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  1. Article ; Online: Classification of Florida manatee (Trichechus manatus latirostris) vocalizations.

    Brady, Beth / Hedwig, Daniela / Trygonis, Vasilis / Gerstein, Edmund

    The Journal of the Acoustical Society of America

    2020  Volume 147, Issue 3, Page(s) 1597

    Abstract: The vocal repertoire for the Florida manatee is quantitatively categorized from a sample of 1114 calls recorded from 3 different manatee habitats in Florida. First, manatee vocalizations were categorized into five call categories based on visual ... ...

    Abstract The vocal repertoire for the Florida manatee is quantitatively categorized from a sample of 1114 calls recorded from 3 different manatee habitats in Florida. First, manatee vocalizations were categorized into five call categories based on visual inspection of spectrograms and following descriptions provided in previous studies. Second, based on measurements of 17 acoustic parameters, the subjective classification scheme was validated using classification and regression trees (CARTs) and model-based cluster analysis paired with silhouette coefficients. CART analysis revealed that these five broad call categories can be successfully distinguished based on correct classification scores of 41.6%-62.5%. Silhouette coefficients determined that the manatee vocal repertoire is highly intergraded. This study supports and expands upon existing subjective categorization schemes by providing a quantifiable methodology for describing the Florida manatees' vocal repertoire. These findings contribute to the increasing number of studies suggesting many animal species vocal repertoires contain graded call types.
    Language English
    Publishing date 2020-04-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 219231-7
    ISSN 1520-8524 ; 0001-4966
    ISSN (online) 1520-8524
    ISSN 0001-4966
    DOI 10.1121/10.0000849
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 591: Show issues Location:
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  2. Article: Spatiotemporal distribution of fish schools around drifting fish aggregating devices

    Trygonis, Vasilis / Laurent Dagorn / Patrice Brehmer / Stratis Georgakarakos

    Fisheries research. 2016 May, v. 177

    2016  

    Abstract: Omnidirectional sonar surveys were conducted in close proximity to drifting fish aggregating devices (FADs) offshore Seychelles, western Indian Ocean, to investigate the number, size, and distribution of FAD-associated fish schools. Echotrace detection ... ...

    Abstract Omnidirectional sonar surveys were conducted in close proximity to drifting fish aggregating devices (FADs) offshore Seychelles, western Indian Ocean, to investigate the number, size, and distribution of FAD-associated fish schools. Echotrace detection techniques applied on the raw multibeam data enabled the extraction of empirical statistics regarding inter-school distances, and allowed the visualization of the temporal evolution of the pelagic aggregation on a FAD-centered coordinate system. The sonar recordings revealed the concurrent existence of multiple fish schools that were spatially clustered and exhibited low permanence in size and structure. Schools were predominantly detected within a radius of 500m from the FADs, although 15% of detections occurred between 500 to 1500m from the floating devices. Fish school biomass detected with the sonar was aggregated into a few, large schools during daytime, and dispersed into a larger number of small schools during nighttime. Compared to daytime observations, nighttime schools maintained smaller inter-school distances and were located closer to the drifting FADs. The study demonstrates that horizontal sonars are powerful tools for studying the spatiotemproral distribution of large pelagic schools in the vicinity of drifting FADs.
    Keywords aggregation behavior ; biomass ; diurnal variation ; schools of fish ; statistics ; surveys ; Indian Ocean ; Seychelles
    Language English
    Dates of publication 2016-05
    Size p. 39-49.
    Publishing place Elsevier B.V.
    Document type Article
    ZDB-ID 406532-3
    ISSN 0165-7836
    ISSN 0165-7836
    DOI 10.1016/j.fishres.2016.01.013
    Database NAL-Catalogue (AGRICOLA)

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  3. Article ; Online: Vocalization characteristics of North Atlantic right whale surface active groups in the calving habitat, southeastern United States.

    Trygonis, Vasilis / Gerstein, Edmund / Moir, Jim / McCulloch, Stephen

    The Journal of the Acoustical Society of America

    2013  Volume 134, Issue 6, Page(s) 4518

    Abstract: Passive acoustic surveys were conducted to assess the vocal behavior of North Atlantic right whales (Eubalaena glacialis) in the designated critical calving habitat along the shallow coastal waters of southeastern United States. Underwater vocalizations ... ...

    Abstract Passive acoustic surveys were conducted to assess the vocal behavior of North Atlantic right whales (Eubalaena glacialis) in the designated critical calving habitat along the shallow coastal waters of southeastern United States. Underwater vocalizations were recorded using autonomous buoys deployed in close proximity to surface active groups (SAGs). Nine main vocalization types were identified with manual inspection of spectrograms, and standard acoustic descriptors were extracted. Classification trees were used to examine the distinguishing characteristics of calls and quantify their variability within the SAG vocal repertoire. The results show that descriptors of frequency, bandwidth, and spectral disorder are the most important parameters for partitioning the SAG repertoire, contrary to duration-related measures. The reported source levels and vocalization statistics provide sound production data vital to inform regional passive acoustic monitoring and conservation for this endangered species.
    MeSH term(s) Acoustics/instrumentation ; Animals ; Animals, Newborn ; Ecosystem ; Endangered Species ; Environmental Monitoring/instrumentation ; Environmental Monitoring/methods ; Female ; Male ; Maternal Behavior ; Oceans and Seas ; Pattern Recognition, Automated ; Reproduction ; Signal Processing, Computer-Assisted ; Social Behavior ; Sound Spectrography ; Southeastern United States ; Species Specificity ; Transducers, Pressure ; Vocalization, Animal/classification ; Whales/classification ; Whales/physiology ; Whales/psychology
    Language English
    Publishing date 2013-12
    Publishing country United States
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 219231-7
    ISSN 1520-8524 ; 0001-4966
    ISSN (online) 1520-8524
    ISSN 0001-4966
    DOI 10.1121/1.4824682
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.B 591: Show issues Location:
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