Instantaneous acoustical response of marine mammals to abrupt changes in ambient noise

2014 ◽  
Vol 136 (4) ◽  
pp. 2247-2247
Author(s):  
John E. Joseph ◽  
Tetyana Margolina ◽  
Ming-Jer Huang
Keyword(s):  
Marine Mammals ◽  
Ambient Noise ◽  
Abrupt Changes

Could marine mammals use ambient noise imaging techniques?

1997 ◽  
Vol 102 (5) ◽  
pp. 3104-3104 ◽  
Author(s):  
John R. Potter ◽  
Elizabeth Taylor ◽  
Mandar Chitre
Keyword(s):  
Marine Mammals ◽  
Ambient Noise ◽  
Imaging Techniques

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 Noise Model Analysis and Estimation of Effect due to Wind Driven Ambient Noise in Shallow Water

2011 ◽  
Vol 2011 ◽  
pp. 1-4 ◽  
Author(s):  
S. Sakthivel Murugan ◽  
V. Natarajan ◽  
R. Rajesh Kumar
Keyword(s):  
Wind Speed ◽  
Marine Mammals ◽  
Ambient Noise ◽  
Signal Transmission ◽  
Acoustic Signals ◽  
Noise Spectrum ◽  
Noise Model ◽  
Frequency Range ◽  
Entire Frequency Range ◽  
Wind Speeds

Signal transmission in ocean using water as a channel is a challenging process due to attenuation, spreading, reverberation, absorption, and so forth, apart from the contribution of acoustic signals due to ambient noises. Ambient noises in sea are of two types: manmade (shipping, aircraft over the sea, motor on boat, etc.) and natural (rain, wind, seismic, etc.), apart from marine mammals and phytoplanktons. Since wind exists in all places and at all time: its effect plays a major role. Hence, in this paper, we concentrate on estimating the effects of wind. Seven sets of data with various wind speeds ranging from 2.11 m/s to 6.57 m/s were used. The analysis is performed for frequencies ranging from 100 Hz to 8 kHz. It is found that a linear relationship between noise spectrum and wind speed exists for the entire frequency range. Further, we developed a noise model for analyzing the noise level. The results of the empirical data are found to fit with results obtained with the aid of noise model.

scholarly journals Correction: Separating underwater ambient noise from flow noise recorded on stereo acoustic tags attached to marine mammals

2016 ◽  
Vol 219 (17) ◽  
pp. 2774-2774 ◽  
Author(s):  
Alexander M. von Benda-Beckmann ◽  
Paul J. Wensveen ◽  
Filipa I. P. Samarra ◽  
S. Peter Beerens ◽  
Patrick J. O. Miller
Keyword(s):  
Marine Mammals ◽  
Ambient Noise ◽  
Flow Noise ◽  
Acoustic Tags

scholarly journals Separating underwater ambient noise from flow noise recorded on stereo acoustic tags attached to marine mammals

2016 ◽  
Vol 219 (15) ◽  
pp. 2271-2275 ◽  
Author(s):  
Alexander M. von Benda-Beckmann ◽  
Paul J. Wensveen ◽  
Filipa I. P. Samarra ◽  
S. Peter Beerens ◽  
Patrick J. O. Miller
Keyword(s):  
Marine Mammals ◽  
Ambient Noise ◽  
Flow Noise ◽  
Acoustic Tags

Potential Impacts of Ambient Noise in the on Marine Mammals

2003 ◽  
Author(s):  
George Frisk ◽  
David Bradley ◽  
Jack Caldwell ◽  
Gerald D'Spain ◽  
Jonathan Gordon
Keyword(s):  
Marine Mammals ◽  
Ambient Noise

scholarly journals Lung collapse in the diving sea lion: hold the nitrogen and save the oxygen

2012 ◽  
Vol 8 (6) ◽  
pp. 1047-1049 ◽  
Author(s):  
Birgitte I. McDonald ◽  
Paul J. Ponganis
Keyword(s):  
Marine Mammals ◽  
Decompression Sickness ◽  
Dive Depth ◽  
Nitrogen Absorption ◽  
Lung Collapse ◽  
Sea Lion ◽  
California Sea Lion ◽  
Deep Diving ◽  
Air Volume ◽  
Abrupt Changes

Lung collapse is considered the primary mechanism that limits nitrogen absorption and decreases the risk of decompression sickness in deep-diving marine mammals. Continuous arterial partial pressure of oxygen profiles in a free-diving female California sea lion ( Zalophus californianus ) revealed that (i) depth of lung collapse was near 225 m as evidenced by abrupt changes in during descent and ascent, (ii) depth of lung collapse was positively related to maximum dive depth, suggesting that the sea lion increased inhaled air volume in deeper dives and (iii) lung collapse at depth preserved a pulmonary oxygen reservoir that supplemented blood oxygen during ascent so that mean end-of-dive arterial was 74 ± 17 mmHg (greater than 85% haemoglobin saturation). Such information is critical to the understanding and the modelling of both nitrogen and oxygen transport in diving marine mammals.

Acoustic Monitoring of Marine Conservation Areas

2014 ◽  
Vol 48 (6) ◽  
pp. 21-32
Author(s):  
Lisa M. Zurk ◽  
Helen H. Ou ◽  
Scott Schecklman ◽  
Ayal Lutwak
Keyword(s):  
Marine Mammals ◽  
Ambient Noise ◽  
Low Cost ◽  
Acoustic Monitoring ◽  
Marine Conservation ◽  
Conservation Areas ◽  
Passive Sensing ◽  
Long Term Trends ◽  
Events Detection ◽  
Passive Acoustic

AbstractThis paper introduces underwater sensing technologies for acoustic monitoring of marine conservation areas. Small networks of individual passive acoustic sensors have been deployed to investigate a low-cost solution for monitoring motorized vessels and marine ambient noise in large areas. A data processing package, called “Conservancy-Watch,” is introduced for environmental management and conservation of natural resources. The package includes passive sensing database creation, ambient noise monitoring to identify long-term trends and impacts, classification of organic and boat vessel events, detection of marine mammals and estimation of their call density, and detection of motorized vessels. Test results on data collected at several conservation sites in Hawaii have confirmed the detection capability of individual hydrophone sensors.

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