scholarly journals The Lombard effect in singing humpback whales: Source levels increase as ambient ocean noise levels increase

2020 ◽  
Vol 148 (2) ◽  
pp. 542-555 ◽  
Author(s):  
Regina A. Guazzo ◽  
Tyler A. Helble ◽  
Gabriela C. Alongi ◽  
Ian N. Durbach ◽  
Cameron R. Martin ◽  
...  
Keyword(s):  
Humpback Whales ◽  
Noise Levels ◽  
Lombard Effect ◽  
Ocean Noise

The Lombard effect in humpback whales

2012 ◽  
Vol 131 (4) ◽  
pp. 3456-3456 ◽  
Author(s):  
Michael Noad ◽  
Rebecca Dunlop ◽  
Douglas Cato
Keyword(s):  
Humpback Whales ◽  
Lombard Effect

A simple ocean noise exposure metric based on naturally occurring noise levels and biological thresholds

2007 ◽  
Vol 122 (5) ◽  
pp. 3002
Author(s):  
Michael Stocker ◽  
Tom Reuterdahl ◽  
Libbie Horn ◽  
Gail Hurley
Keyword(s):  
Noise Exposure ◽  
Noise Levels ◽  
Naturally Occurring ◽  
Ocean Noise

scholarly journals Dolphins simplify their vocal calls in response to increased ambient noise

2018 ◽  
Vol 14 (10) ◽  
pp. 20180484 ◽  
Author(s):  
Leila Fouda ◽  
Jessica E. Wingfield ◽  
Amber D. Fandel ◽  
Aran Garrod ◽  
Kristin B. Hodge ◽  
...  
Keyword(s):  
North Atlantic ◽  
Marine Mammals ◽  
Ambient Noise ◽  
Bottlenose Dolphins ◽  
Marine Species ◽  
Individual Identification ◽  
Noise Levels ◽  
Acoustic Feature ◽  
Ocean Noise ◽  
Anthropogenic Processes

Ocean noise varies spatially and temporally and is driven by natural and anthropogenic processes. Increased ambient noise levels can cause signal masking and communication impairment, affecting fitness and recruitment success. However, the effects of increasing ambient noise levels on marine species, such as marine mammals that primarily rely on sound for communication, are not well understood. We investigated the effects of concurrent ambient noise levels on social whistle calls produced by bottlenose dolphins ( Tursiops truncatus ) in the western North Atlantic. Elevated ambient noise levels were mainly caused by ship noise. Increases in ship noise, both within and below the dolphins' call bandwidth, resulted in higher dolphin whistle frequencies and a reduction in whistle contour complexity, an acoustic feature associated with individual identification. Consequently, the noise-induced simplification of dolphin whistles may reduce the information content in these acoustic signals and decrease effective communication, parent–offspring proximity or group cohesion.

scholarly journals A key to quieter seas: half of ship noise comes from 15% of the fleet

2018 ◽  
Author(s):  
Scott Veirs ◽  
Val Veirs ◽  
Rob Williams ◽  
Michael Jasny ◽  
Jason Wood
Keyword(s):  
Low Frequency ◽  
Noise Pollution ◽  
Marine Species ◽  
International Maritime Organization ◽  
Total Power ◽  
Underwater Noise ◽  
Noise Levels ◽  
Management Options ◽  
Ocean Noise ◽  
Wide Range

Underwater noise pollution from ships is a chronic, global stressor impacting a wide range of marine species. Ambient ocean noise levels nearly doubled each decade from 1963-2007 in low-frequency bands attributed to shipping, inspiring a pledge from the International Maritime Organization to reduce ship noise and a call from the International Whaling Commission for member nations to halve ship noise within a decade. Our analysis of data from 1,582 ships reveals that half of the total power radiated by a modern fleet comes from just 15% of the ships, namely those with source levels above 179 dB re 1 μPa @ 1 m. We present a range of management options for reducing ship noise efficiently, including incentive-based programs, without necessarily regulating the entire fleet.

scholarly journals Effect on Ocean Noise: Nyepi, a Balinese Day of Silence

2018 ◽  
Author(s):  
Rob Williams ◽  
Christine Erbe ◽  
I Made Iwan Dewantama ◽  
I Gede Hendrawan
Keyword(s):  
Coral Reef ◽  
Coral Reef Fish ◽  
Human Activities ◽  
Killer Whale ◽  
Acoustic Noise ◽  
Acoustic Signals ◽  
Shallow Waters ◽  
Noise Levels ◽  
Sonar System ◽  
Ocean Noise

Taking advantage of a religious holiday called Nyepi that curtailed human activities for one day, we recorded acoustic noise levels for one week in shallow waters of a little-trafficked area west of Bali below the Ngurah Rai airport flight path (Figure 1). Sound is as important to many marine organisms as vision is to humans. From the song of the humpback whale to the exquisite sonar system of the killer whale, many marine vertebrates have evolved sophisticated systems for sending and receiving acoustic signals to facilitate vital life functions. Coral reef fish sing in a dawn chorus, much as songbirds do (McCauley and Cato, 2000).

Measurement and prediction of speech and noise levels and the Lombard effect in eating establishments

2007 ◽  
Vol 121 (4) ◽  
pp. 2023-2033 ◽  
Author(s):  
Murray Hodgson ◽  
Gavin Steininger ◽  
Zohreh Razavi
Keyword(s):  
Noise Levels ◽  
Lombard Effect

scholarly journals A key to quieter seas: half of ship noise comes from 15% of the fleet

2018 ◽  
Author(s):  
Scott Veirs ◽  
Val Veirs ◽  
Rob Williams ◽  
Michael Jasny ◽  
Jason Wood
Keyword(s):  
Low Frequency ◽  
Noise Pollution ◽  
Marine Species ◽  
International Maritime Organization ◽  
Total Power ◽  
Underwater Noise ◽  
Noise Levels ◽  
Management Options ◽  
Ocean Noise ◽  
Wide Range

Underwater noise pollution from ships is a chronic, global stressor impacting a wide range of marine species. Ambient ocean noise levels nearly doubled each decade from 1963-2007 in low-frequency bands attributed to shipping, inspiring a pledge from the International Maritime Organization to reduce ship noise and a call from the International Whaling Commission for member nations to halve ship noise within a decade. Our analysis of data from 1,582 ships reveals that half of the total power radiated by a modern fleet comes from just 15% of the ships, namely those with source levels above 179 dB re 1 μPa @ 1 m. We present a range of management options for reducing ship noise efficiently, including incentive-based programs, without necessarily regulating the entire fleet.

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