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  • Comparative Studies. Non-European Languages/Literatures  (15)
  • 1
    Online Resource
    Online Resource
    Measurements of ship noise and calling behavior on bioacoustic probes during opportunistic exposure of blue whales to commercial ship noise.
    Acoustical Society of America (ASA) ; 2011
    In:  The Journal of the Acoustical Society of America Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2397-2397
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2397-2397
    Abstract: Bioacoustic probes were deployed on blue whales in and around commercial shipping lanes in Southern California. The proximity of shipping routes to predictable blue whale feeding grounds makes this an ideal location to study the impact of intense low-frequency noise on whale behavior. The bioacoustic probe is outfitted with a calibrated hydrophone, and records temperature, pressure, and two-axis acceleration, allowing us to evaluate sound exposure levels in relation to swimming and calling behaviors. During eight tag deployments, large commercial ships came within 1000 m or less of the tagged whale. Received levels of ship noise were measured from the tag to estimate the sound exposure levels. Because of the high level of flow noise recorded on the tag, measurements of ship noise were only possible at minimum velocity and speed. Dive and surface behaviors were evaluated related to the passage of the ship and elevated noise levels. One calling whale was tagged and exposed to ship noise at a close approach; no major change in calling behavior was observed. The results of this research provide insight on blue whale response to ships and highlight some of the challenges when measuring low frequency noise from an attached tag. [This work was supported by the ONR.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3587797
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2011
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  • 2
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    Forecasting increases in recreational value that would result from restoration of natural soundscapes in National Parks
    Acoustical Society of America (ASA) ; 2018
    In:  The Journal of the Acoustical Society of America Vol. 143, No. 3_Supplement ( 2018-03-01), p. 1806-1806
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 143, No. 3_Supplement ( 2018-03-01), p. 1806-1806
    Abstract: U. S. National Parks are justly celebrated for the superlative quality of their scenic and cultural resources. The Grand Canyon Enlargement Act of 1975 identified natural quiet as an important resource and value. These considerations are two motivations for extensive monitoring of acoustic environments in national park units, and development of models that predict sound levels throughout the system. These models also estimate the spatial distribution of noise of noise exposure. Related social science research has documented the effects of noise on the quality of visitor experience in parks, including the accessibility of wildlife for public viewing. Surveys of park visitors and the American public also document broad support of park efforts to reduce noise. Collectively, this research provides a quantitative framework for estimating the increases in the quality of visitor experience that could be realized through reductions in noise.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5035912
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2018
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  • 3
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    An integrated underwater soundscape analysis in the Bering Strait region
    Acoustical Society of America (ASA) ; 2021
    In:  The Journal of the Acoustical Society of America Vol. 150, No. 3 ( 2021-09-01), p. 1883-1896
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 150, No. 3 ( 2021-09-01), p. 1883-1896
    Abstract: Rapid changes in the Arctic from shifting climate and human use patterns are affecting previously reported distributions and movements of marine mammals. The underwater soundscape, a key component of marine mammal habitats, is also changing. This study integrates acoustic data, collected at a site in the northern Bering Sea, with information on sound sources to quantify their occurrence throughout the year and identify deviations in conditions and dominant soundscape components. Predictive models are applied to explain variation in sound levels and to compare the relative contributions of various soundscape components. Levels across all octave bands were influenced most strongly by the variation in abiotic environment across seasons. The presence of commercial ships did not have a discernible effect on sound levels at this location and period of time. The occurrence of sources was compared to a second site, where we documented how higher levels of shipping changed that soundscape. This study demonstrated the value of acoustic monitoring to characterize the dominant acoustic features in a soundscape and the importance of preserving soundscapes based on dominant features rather than level of sound. Using a soundscape approach has relevance for protecting marine mammals and for the food security of Alaska Native communities that depend upon them.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0006099
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2021
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  • 4
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    Patterns in bioacoustic activity observed in U. S. National Parks
    Acoustical Society of America (ASA) ; 2013
    In:  The Journal of the Acoustical Society of America Vol. 134, No. 5_Supplement ( 2013-11-01), p. 4175-4175
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 134, No. 5_Supplement ( 2013-11-01), p. 4175-4175
