Trygonis Vasilis, Gerstein Edmund, Moir Jim, McCulloch Stephen
Harbor Branch Oceanographic Institute at Florida Atlantic University, 5600 US 1 North, Florida 34946.
Charles E. Schmidt College of Science, Florida Atlantic University, 777 Glades Road, Florida 33431.
J Acoust Soc Am. 2013 Dec;134(6):4518. doi: 10.1121/1.4824682.
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.
开展了被动声学调查，以评估北大西洋露脊鲸（Eubalaena glacialis）在美国东南部沿海水域指定的关键产犊栖息地的发声行为。使用部署在靠近表面活跃群体（SAGs）的自主浮标记录水下发声。通过对声谱图进行人工检查，识别出九种主要发声类型，并提取了标准声学描述符。使用分类树来检查叫声的区别特征，并量化其在SAG发声库中的变异性。结果表明，与持续时间相关的测量不同，频率、带宽和频谱紊乱的描述符是划分SAG发声库的最重要参数。报告的声源级和发声统计数据提供了声音产生数据，对于为该濒危物种进行区域被动声学监测和保护至关重要。
