The population density of Cuvier's beaked whales is estimated acoustically with drifting near-surface hydrophone recorders in the Catalina Basin. Three empirical approaches (trial-based, distance-sampling, and spatially explicit capture-recapture) are used to estimate the probability of detecting the echolocation pulses as a function of range. These detection functions are used with two point-transect methods (snapshot and dive-cue) to estimate density. Measurement errors result in a small range of density estimates (3.9–5.4 whales per 1000 km²). Use of multiple approaches and methods allows comparison of the required information and assumptions of each. The distance-sampling approach with snapshot-based density estimates has the most stringent assumptions but would be the easiest to implement for large scale surveys of beaked whale density. Alternative approaches to estimating detection functions help validate this approach. The dive cue method of density estimation has promise, but additional work is needed to understand the potential bias caused by animal movement during a dive. Empirical methods are a viable alternative to the theoretical acoustic modeling approaches that have been used previously to estimate beaked whale density.

中文翻译：

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根据近地水听器估算居维叶喙鲸的声探测范围和种群密度

用卡塔利娜盆地的近地水听器记录器，以声学方法估算居维叶喙鲸的种群密度。三种经验方法（基于试验的，距离采样的和空间显式的捕获-捕获）用于估计检测回波定位脉冲随距离变化的概率。这些检测功能与两种点断点方法（快照和俯冲提示）一起使用以估计密度。测量误差导致密度估计值的范围很小（每1000 km ² 3.9–5.4头鲸））。使用多种方法和方法可以比较所需的信息和每种方法的假设。具有基于快照的密度估计的距离采样方法具有最严格的假设，但对于喙鲸密度的大规模调查而言，将最容易实施。估计检测功能的替代方法有助于验证此方法。密度估计的潜水提示方法很有希望，但是需要更多的工作来了解潜水过程中动物运动引起的潜在偏差。经验方法可以替代先前用于估计喙鲸密度的理论声学建模方法。