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Auditory masking of tonal and conspecific signals by continuous active sonar, amplitude modulated noise, and Gaussian noise in killer whales (Orcinus orca).
J Acoust Soc Am
October 2024
Naval Information Warfare Center Pacific, San Diego, California 92152, USA.
Article Synopsis
- Continuous active sonar produces lower sound pressure levels compared to traditional pulsed active sonar but can cause higher auditory masking due to its constant operation.
- The study evaluates how different noise types, including continuous active sonar, affect signal detection in killer whales using both a pure tone and a whale call.
- Results show that while other noise types allowed for some frequency detection, continuous active sonar significantly overlaps with killer whale calls, making it a strong auditory masker.*
Cetacean passive acoustic network in the Belgian part of the North sea.
Sci Data
September 2024
Flanders Marine Institute (VLIZ), Slipwaykaai 2, 8400, Oostende, Belgium.
In 2016, a design for detecting harbor porpoises (Phocoena phocoena) in the Belgian part of the North Sea (BPNS) was developed in the framework of the LifeWatch project using Passive Acoustic Monitoring (PAM) loggers. In 2018, the network of deployments fully matured, and eight locations across the BPNS are presently housed with a C-POD (Chelonia Ltd., UK), a PAM logger moored on the seafloor using a multi-use platform.
View Article and Find Full Text PDFDeep-sea cabled video-observatory provides insights into the behavior at depth of sub-adult male northern elephant seals, Mirounga angustirostris.
PLoS One
September 2024
Department of Biology, University of Victoria, Victoria, British Columbia, Canada.
The Ocean Networks Canada (ONC) cabled video-observatory at the Barkley Canyon Node (British Columbia, Canada) was recently the site of a Fish Acoustics and Attraction Experiment (FAAE), from May 21, 2022 to July 16, 2023, combining observations from High-Definition (HD) video, acoustic imaging sonar, and underwater sounds at a depth of 645 m, to examine the effects of light and bait on deep-sea fish and invertebrate behaviors. The unexpected presence of at least eight (six recurrent and two temporary) sub-adult male northern elephant seals (Mirounga angustirostris) was reported in 113 and 210 recordings out of 9737 HD and 2805 sonar videos at the site, respectively. Elephant seals were found at the site during seven distinct periods between June 22, 2022 and May 19, 2023.
View Article and Find Full Text PDFNarrowband noise induces frequency-specific underwater temporary threshold shifts in freshwater turtles.
JASA Express Lett
August 2024
Biology Department, Woods Hole Oceanographic Institution, Woods Hole, Massachusetts 02543, USA.
Freshwater turtles exhibit temporary threshold shifts (TTS) when exposed to broadband sound, but whether frequency-restricted narrowband noise induces TTS was unknown. Underwater TTS was investigated in two freshwater turtle species (Emydidae) following exposures to 16-octave narrowband noise (155-172 dB re 1 μPa2 s). While shifts occurred in all turtles at the noise center frequency (400 Hz), there were more instances of TTS and greater shift magnitudes at 12 octave above the center frequency, despite considerably lower received levels.
View Article and Find Full Text PDFNormal hearing and verbal discrimination in real sounds environments.
Acta Otorrinolaringol Esp (Engl Ed)
June 2024
Servicio de Otorrinolaringología, Hospital Clínico Universitario de Valencia, Valencia, Spain; Universidad de Valencia, Valencia, Spain.
Introduction: Human beings are constantly exposed to complex acoustic environments every day, which even pose challenges for individuals with normal hearing. Speech perception relies not only on fixed elements within the acoustic wave but is also influenced by various factors. These factors include speech intensity, environmental noise, the presence of other speakers, individual specific characteristics, spatial separatios of sound sources, ambient reverberation, and audiovisual cues.
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