DECAF - PMFR Minke Whales - Multiple Sensor - Automated Boing Detections

The recordings used for the main case study came from 12 separate days in 2006, each with ~14 hours of recordings for a total of ~ 167 hours of data. The days were: Feb 5, 21 and 25; Mar 5, 9, 13, 17, 25, and 29; and April 2, 6 and 18. An automatic detector (see Mellinger ref) was run on the whole dataset, across all hydrophones. The DECAF minke study ended up utilizing 14 of the northern hydrophones from the instrumented range at the Pacific Missile Range Facility located off the North West part of Kauai, Hawaii.

The DECAF minke study initially utilized the 16 northern hydrophones of the BSURE range at PMRF. The sixteen hydrophones are designated 44-51 and 53-60. The two southernmost hydrophones were not utilized in the full data set analysis due to issues with the number of detections relative to the other hydrophones. It is unclear if the lower detection rate is due to lower density of animals closer to shore in shallower water, or due to other effects such as higher noise levels from Humpback whale song, or the sloped bathymetry at the southern phones. These hydrophones provide suitable bandwidth for detection of the minke boing vocalization with primary energy around 1,400 Hz.

Times are in GMT.
Hydrophone locations are only approximate.
This data represents call detections - individual animals may make multiple calls.
conducted by James Yosco (Science Applications International Corporation)

本核心案例研究所用的录音数据采集自2006年的12个独立单日，单日录音时长约14小时，总数据时长约167小时。涉及的日期分别为：2月5日、21日、25日；3月5日、9日、13日、17日、25日、29日；以及4月2日、6日和18日。

研究人员针对全数据集的所有水听器（hydrophone）运行了自动检测器（详见Mellinger参考文献）。DECAF小须鲸研究最终使用了位于夏威夷考艾岛西北部外海的太平洋导弹靶场设施（Pacific Missile Range Facility, PMRF）仪器化试验场的14台北部水听器。

DECAF小须鲸研究最初采用了PMRF的BSURE阵列的16台北部水听器，这16台水听器编号为44-51与53-60。由于与其余水听器相比检测事件数量存在显著差异，最南端的2台水听器未被纳入完整数据集的分析。目前尚不明确较低的检测率是源于近岸浅水区的动物密度更低，还是受座头鲸歌声噪声水平更高、南部水听器区域海底地形坡度较大等其他因素影响。这些水听器具备适配小须鲸“boing”鸣声检测的合适带宽，其主要能量集中于1400Hz附近。

所有时间均采用格林尼治标准时间（GMT）。水听器位置仅为近似值。本数据仅代表鸣叫声检测结果——单头动物可能发出多次鸣叫声。

本研究由James Yosco（科学应用国际公司，Science Applications International Corporation）主持开展。