    Abstract: The Natural Sounds and Night Skies Division of the U.S. National Park Service has collected month-long acoustic recordings at more than 300 sites in 73 park units located throughout the United States, dating back to 2000. Each monitoring session lasted 25 days or more; some sites were monitored more than once. At all sites a calibrated Sound Level Meter recorded acoustic data in one-second, one-third octave band resolution; at many sites, simultaneous continuous acoustic recordings were collected using a digital audio recorder. These data were analyzed to identify broad patterns in bioacoustic activity within one-third octave bands. These bioacoustical patterns were analyzed in relation to site characteristics, seasons, and anthropogenic noise levels to identify significant associations. The resultant model could be used to produce a map predicting bioacoustical activity throughout the coterminous United States.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4831305
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2013
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  • 5
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    Noise, national parks, and the wildlife therein
    Acoustical Society of America (ASA) ; 2016
    In:  Journal of the Acoustical Society of America Vol. 139, No. 4_Supplement ( 2016-04-01), p. 2089-2089
    Details
    In: Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 139, No. 4_Supplement ( 2016-04-01), p. 2089-2089
    Abstract: Monitoring at more than 600 sites in National Park Service (NPS) units has shown that noise poses widespread concerns: a contaminant to the physical environment, an infringement on superlative visitor experience, and a sensory burden for wildlife. NPS acoustical data were generalized into maps predicting sound levels for the coterminous U.S. These maps document the spatial scope and intensity of noise burdens on wildlife for park and other protected areas in the U.S. Although NPS units and other protected areas generally have sound levels a few decibels lower than adjacent unprotected land, 15% of all protected areas have sound levels 10 dB higher than predicted natural levels (median A-weighted levels). Designated critical habitat for 20 threatened animal species (US Fish and Wildlife Service) also exceed this 10 dB noise exposure criterion. Wildlife responses to noise have been documented in a wide range of taxa and habitats, with the past six years witnessing rapid growth in this research. Notably, controlled playback studies have been performed in otherwise pristine habitats to demonstrate that noise alone affects habitat utilization, foraging effectiveness, and breeding success. Noise may still present underestimated threats to wildlife; it certainly presents underutilized opportunities for habitat restoration.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4950199
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2016
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  • 6
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    Rapid extraction of ecologically meaningful information from large-scale acoustic recordings
    Acoustical Society of America (ASA) ; 2017
    In:  The Journal of the Acoustical Society of America Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3940-3940
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 141, No. 5_Supplement ( 2017-05-01), p. 3940-3940
    Abstract: Acoustic recordings have the potential to address a suite of important conservation questions, from assessing phenology shifts due to climate change, to examining the impact of anthropogenic noise on wildlife, to monitoring biodiversity at enormous spatio-temporal scales. However, consistent methods are required to extract meaningful information from these large datasets. Here we apply a method of calibrating recordings to standardize acoustic data collected at over 50 unique sites in a diversity of habitats across the continental U.S. using a variety of recording units and parameters. The calibration method results in a coarser data resolution, decreasing storage space and computation time of further analysis. We then apply recently developed acoustic indices to evaluate biodiversity in our recordings. A review of existing acoustic indices and degree of correlation with bioacoustic activity, species richness, functional diversity, landscape attributes, and anthropogenic influence guided our decisions about what indices to implement. Resulting indices were compared with the diversity of birds from observer point counts and from animal vocalizations observed in the recording spectrograms and to anthropogenic sounds observed in the recordings. The results provide important insight on the utility of each index, or group of indices, to investigate dynamics of ecological communities across large scales.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4988921
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2017
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  • 7
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    Seasonal trends and primary contributors to the low-frequency soundscape of the Cordell Bank National Marine Sanctuary
    Acoustical Society of America (ASA) ; 2020
    In:  The Journal of the Acoustical Society of America Vol. 148, No. 2 ( 2020-08-01), p. 845-858
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 148, No. 2 ( 2020-08-01), p. 845-858
    Abstract: Passive acoustic monitoring of ocean soundscapes can provide information on ecosystem status for those tasked with protecting marine resources. In 2015, the National Oceanic and Atmospheric Administration (NOAA) established a long-term, continuous, low-frequency (10 Hz–2 kHz) passive acoustic monitoring site in the Cordell Bank National Marine Sanctuary (CBNMS), located offshore of the central United States of America (U.S.) west coast, near San Francisco, CA. The California Current flows southward along the coast in this area, supporting a diverse community of marine animals, including several baleen whale species. Acoustic data analysis revealed that both large vessels and vocalizing baleen whales contribute to the ambient soundscape of the CBNMS. Sound levels fluctuated by month with the highest levels in the fall and lowest levels in the summer. Throughout the year, very low-frequency (10–100 Hz) sound levels were most variable. Vessels and whales overlap in their contributions to ambient sound levels within this range, although vessel contributions were more omnipresent, while seasonal peaks were associated with vocalizing whales. This characterization of low-frequency ambient sound levels in the CBNMS establishes initial baselines for an important component of this site's underwater soundscape. Standardized monitoring of soundscapes directly supports NOAA's ability to evaluate and report on conditions within national marine sanctuaries.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/10.0001726
