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  • 1
    Online Resource
    Online Resource
    A disproportion in bowhead whale call counts around an acoustic array during the fall 2012 migration in the Chukchi Sea, Alaska: An investigation into the potential of acoustic masking
    Acoustical Society of America (ASA) ; 2013
    In:  The Journal of the Acoustical Society of America Vol. 134, No. 5_Supplement ( 2013-11-01), p. 4148-4148
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 134, No. 5_Supplement ( 2013-11-01), p. 4148-4148
    Abstract: A long-term passive acoustic study in the Chukchi Sea monitors the bowhead whale (Balaena mysticetus) migration between their summering and wintering grounds in the Beaufort and Bering Seas, respectively. A hexagonal array offshore from Point Lay, AK was located near the center of their migratory corridor in the falls of 2009 through 2011. In 2012 however, there was a large difference in the number of acoustic detections across the array, with call counts close to three times higher in its northwest section compared to its southeast. An increase in vessel traffic in the area resulted in higher ambient noise conditions for much of the summer. This paper investigates the possibility of acoustic masking of calls due to this increase in background noise levels.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4831205
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2013
    detail.hit.zdb_id: 1461063-2
    detail.hit.zdb_id: 219231-7
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  • 2
    Online Resource
    Online Resource
    Underwater acoustic behavior of bearded seals ( Erignathus barbatus ) in the northeastern Chukchi Sea, 2007–2010
    Wiley ; 2016
    In:  Marine Mammal Science Vol. 32, No. 1 ( 2016-01), p. 141-160
    Details
    In: Marine Mammal Science, Wiley, Vol. 32, No. 1 ( 2016-01), p. 141-160
    Abstract: Bearded seal ( Erignathus barbatus ) calls were recorded using autonomous passive acoustic recorders deployed in the northeastern Chukchi Sea between October 2007 and October 2010. Continuous acoustic data were acquired during summer (August to mid‐October), and overwinter data (mid‐October through July) were acquired on a duty cycle of 40/48 min every 4 h. We investigated the spatio‐temporal distribution and acoustic behavior of vocalizing bearded seals in this multiyear data set. Peaks in calling occurred in spring, coinciding with the mating period, and calls stopped abruptly in late June/early July. Fewer calls were detected in summer, and the vocal presence of seals increased with the formation of pack ice in winter. Vocal activity was higher at night than during the day, with a peak around 0400 ( AKST ). Monthly patterns in proportional use of each call type and call duration were examined for the first time. The proportion and duration of AL 1(T) and AL 2(T) call types increased during the mating period, suggesting that males advertise their breeding condition by producing those specific longer trills. The observed seasonal and diel trends were consistent between years. These results improve our understanding of occurrence and acoustic behavior of bearded seals across the northeastern Chukchi Sea.
    Type of Medium: Online Resource
    ISSN: 0824-0469 , 1748-7692
    URL: Issue
    URL: Article
    DOI: 10.1111/mms.2016.32.issue-1
    DOI: 10.1111/mms.12246
    Language: English
    Publisher: Wiley
    Publication Date: 2016
    detail.hit.zdb_id: 12787-5
    detail.hit.zdb_id: 2218018-7
    SSG: 12
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  • 3
    Online Resource
    Online Resource
    Acoustic occurrence and behavior of ribbon seals (Histriophoca fasciata) in the Bering, Chukchi, and Beaufort seas
    Springer Science and Business Media LLC ; 2019
    In:  Polar Biology Vol. 42, No. 4 ( 2019-4), p. 657-674
    Details
    In: Polar Biology, Springer Science and Business Media LLC, Vol. 42, No. 4 ( 2019-4), p. 657-674
    Type of Medium: Online Resource
    ISSN: 0722-4060 , 1432-2056
    URL: Article
    DOI: 10.1007/s00300-019-02462-y
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 1478942-5
    detail.hit.zdb_id: 584850-7
    SSG: 12
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  • 4
    Online Resource
    Online Resource
    Acoustic and visual cetacean surveys reveal year-round spatial and temporal distributions for multiple species in northern British Columbia, Canada
    Springer Science and Business Media LLC ; 2022
    In:  Scientific Reports Vol. 12, No. 1 ( 2022-11-10)
    Details
    In: Scientific Reports, Springer Science and Business Media LLC, Vol. 12, No. 1 ( 2022-11-10)
    Abstract: Cetaceans spend most of their time below the surface of the sea, highlighting the importance of passive acoustic monitoring as a tool to facilitate understanding and mapping their year-round spatial and temporal distributions. To increase our limited knowledge of cetacean acoustic detection patterns for the east and west coasts of Gwaii Haanas, a remote protected area on Haida Gwaii, BC, Canada, acoustic datasets recorded off SG̱ang Gwaay (Sep 2009–May 2011), Gowgaia Slope (Jul 2017–Jul 2019), and Ramsay Island (Aug 2018–Aug 2019) were analyzed. Comparing overlapping periods of visual surveys and acoustic monitoring confirmed presence of 12 cetacean species/species groups within the study region. Seasonal patterns were identified for blue, fin, humpback, grey and sperm whale acoustic signals. Killer whale and delphinid acoustic signals occurred year-round on both coasts of Haida Gwaii and showed strong diel variation. Cuvier’s, Baird’s, beaked whale and porpoise clicks, were identified in high-frequency recordings on the west coast. Correlations between environmental factors, chlorophyll-a and sea surface temperature, and cetacean acoustic occurrence off Gwaii Haanas were also examined. This study is the first to acoustically monitor Gwaii Haanas waters for an extended continuous period and therefore serves as a baseline from which to monitor future changes.
