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  • 1
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    Listening in the ocean : new discoveries and insights on marine life from autonomous passive acoustic recorders (2016)
    New York : Springer
    Details
    Call number: 9781493931767 8 (e-book)
    Description / Table of Contents: This title brings to light the discoveries and insights into the lives of many marine species made possible over the last decade by passive acoustic recorders (PAR). Pop-ups, ARF, HARP, EAR, Bprobe, C-POD Atag, and Dtag are the acronyms of some of the many PARs that have changed our understanding of how marine animals live and strive in the ocean. Various types of PARs are used by different investigators in different areas of the world. These recorders have accumulated copious amounts of very important data, unveiling previously unknown information about large marine animals. Temporal, seasonal and spatial distribution patterns have been uncovered for many marine species. There have been many discoveries, new understandings and insights into how these animals live in and utilize the ocean and the importance of acoustics in their lives. Listening Within the Ocean summarizes these important discoveries, providing both a valuable resource for researchers and enjoyable reading for non-professionals interested in marine life.
    Type of Medium: 12
    Pages: 1 Online-Ressource (viii, 416 Seiten) , Illustrationen, Diagramme, Karten
    ISBN: 978-1-4939-3176-7 , 9781493931767
    ISSN: 2364-4915 , 2364-4923
    Series Statement: Modern acoustics and signal processing
    URL: Ebook (access only within the AWI network)
    DOI: 10.1007/978-1-4939-3176-7
    Language: English
    Note: Contents Introduction: Listening in the Ocean / Whitlow W.L. Au and Marc O. Lammers 2 A Review of Blue Whale Studies from HARUphones in the Pacific / Kathleen M. Stafford 3 Long-Term Monitoring of Cetaceans Using Autonomous Acoustic Recording Packages / Sean M. Wiggins and John A. Hildebrand 4 From Shrimp to Whales: Biological Applications of Passive Acoustic Monitoring on a Remote Pacific Coral Reef / Marc O. Lammers and Lisa M. Munger 5 Studying the Biosonar Activities of Deep Diving Odontocetes in Hawaii and Other Western Pacific Locations / Whitlow W.L. Au and Giacomo Giorli 6 Environmental Acoustic Recording System (EARS) in the Gulf of Mexico / George E. Ioup, Juliette W. Ioup, Natalia A. Sidorovskaia, Christopher O. Tiemann, Stan A. Kuczaj, Azmy S. Ackleh, Joal J. Newcomb, Baoling Ma, Robin Paulos, Alexander Ekimov, Grayson H. Rayborn Jr., James M. Stephens, and Arslan M. Tashmukhambetov 7 Listening to Echolocation Clicks with PODs / Nick Tregenza, Steve Dawson, Will Rayment, and Ursula Verfuss 8 PALAOA: The Perennial Acoustic Observatory in the Antarctic Ocean—Real- Time Eavesdropping on the Antarctic Underwater Soundscape / Holger Klinck, Lars Kindermann, and Olaf Boebel 9 Listening for Whales at the Station ALOHA Cabled Observatory / Julie N. Oswald, Helen Ou, Whitlow W.L. Au, Bruce M. Howe, and Fred Duennebier 10 Findings from U.S. Navy Hydrophone Ranges / David Moretti, Ronald Morrissey, Susan Jarvis, and Jessica Shaffer 11 Pinniped Sounds in the Polar Oceans / Jennifer L. Miksis-Olds, Ilse C. Van Opzeeland, Sofie M. Van Parijs, and Joshua Jones 12 Listening in the Ocean: New Discoveries and Insights on Marine Life from Autonomous Passive Acoustic Recorders / David Mann, James Locascio, and Carrie Wall 13 Passive Acoustic Monitoring in Benthic Marine Crustaceans: A New Research Frontier / Erica Staaterman 14 A Multiplatform Ultrasonic Event Recorder for Tagging, Towing, and Stationed Monitoring of Odontocetes / Tomonari Akamatsu 15 Signal Processing / David K. Mellinger, Marie A. Roch, Eva-Marie Nosal, and Holger Klinck Index
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    E-BOOK
  • 2
    Electronic Resource
    Electronic Resource
    A PORTABLE BROADBAND DATA ACQUISITION SYSTEM FOR FIELD STUDIES IN BIOACOUSTICS (1999)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 15 (1999), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.1999.tb00817.x
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  • 3
    Electronic Resource
    Electronic Resource
    SEASONAL AND DIURNAL TRENDS OF CHORUSING HUMPBACK WHALES WINTERING IN WATERS OFF WESTERN MAUI (2000)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 16 (2000), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A portable data logger controlled by a Tattletale 7 microcontroller was used to record humpback whale choruses during the 1998 humpback whale winter season in Hawaii. The data logger sampled the sounds for four minutes every half hour using a digitizing rate of 2 kHz, and the data were stored on a hard disk. The results between January and April showed a peak in the sound pressure level between mid-February and mid-March. This peak of approximately 120 dB re 1 μPa coincided with the peak in the number of whales sighted by aerial survey on 7 March 1998. The