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.

Seasonal presence of cetaceans and ambient noise levels in polar waters of the North Atlantic

2012 ◽  
Vol 132 (3) ◽  
pp. EL176-EL181 ◽  
Author(s):  
Holger Klinck ◽  
Sharon L. Nieukirk ◽  
David K. Mellinger ◽  
Karolin Klinck ◽  
Haruyoshi Matsumoto ◽  
...  
Keyword(s):  
North Atlantic ◽  
Ambient Noise ◽  
Noise Levels ◽  
The North ◽  
The North Atlantic

Whistling in a noisy ocean: bottlenose dolphins adjust whistle frequencies in response to real-time ambient noise levels

Bioacoustics ◽  
2017 ◽  
Vol 27 (4) ◽  
pp. 391-405 ◽  
Author(s):  
Chantal van Ginkel ◽  
Danielle M. Becker ◽  
Shannon Gowans ◽  
Peter Simard
Keyword(s):  
Real Time ◽  
Ambient Noise ◽  
Bottlenose Dolphins ◽  
Noise Levels

Variability in ambient noise levels and call parameters of North Atlantic right whales in three habitat areas

2009 ◽  
Vol 125 (2) ◽  
pp. 1230-1239 ◽  
Author(s):  
Susan E. Parks ◽  
Ildar Urazghildiiev ◽  
Christopher W. Clark
Keyword(s):  
North Atlantic ◽  
Ambient Noise ◽  
Noise Levels ◽  
Right Whales ◽  
North Atlantic Right Whales

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 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.

Seasonal ambient noise levels and impacts on communication in the North Atlantic right whale

2006 ◽  
Vol 120 (5) ◽  
pp. 3266-3266
Author(s):  
Susan E. Parks ◽  
Christopher W. Clark ◽  
Kathryn A. Cortopassi ◽  
Dimitri Ponirakis
Keyword(s):  
North Atlantic ◽  
Ambient Noise ◽  
Noise Levels ◽  
North Atlantic Right Whale ◽  
Right Whale ◽  
The North ◽  
The North Atlantic

scholarly journals Sounds of Stress: Assessment of Relationships between Ambient Noise, Vessel Traffic, and Gray whale Stress Hormone

2021 ◽  
Author(s):  
Leila S. Lemos ◽  
Joseph H. Haxel ◽  
Amy Olsen ◽  
Jonathan D. Burnett ◽  
Angela Smith ◽  
...  
Keyword(s):  
Ambient Noise ◽  
Anthropogenic Activities ◽  
Gray Whale ◽  
Sample Collection ◽  
Noise Levels ◽  
Baleen Whales ◽  
Individual Level ◽  
Ocean Noise ◽  
Metabolite Concentrations ◽  
The Individual

Abstract Elevated noise from human activities in nature can impact animal behavior and physiology, with subsequent impacts on individual health and population dynamics. Baleen whale communication, navigation, habitat use, and ability to recognize and locate prey and predators may be impaired by anthropogenic activities that increase ocean noise within the whales' hearing frequency range. To understand the physiological impacts of noise disturbance on baleen whales, we investigated the adrenal stress response of gray whales (Eschrichtius robustus) to variable ambient noise levels through an assessment of fecal glucocorticoid metabolite concentrations. This analysis was conducted at the individual level, at multiple temporal scales (1-7 days), and accounted for factors that may confound glucocorticoid hormone concentrations: sex, age, nutritional status, and reproductive state. Data were collected along the Oregon coast, USA, from June to October of 2016-2018. Results indicate a significant positive correlation between underwater noise levels and vessel traffic. Vessel counts from the day prior to fecal sample collection and sex had significant positive relationships with glucocorticoid metabolite concentrations. This study increases knowledge of gray whale physiological response to variable ocean noise and may inform management decisions regarding regulations of anthropogenic noise activities and thresholds near critical whale habitats.

scholarly journals Mitogenomics of the endangered Mediterranean monk seal (Monachus monachus) reveals dramatic loss of diversity and supports historical gene-flow between Atlantic and eastern Mediterranean populations

2020 ◽  
Author(s):  
Alba Rey-Iglesia ◽  
Philippe Gaubert ◽  
Gonçalo Espregueira Themudo ◽  
Rosa Pires ◽  
Constanza De La Fuente ◽  
...  
Keyword(s):  
Genetic Diversity ◽  
Gene Flow ◽  
North Atlantic ◽  
Marine Mammals ◽  
Eastern Mediterranean ◽  
The Black Sea ◽  
Mediterranean Populations ◽  
Geographic Ranges ◽  
Western Sahara ◽  
The Mediterranean

Abstract The Mediterranean monk seal Monachus monachus is one of the most threatened marine mammals, with only 600–700 individuals restricted to three populations off the coast of Western Sahara and Madeira (North Atlantic) and between Greece and Turkey (eastern Mediterranean). Its original range was from the Black Sea (eastern Mediterranean) to Gambia (western African coast), but was drastically reduced by commercial hunting and human persecution since the early stages of marine exploitation. We here analyse 42 mitogenomes of Mediterranean monk seals, from across their present and historical geographic ranges to assess the species population dynamics over time. Our data show a decrease in genetic diversity in the last 200 years. Extant individuals presented an almost four-fold reduction in genetic diversity when compared to historical specimens. We also detect, for the first time, a clear segregation between the two North Atlantic populations, Madeira and Cabo Blanco, regardless of their geographical proximity. Moreover, we show the presence of historical gene-flow between the two water basins, the Atlantic Ocean and the Mediterranean Sea, and the presence of at least one extinct maternal lineage in the Mediterranean. Our work demonstrates the advantages of using full mitogenomes in phylogeographic and conservation genomic studies of threatened species.

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