Dear MARMAM, My co-authors and I are pleased to announce the publication of our article in the Journal of the Acoustical Society of America: Madrigal, B.C., Crance, J.L., Berchok, C.L., and Stimpert, A.K. (2021). Call repertoire and inferred ecotype presence of killer whales (Orcinus orca) recorded in the southeastern Chukchi Sea. The Journal of the Acoustical Society of America, 150(1), 145-158 https://doi.org/10.1121/10.0005405 Abstract: Killer whales occur in the Arctic, but few data exist regarding the ecotypes present. Calling behavior differs among ecotypes, which can be distinguished based on pulsed call type, call rate, and bandwidth. In this study, a passive acoustic recorder was deployed 75 km off Point Hope, Alaska, in the southeastern Chukchi Sea to identify which ecotypes were present. A total of 1323 killer whale pulsed calls were detected on 38 of 276 days during the summers (June-August) of 2013 to 2015. The majority of calls (n = 804, 61%) were recorded in 2013 with the most calls recorded in July (76% of total calls). Calls were manually grouped into six categories: multi-part, downsweep, upsweep, modulated, single modulation, and flat. Most detections were flat (n = 485, 37%) or multi-part calls (n = 479, 36%), which contained both high- and low-frequency components. Call comparisons with those reported in the published literature showed similarities with other transient populations in fundamental frequency contour point distribution and median frequency. This study provides the first comprehensive catalogue of transient killer whale calls in this region, as well as reports on previously undescribed calls. This publication is available online at: https://doi.org/10.1121/10.0005405 Please contact me directly if you would like a PDF copy: brijonnay.madrigal@gmail.com Best regards, Brijonnay Madrigal -- *Brijonnay Madrigal, *M.Sc. Dr. Nancy Foster Scholar Ph.D. Student, Marine Biology Graduate Program Marine Mammal Research Program University of Hawai‘i Mānoa bcm2@hawaii.edu