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Comparison of High-frequency Echolocation Clicks (likely Kogia) in Two Simultaneously Collected Passive Acoustic Data Sets Sampled at 200 kHz and 320 kHz
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    The Pacific Islands Fisheries Science Center has been conducting long-term passive acoustic monitoring of cetaceans at 13 sites around the central and western North Pacific Ocean since 2005 as part of the Pacific Islands Passive Acoustic Network (PIPAN). Calibrated Highfrequency Acoustic Recording Packages (HARPs; Wiggins & Hildebrand 2007) have been used at all PIPAN sites since the Network’s inception allowing for direct comparison of data sets within and across the Network. PIPAN includes a location off the Kona coast of Hawai’i Island since 2007. This region has been identified as a Biologically Important Area for several species, including an island-associated population of dwarf sperm whales (Kogia sima; Baird et al. 2013; Baird et al. 2015). The majority of recordings within PIPAN have been collected at a 200 kHz acoustic sampling rate. Although recording at a 200 kHz sampling rate captures the signals of most cetacean species, this bandwidth is insufficient to describe the full extent of all sounds produced by all species, and is not expected to effectively record the sounds of the highest frequency sound producers, such as those of the genus Kogia (Madsen et al. 2005; Merkens et al. 2018).

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