    Type of Medium: Online Resource
    ISSN: 2045-2322
    URL: Article
    DOI: 10.1038/s41598-022-22069-4
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2022
    detail.hit.zdb_id: 2615211-3
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  • 5
    Online Resource
    Online Resource
    Bowhead whale year-round acoustic presence and habitat associations in the Amundsen Gulf, Western Canadian Arctic, 2018–2019
    Elsevier BV ; 2023
    In:  Progress in Oceanography Vol. 213 ( 2023-04), p. 103004-
    Details
    In: Progress in Oceanography, Elsevier BV, Vol. 213 ( 2023-04), p. 103004-
    Type of Medium: Online Resource
    ISSN: 0079-6611
    URL: Article
    DOI: 10.1016/j.pocean.2023.103004
    RVK:
    RB 10402
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2023
    detail.hit.zdb_id: 4062-9
    SSG: 21,3
    SSG: 14
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  • 6
    Online Resource
    Online Resource
    Marine mammal acoustic detections in the northeastern Chukchi Sea, September 2007–July 2011
    Elsevier BV ; 2013
    In:  Continental Shelf Research Vol. 67 ( 2013-09), p. 127-146
    Details
    In: Continental Shelf Research, Elsevier BV, Vol. 67 ( 2013-09), p. 127-146
    Type of Medium: Online Resource
    ISSN: 0278-4343
    URL: Article
    DOI: 10.1016/j.csr.2013.07.009
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2013
    detail.hit.zdb_id: 780256-0
    SSG: 13
    SSG: 14
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  • 7
    Online Resource
    Online Resource
    Monitoring haddock in the Stellwagen Bank National Marine Sanctuary using passive acoustics
    Acoustical Society of America (ASA) ; 2023
    In:  The Journal of the Acoustical Society of America Vol. 154, No. 4_supplement ( 2023-10-01), p. A315-A315
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 154, No. 4_supplement ( 2023-10-01), p. A315-A315
    Abstract: Haddock (Melanogrammus aeglefinus) are important commercial resources in the western North Atlantic. Their distribution ranges from Newfoundland to North Carolina and are most abundant on Georges Bank and in the Gulf of Maine. Over the course of a decade, the Gulf of Maine warmed faster than 99% of the global ocean and these changes are likely to impact the distribution and reproduction of haddock. It is therefore increasingly important to closely monitor this species and ensure a sustainable fishery. The objective of this study is to monitor the spatial and temporal occurrence of haddock using the sound they produce. We manually annotated over 20 000 haddock calls at five different sites and four different years and used them to train a convolutional neural network that can automatically detect haddock calls in acoustic recordings. The detector was then used to analyze several months of passive acoustic data collected in the Stellwagen Bank National Marine Sanctuary. The analysis revealed that haddock calls were mostly detected during the spawning season (January to March) but were also detected as late as August. We discuss how passive acoustics can complement existing monitoring methods and support the management of this commercially and ecologically important species.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0023648
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2023
    detail.hit.zdb_id: 1461063-2
    detail.hit.zdb_id: 219231-7
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  • 8
    Online Resource
    Online Resource
    Comparison of three portable volumetric arrays to localize and identify fish sounds in the wild
    Acoustical Society of America (ASA) ; 2022
    In:  The Journal of the Acoustical Society of America Vol. 151, No. 4_Supplement ( 2022-04-01), p. A148-A148
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 151, No. 4_Supplement ( 2022-04-01), p. A148-A148
    Abstract: We describe three portable volumetric audio/video arrays capable of identifying species-specific fish sounds in the wild. Each array can record fish sounds, acoustically localize the fish in three-dimensions (using linearized or fully non-linear inversion), and record video to identify the species and observe their behavior. The design of each array accommodates specific logistical and financial constraints, covering a range of nearshore habitats and applications. The first platform is composed of six hydrophones, an acoustic recorder, and two video cameras secured to a 2 × 2 × 3 m PVC frame. Hydrophone placement is defined using simulated annealing to maximize localization accuracy. The second platform uses a single video camera, four hydrophones, and an acoustic recorder on a one cubic meter PVC frame. It can be deployed on heterogeneous substrates but has lower localization capabilities. The third platform consists of four hydrophones connected to an acoustic recorder mounted on a tethered underwater drone with built-in video. It allows remote control and real-time positioning in response to observed fish presence but with reduced localization capabilities. The three platforms were deployed off British Columbia, Canada, and used to identify and characterize new sounds from quillback rockfish, copper rockfish, and lingcod.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0010929