choruses had spectral peaks at 315 Hz and 630 Hz. Some of the sounds at 630 Hz were second harmonics of the 315 Hz peak and others were not. The data also indicated a diurnal pattern in the sound pressure level, with levels at night significantly louder than the daytime levels. The sound levels began to increase during sunset and remained relatively high until sunrise, when they progressively decreased to a minimum. The nighttime peak occurred within an hour before and after midnight, and the daytime minimum occurred between 1100 and 1500. That more humpback whales appear to sing at night may reflect a switch to sexual advertisement as the primary male mating strategy at this time. It may also indicate that daylight and vision play key roles in the formation of competitive groups. It is suggested that the relative number of humpback whales in a given locale may be estimated by monitoring changes in sound pressure levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2000.tb00949.x
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  • 4
    Electronic Resource
    Electronic Resource
    DIRECTIONALITY IN THE WHISTLES OF HAWAIIAN SPINNER DOLPHINS (STENELLA LONGIROSTRIS): A SIGNAL FEATURE TO CUE DIRECTION OF MOVEMENT? (2003)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 19 (2003), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Dolphins produce frequency modulated (FM) whistles that are thought to promote the synchrony and coordination of behavior between members of a group. How whistles are used in this regard remains poorly understood. One possibility is that whistles have directionality and thereby convey the orientation and direction of movement of the signaler to nearby listeners. To explore this possibility, whistles from free-ranging Hawaiian spinner dolphins (Stenella longirostris) were obtained using a towed, three-hydrophone line array and examined for the presence of directionality. Both the estimated source level and harmonic content of whistles produced by animals traveling with or toward the array were greater than those of animals moving ahead or away from it. In addition, signals produced by animals near the array (within 20 m) were received differently on the three hydrophones spaced 11.5 m apart. These differences were greater than would be expected from transmission loss disparities alone. The results indicate that directivity is present in the transmission pattern of whistles. To infer the form of this directivity, a theoretical whistle beam pattern was established based on the assumption that the dolphin's sound source is approximated by a circular piston transducer (Au 1993). The resulting beam indicates that spinner dolphin whistles become increasingly directional with frequency, especially with respect to harmonics. The orientation-dependent harmonic structure of whistles thus presents a potential cue that listening animals could interpret to infer the direction of movement of signalers. Harmonics are present in the whistles of many dolphin species and may represent an inherent signal design feature that promotes coordination between animals.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2003.tb01107.x
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  • 5
    Electronic Resource
    Electronic Resource
    TEMPORARY THRESHOLD SHIFTS AFTER NOISE EXPOSURE IN THE BOTTLENOSE DOLPHIN (TURSIOPS TRUNCATUS) MEASURED USING EVOKED AUDITORY POTENTIALS (2004)
    Oxford, UK : Blackwell Publishing Ltd
    Marine mammal science 20 (2004), S. 0 
    Details
    ISSN: 1748-7692
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The time course of recovery from temporary threshold shift (TTS) was measured in a bottlenose dolphin, Tursiops truncatus, using an evoked-potential procedure. The envelope-following response (EFR), which is a rhythmic train of auditory brainstem responses (ABR) to sinusoidally amplitude-modulated tones, was used as an indicator of the sound reception by the animal. Variation of the intensity of the stimulus allowed us to measure the animal's hearing via EFR thresholds. During each session, following an initial measure of threshold, the trained animal voluntary positioned itself within a hoop 1 m underwater while a 160 dB re 1 μPa noise of a 4–11 kHz bandwidth was presented for 30 min. After the noise exposure, thresholds were measured again at delays of 5, 10, 15, 25, 45, and 105 min. Measurements were made at test frequencies of 8, 11.2, 16, 22.5, and 32 kHz. The maximum TTS occurred 5 min after exposure and rapidly recovered with a rate of around 1.5 dB per doubling of time. TTS occurred at test frequencies from 8 to 16 kHz, with the maximum at 16 kHz. TTS was negligible at 22.5 kHz and absent at 32 kHz.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1748-7692.2004.tb01187.x
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  • 6
    Electronic Resource
    Electronic Resource
    Automatic gain control in the echolocation system of dolphins (2003)
    [s.l.] : Macmillian Magazines Ltd.
