall, John W. Durban, John Calambokidis

et al.

Royal Society Open Science, Journal Year: 2024, Volume and Issue: 11(10)

Published: Oct. 1, 2024

Despite strong interest in how noise affects marine mammals, little is known for the most abundant and commonly exposed taxa. Social delphinids occur groups of hundreds individuals that travel quickly, change behaviour ephemerally are not amenable to conventional tagging methods, posing challenges quantifying impacts. We integrated drone-based photogrammetry, strategically placed acoustic recorders broad-scale visual observations provide complementary measurements different aspects short- long-beaked common dolphins. measured behavioural responses during controlled exposure experiments (CEEs) military mid-frequency (3–4 kHz) active sonar (MFAS) using simulated actual Navy sources. used latent-state Bayesian models evaluate response probability persistence post-exposure phases. Changes subgroup movement aggregation parameters were detected phases MFAS CEEs but control CEEs. Responses more evident short-beaked dolphins ( n = 14 CEEs), a direct relationship between received level was observed. Long-beaked 20) showed less consistent responses, although contextual differences may have limited which could be detected. These first experimental data these directly inform impact assessments sonars.

Language: Английский

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