2012/02/29 by Mariana L. Melcón, Amanda J. Cummins, Sara M. Kerosky +3 · 4 citations
Environmental Science · Earth and Planetary Sciences · Biochemistry, Genetics and Molecular Biology · #Marine animal studies overview #Underwater Acoustics Research #Animal Vocal Communication and Behavior
paper · pdf · doi:10.1371/journal.pone.0032681
openalex publication_date 2012/02/29 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Anthropogenic noise may significantly impact exposed marine mammals. This work studied the vocalization response of endangered blue whales to anthropogenic noise sources in the mid-frequency range using passive acoustic monitoring in the Southern California Bight. Blue whales were less likely to produce calls when mid-frequency active sonar was present. This reduction was more pronounced when the sonar source was closer to the animal, at higher sound levels. The animals were equally likely to stop calling at any time of day, showing no diel pattern in their sensitivity to sonar. Conversely, the likelihood of whales emitting calls increased when ship sounds were nearby. Whales did not show a differential response to ship noise as a function of the time of the day either. These results demonstrate that anthropogenic noise, even at frequencies well above the blue whales' sound production range, has a strong probability of eliciting changes in vocal behavior. The long-term implications of disruption in call production to blue whale foraging and other behaviors are currently not well understood.