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2020
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  • 8
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    Changes in ambient sound levels observed in relation to the operational status of the Mesa Wind Project Site
    Acoustical Society of America (ASA) ; 2015
    In:  Journal of the Acoustical Society of America Vol. 137, No. 4_Supplement ( 2015-04-01), p. 2369-2369
    Details
    In: Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 137, No. 4_Supplement ( 2015-04-01), p. 2369-2369
    Abstract: Type 1 sound level measurements and continuous audio recordings were obtained from two sites near the Mesa Wind Project Site (MWPS), 100 m and 1500 m from the nearest turbine. The sites were upwind of the turbines. Unexpectedly, MWPS ceased operating 29 days after this project began; data were collected for an additional 127 days. Contrasts in hourly summaries of 1 second 1/3rd octave sound level measurements, controlled for hourly mean wind speed, revealed the contributions of rotating blades. For the near site, at wind speeds below 5 m/s, 1/3rd octave band levels increased starting at about 100 Hz, with distinct spectral peaks appearing between 400 Hz and 2000 Hz. These spectral peaks were less prominent when hourly mean wind speed was 5 m/s or greater. At the far site, small increases in sound level were observed for 1/3rd octave bands at 1 kHz and below when the blades were turning. The levels measured in this study will be compared with levels measured at NPS sites, to evaluate distances at which operational wind farms might affect park acoustical environments.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.4920606
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2015
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  • 9
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    Measurements of radiated underwater noise from modern merchant ships relevant to noise impacts on marine mammals.
    Acoustical Society of America (ASA) ; 2011
    In:  The Journal of the Acoustical Society of America Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2368-2368
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 129, No. 4_Supplement ( 2011-04-01), p. 2368-2368
    Abstract: There is mounting concern over the effect of ship noise on marine mammals; however, limited empirical data quantifying this noise impede our ability to evaluate impacts. An opportunistic approach for measuring radiated ship noise (20–1000 Hz) was used in this study. Calibrated acoustic data were combined with archived information on seven types of modern merchant ships transiting the coast of southern California. Three metrics for describing ship noise were applied: received sound levels (RLs) during 1 h passages, estimated source levels (SLs), and sound exposure levels (SELs). 1 h passages provided an estimate of the spatial extent of ship noise. At 40 Hz, container ships elevated noise above background up to 7 km forward of the ship and 19 km aft; bulk carriers elevated noise above background up to 5 km at bow and stern aspects. These ship-types had similar broad band estimated SL, 186 dB re 1 μPa at 1 m. The cumulative exposure to ship noise varied by ship type; we presented equations for estimating SELs for specific ship types. In concert, these metrics create a tool for quantifying ship noise within coastal marine environments, and can be used to assess the impact of ship noise on marine mammals. [This work was supported by the U.S. Navy CNO N45 and additional funds from the ONR, the NOAA, and the NSF.]
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.3587665
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2011
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  • 10
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    Working towards a standardized approach to reporting of sound measurements in wildlife studies
    Acoustical Society of America (ASA) ; 2019
    In:  The Journal of the Acoustical Society of America Vol. 146, No. 4_Supplement ( 2019-10-01), p. 2934-2934
    Details
    In: The Journal of the Acoustical Society of America, Acoustical Society of America (ASA), Vol. 146, No. 4_Supplement ( 2019-10-01), p. 2934-2934
    Abstract: We present guidance we have developed and adapted through attempts to synthesize and distill the diverse literature documenting wildlife responses to noise into concise support for conservation planning. Our systematic review revealed significant inconsistencies in the use of—and specifications for—acoustic metrics. Studies typically report noise levels in decibels (dB), yet these values can arise from a diverse array of methods and processing procedures. Though some of this diversity reflects varied objectives and acoustical contexts, we believe that normative guidance and better awareness of standards would enhance the interpretation, repeatability of published studies, and incorporation of results into conservation planning. Nested within this larger issue is the vexing problem of calibration, especially in relation to consumer audio recorders or emerging products for bioacoustical monitoring. While it is possible to extract useful information about acoustic phenology or species presence from uncalibrated audio recordings, calibration can deliver a much broader range of information. We review the suite of calibration options presently available, and our experience with implementing and sharing solutions.
    Type of Medium: Online Resource
    ISSN: 0001-4966 , 1520-8524
    URL: Article
    DOI: 10.1121/1.5137190
    RVK:
    EQ 1000
    Language: English
    Publisher: Acoustical Society of America (ASA)
    Publication Date: 2019
    detail.hit.zdb_id: 1461063-2
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