    Nature 423 (2003), S. 861-863 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] In bats and technological sonars, the gain of the receiver is progressively increased with time after the transmission of a signal to compensate for acoustic propagation loss. The current understanding of dolphin echolocation indicates that automatic gain control is not a part of their sonar ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/nature01727
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  • 7
    Electronic Resource
    Electronic Resource
    A comparison of signal detection between an echolocating dolphin and an optimal receiver (1989)
    Springer
    Journal of comparative physiology 164 (1989), S. 451-458 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary An electronic simulated target apparatus was used in a two-experiment study to compare the target detection performance of an echolocating bottlenose dolphin with an optimal receiver. Random Gaussian noise with a relatively flat spectrum from 20 to 160 kHz was used as a masking source. Experiment I was conducted to establish a technique for estimating the echo energy-to-noise ratio,E e /N, at the dolphin's threshold of detection. Dolphins typically vary the amplitude of their emitted signal over a large range making it difficult to estimateE e /N. In the first part of experiment I, the simulated echo was a double click, the pulses separated by 200 μs, with each pulse being a replica of the dolphin's transmitted signal. A staircase psychophysical procedure was used to obtain the detection threshold, and the echo energy-to-noise ratio based on the highest amplitude click emitted per trial, (E e /N)max, was determined at each reversal point. The second echo type consisted of one of the animal's echolocation clicks, previously measured, digitized and stored in an erasable programmable read-only memory (EPROM). The electronic target simulator was modified so that every time the dolphin emitted an echolocation signal, the EPROM was triggered to produce two pulses separated by 200 μs. On any trial, the EPROM signal was played back at a fixed amplitude, regardless of the amplitude of the dolphin's emitted signal. TheE e /N obtained with the EPROM signal at threshold was found to be 2.9 dB lower than (E e /N)max obtained with the normal phantom target. Therefore an estimate ofE e /N can be obtained by subtracting 2.9 dB from (E e /N)max. Experiment II was conducted to obtain isosensitivity data that could be plotted in an ROC (receiver operating characteristic) format. The response bias of the dolphin was manipulated by varying the food reinforcement payoff matrix. In terms of the ratio of correct detections to correct rejections, the payoff matrix was varied over four values: 1∶1, 4∶1, 8∶1, and 1∶4. A modified method of constants procedure was used to obtain the dolphin target detection performance data. Each session consisted of two 20-trial blocks in which a strong echo was used in the first block and a weak echo in the second block. The energy-to-noise ratio required by an optimal detector to approximate the dolphin's performance was obtained by determining the appropriate detection sensitivity,d′, that best fitted the dolphin's data plotted in an ROC format. The results of experiment II indicated that the dolphin required approximately 7.4 dB higherE e /N than an optimal detector to detect the phantom target.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00610439
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  • 8
    Electronic Resource
    Electronic Resource
    Cylinder wall thickness difference discrimination by an echolocating Atlantic bottlenose dolphin (1992)
    Springer
    Journal of comparative physiology 170 (1992), S. 41-47 
    Details
    ISSN: 1432-1351
    Keywords: Thickness difference discrimination ; Echolocation ; Bottlenose dolphin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The capability of an Atlantic bottlenose dolphin Tursiops truncatus to discriminate wall thickness differences of hollow cylinders by echolocation was studied. A standard cylinder of 6.35 mm wall thickness was compared with cylinders having wall thicknesses that differed from the standard by ± 0.2, ± 0.3, ± 0.4, and ± 0.8 mm. All cylinders had an O.D. of 37.85 mm, and a length of 12.7 cm. The dolphin was required to station in a hoop while the standard and comparison targets, separated by an angle of ± 11° from a center line, were simultaneously presented at a range of 8 m. The dolphin was required to echolocate and indicate the side of the standard target. Target location on each trial was randomized. Interpolation of the dolphin performance data indicated a wall thickness discrimination threshold (at the 75% correct response level) of −0.23 mm and +0.27 mm. Backscatter measurements suggest that if the dolphin used time domain echo cues, it may be able to detect time differences between two echo highlights to within approximately ± 500 ns. If frequency domain cues were used, the dolphin may be able to detect frequency shifts as small as 3 kHz in a broadband echo having a center frequency of approximately 110 kHz. Finally, if the dolphin used time-separation pitch (TSP) cues, it may be able to detect TSP differences of approximately 450 Hz. Discrimination tests with the thinner comparison targets were also conducted in the presence of broadband masking noise. For an echo energy-to-noise ratio of 19 dB the dolphin's performance was comparable to its noise-free performance. At an energy-to-noise ratio of 14 dB the dolphin was unable to achieve the 75% correct threshold with any of the comparison targets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00190399
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  • 9
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    Common humpback whale (Megaptera novaeangliae) sound types for passive acoustic monitoring (2011)
    Acoustical Society of America
    Details
    Publication Date: 2022-05-25
    Description: Author Posting. © Acoustical Society of America, 2011. This article is posted here by permission of Acoustical Society of America for personal use, not for redistribution. The definitive version was published in Journal of the Acoustical Society of America 129 (2011): 476-482, doi:10.1121/1.3504708.
