51517 Document Published / External 30990 PSD- Cetacean Research Program (CRP) Publications Portfolio Project Completed 2018-09 Several species of odontocetes, including those in the genus Kogia, produce high- frequency (> 100 kHz) echolocation clicks. To compare the detection performance of High-frequency Acoustic Recording Packages (HARPs) for these signals, two instruments were deployed simultaneously on the same mooring off the Kona coast of the Island of Hawai’i. One instrument sampled at 200 kHz, while the other sampled at 320 kHz. The instrument sampling at 320 kHz recorded the full frequency content of high-frequency clicks and formed the basis for a comparison of relative click detection rates in the data sampled at 200 kHz, where clicks were aliased and truncated at the Nyquist frequency of 100 kHz. We compared a variety of detection metrics, including the number of high-frequency clicks, the number of encounters including high-frequency clicks, and the number of days with high-frequency click detections within each data set. This comparison revealed that the 200 kHz sampled data set contained 69% of the high-frequency click encounters relative to the 320 kHz sampled data set, representing 89% of days with high-frequency click detections. The vast majority of long-term passive acoustic data sets collected as part of the Pacific Islands Passive Acoustic Network are sampled at 200 kHz and this comparison suggests that measures of high-frequency click occurrence at the scale of days or longer are likely unbiased. Researchers should be cautious using 200 kHz sampled data to infer fine-scale (e.g. hourly) occurrence, as such measures are more likely to be biased by other factors that may influence high-frequency click detection on a similar scale. Merkens KP, Oleson EM. 2018. Comparison of high-frequency echolocation clicks (likely Kogia) in two simultaneously collected passive acoustic data sets sampled at 200 kHz and 320 kHz. NOAA Tech Memo. NMFS-PIFSC-74, 21 p. doi:10.25923/jjss-er34. https://doi.org/ 10.25923/jjss -er34 Theme High-frequency, narrow-band Theme Kogia Theme Passive acoustic monitoring Spatial Hawaii Pacific Islands Fisheries Science Center Honolulu HI USA Technical Memorandum (Tech Mem Acrobat Portable Document Format Published Author 2016 Person Merkens, Karlina PB karlina.merkens@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5749 email Co-Author 2018 Person Oleson, Erin M erin.oleson@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5712 9:00 a.m. - 5:00 p.m. Data Steward 2016 Person Merkens, Karlina PB karlina.merkens@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5749 email Distributor 2016 Organization Pacific Islands Fisheries Science Center PIFSC pifsc.info@noaa.gov https://ror.org/02apffz65 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5360 https://www.pifsc.noaa.gov Pacific Island Fisheries Science Center homepage Online Resource 8:00 a.m. - 4:30 p.m. Metadata Contact 2016 Person Merkens, Karlina PB karlina.merkens@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5749 email Point of Contact 2016 Person Merkens, Karlina PB karlina.merkens@noaa.gov 1845 Wasp Blvd. Honolulu HI 96818 USA (808)725-5749 email -156.5 -155.5 20 19 Range 2016-07 2016-08 Unclassified Requester will be asked to submit a request by email to Erin Oleson (erin.oleson@noaa.gov) or Karlina Merkens (karlina.merkens@noaa.gov) Requester will be asked to submit a request by email to Erin Oleson (erin.oleson@noaa.gov) or Karlina Merkens (karlina.merkens@noaa.gov) Requester will be asked to submit a request by email to Erin Oleson (erin.oleson@noaa.gov) or Karlina Merkens (karlina.merkens@noaa.gov) Requester will be asked to submit a request by email to Erin Oleson (erin.oleson@noaa.gov) or Karlina Merkens (karlina.merkens@noaa.gov) none none https://repository.library.noaa.gov/view/noaa/19448 PDF PDF - Adobe Portable Document Format https://repository.library.noaa.gov/view/noaa/19448 gov.noaa.nmfs.inport:51517 Karlina Merkens 2018-02-08T13:22:23 SysAdmin InPortAdmin 2025-12-03T01:00:28 2019-07-17 Pacific Islands Fisheries Science Center PIFSC 1845 Wasp Blvd. Honolulu HI 96818 USA 808-725-5300 https://www.pifsc.noaa.gov 8:00 a.m. - 4:30 p.m. 1001 Public No 2019-07-17 1 Year 2020-07-17