01551nas a2200169   4500008004100000022001400041245007500055210006900130260001600199300001600215490000800231520103500239100002201274700001601296700001801312856005101330       2018                        eng d  a0001-496600aSperm whale inter-pulse intervals and size: The anomaly called Yukusam0 aSperm whale interpulse intervals and size The anomaly called Yuk  cJan-09-2018  a1979 - 19790 v1443 a<p>Yukusam is the name given to a male sperm whale who was first documented off northeastern Vancouver Island in February 2018. He spent several weeks in this area before traveling south to the inland waters of the Salish Sea in late March 2018. Sperm whale clicks have been used as a proxy to determine overall size by using the time difference of arrival between the initial noise pulse and its reflections within the spermaceti organ. Different equations have been derived in order to use this Inter-Pulse Interval (IPI) to estimate overall length. Here we use Yukusam&rsquo;s usual clicks recorded from the Lime Kiln hydrophone on the west side of San Juan Island (WA State, USA) to compare IPI-based length estimates with visual observations. Photo and video documentation indicate that this whale is ~15 m in length. Our initial acoustic results indicate that equations in the literature underestimate his length by at least a few meters. The potential reasons behind these anomalies are explored in this presentation.</p>
1 aTurner, Jesse, C.1 aWood, Jason1 aTowers, Jared  uhttp://asa.scitation.org/doi/10.1121/1.5068640