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2022
    detail.hit.zdb_id: 1461063-2
    detail.hit.zdb_id: 219231-7
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  • 9
    Online Resource
    Online Resource
    Real-time acoustic monitoring and source level estimates of walruses in the northeastern Chukchi Sea using particle velocity sensors
    Acoustical Society of America (ASA) ; 2014
    In:  The Journal of the Acoustical Society of America Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2361-2361
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 135, No. 4_Supplement ( 2014-04-01), p. 2361-2361
    Abstract: Particle motion sensors measure the vector component of the sound field. In underwater acoustics, they are used for studying the physics of the sound field, evaluating the potential effects of sound on fish, and defining the direction of arrival (DOA) of sound sources. Measuring the DOA in the vertical and horizontal plane allows two separate receivers to localize an acoustic source in three dimensions. In July 2013, we used two custom-built, real-time particle velocity acoustic recording systems to record and localize vocally active walruses in the water near groups hauled out on ice in the northeastern Chukchi Sea. The system was equipped with a three-axis dipole sensors and a calibrated omni-directional hydrophone. It was deployed at the water surface and transmitted data in real-time to a support skiff. The range between the recorders, support skiff, and calling animals was usually less than 200 m and typically within a few tens of meters, allowing for simultaneous visual observations. Calling walruses were localized using cross-fixes of acoustic bearings. Source levels were estimated by adding modeled frequency-dependent transmission losses to the received levels in each 1/3-octave-band obtained from the calibrated omni-directional hydrophone. Only calls with high signal-to-noise ratio were used in this analysis. The use of the particle velocity sensor allowed for the first source level measurements of walrus grunts and bell calls in the wild.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4877780
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2014
    detail.hit.zdb_id: 1461063-2
    detail.hit.zdb_id: 219231-7
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  • 10
    Online Resource
    Online Resource
    Two-dimensional localization of walruses in shallow water using a ray-tracing model.
    Acoustical Society of America (ASA) ; 2011
    In:  The Journal of the Acoustical Society of America Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2574-2574
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2574-2574
    Abstract: Pacific Walruses summering in the eastern Chukchi Sea produce underwater sound pulses called knocks. Chukchi Sea is a flat shallow environment that favors reflections of the sound on the surface and bottom interfaces. In acoustic data collected in the Chukchi Sea in 2007, the knocks emitted by walruses were recorded with up to seven bottom/surface reflections. Relative multipath arrival times (RMATs) provide very valuable information that can be used to define range and depth of the vocalizing animal. This paper demonstrates a method for localizing walruses based on a ray-tracing model. BELLHOP was used to simulate the RMATs received by a hydrophone for hypothetic acoustic sources located at different range and depth positions. The model assumed flat bathymetry, a source emitting at 1 kHz and a single range-independent sound speed profile per monitoring station. An index representing the match between the measured echoes and the model was calculated at each point of the model grid. The highest matching index indicated the depth and range of the walrus. Several walrus tracks were extracted from the data. Localization results allowed defining diving patterns, depths of bell-like calls, source levels estimates, knock production rate, and swimming speed of monitored walruses.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3588495
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2011
    detail.hit.zdb_id: 1461063-2
    detail.hit.zdb_id: 219231-7
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