DeAngelis Annamaria Izzi, Valtierra Robert, Van Parijs Sofie M, Cholewiak Danielle
Integrated Statistics, under contract to the Northeast Fisheries Science Center, National Marine Fisheries Service, NOAA, 166 Water Street, Woods Hole, Massachusetts 02543, USA.
Division Newport, Naval Undersea Warfare Center, 1176 Howell Street, Newport, Rhode Island 02841, USA.
J Acoust Soc Am. 2017 Aug;142(2):1078. doi: 10.1121/1.4998709.
Beaked whales are deep divers, emitting echolocation clicks while at depth. Little is known about the dive behavior of most species; however, passive acoustic data collected with towed hydrophone arrays can provide depth information using multipath reflections of clicks coupled with a two-dimensional localization of the individual. Data were collected during a shipboard survey in the western North Atlantic Ocean using a towed linear hydrophone array. Beaked whale tracks were classified as either Cuvier's (Ziphius cavirostris) or Gervais'/True's (Mesoplodon europaeus/Mesoplodon mirus). Weighted species average depths and weighted species standard deviations were 1158 m ± 287 m for Cuvier's (n = 24), and 870 m ± 151 m for Gervais'/True's (n = 15). Depth uncertainties ranged from 3% to 142% of the average depth. Slant ranges were corrected for depth to provide average horizontal perpendicular distance estimates. The average horizontal perpendicular distance distribution exhibited fewer detections in the first bin than the second. This is the first report of dive depths for Gervais'/True's beaked whales and use of this method to obtain depths for beaked whales using a towed linear array.
突吻鲸是深潜动物，在深处时会发出回声定位咔哒声。对于大多数物种的潜水行为知之甚少；然而，通过拖曳式水听器阵列收集的被动声学数据可以利用咔哒声的多径反射以及个体的二维定位来提供深度信息。数据是在北大西洋西部的一次船上调查期间，使用拖曳式线性水听器阵列收集的。突吻鲸的踪迹被分类为柯氏突吻鲸（Ziphius cavirostris）或热尔韦氏/真突吻鲸（Mesoplodon europaeus/Mesoplodon mirus）。柯氏突吻鲸（n = 24）的加权物种平均深度和加权物种标准差为1158米±287米，热尔韦氏/真突吻鲸（n = 15）为870米±151米。深度不确定性范围为平均深度的3%至142%。对倾斜距离进行深度校正以提供平均水平垂直距离估计。平均水平垂直距离分布在第一个区间的检测次数比第二个区间少。这是关于热尔韦氏/真突吻鲸潜水深度的首次报告，也是使用这种方法通过拖曳式线性阵列获取突吻鲸深度的首次报告。