    Description: Humpback whales (Megaptera novaeangliae) are one of several baleen whale species in the Northwest Atlantic that coexist with vessel traffic and anthropogenic noise. Passive acoustic monitoring strategies can be used in conservation management, but the first step toward understanding the acoustic behavior of a species is a good description of its acoustic repertoire. Digital acoustic tags (DTAGs) were placed on humpback whales in the Stellwagen Bank National Marine Sanctuary to record and describe the non-song sounds being produced in conjunction with foraging activities. Peak frequencies of sounds were generally less than 1 kHz, but ranged as high as 6 kHz, and sounds were generally less than 1 s in duration. Cluster analysis distilled the dataset into eight groups of sounds with similar acoustic properties. The two most stereotyped and distinctive types (“wops” and “grunts”) were also identified aurally as candidates for use in passive acoustic monitoring. This identification of two of the most common sound types will be useful for moving forward conservation efforts on this Northwest Atlantic feeding ground.
    Description: This paper was funded by the National Oceanic and Atmospheric Administration (NOAA)’s National Marine Sanctuaries Program. It was also sponsored in part by the University of Hawaii Sea Grant College Program, School of Ocean and Earth Science and Technology, under Institutional Grant No. NA05OAR4171048 from the NOAA Office of Sea Grant, Department of Commerce.
    Keywords: Bioacoustics ; Biocommunications ; Underwater sound
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 10
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    Biosonar signal propagation in the harbor porpoise's (Phocoena phocoena) head : the role of various structures in the formation of the vertical beam (2017)
    Acoustical Society of America
    Details
    Publication Date: 2022-05-25
    Description: © The Author(s), 2017. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Journal of the Acoustical Society of America 141 (2017): 4179–4187, doi: 10.1121/1.4983663.
    Description: Harbor porpoises (Phocoena phocoena) use narrow band echolocation signals for detecting and locating prey and for spatial orientation. In this study, acoustic impedance values of tissues in the porpoise's head were calculated from computer tomography (CT) scan and the corresponding Hounsfield Units. A two-dimensional finite element model of the acoustic impedance was constructed based on CT scan data to simulate the acoustic propagation through the animal's head. The far field transmission beam pattern in the vertical plane and the waveforms of the receiving points around the forehead were compared with prior measurement results, the simulation results were qualitatively consistent with the measurement results. The role of the main structures in the head such as the air sacs, melon and skull in the acoustic propagation was investigated. The results showed that air sacs and skull are the major components to form the vertical beam. Additionally, both beam patterns and sound pressure of the sound waves through four positions deep inside the melon were demonstrated to show the role of the melon in the biosonar sound propagation processes in the vertical plane.
    Description: This work was financially supported in part by the National Science Foundation of China (Grant Nos. 41276040, 11174240, 31170501, and 31070347), the Natural Science Foundation of Fujian Province of China (Grant No. 2012J06010), Ministry of Science and Technology of China (Grant No. 2011BAG07B05-3) and State Oceanic Administration of China (Grant No. 201105011-3). The Project was sponsored by the Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry.
    Repository Name: Woods Hole Open Access Server
    Type: Article
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