Killer whales occur in the Arctic but few data exist regarding the ecotypes present. The 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 2013–2015. The majority of calls (n = 804, 61%) were recorded in 2013 with the most calls recorded in July (76% of total calls). The calls were manually grouped into six categories: multipart, downsweep, upsweep, modulated, single modulation, and flat. Most detections were flat (n = 485, 37%) or multipart 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 catalog of transient killer whale calls in this region as well as reports on previously undescribed calls.

中文翻译：

---

在楚科奇海东南部记录的虎鲸 (Orcinus orca) 的呼叫曲目和推断的生态型存在

虎鲸出现在北极，但关于现有生态型的数据很少。不同生态类型的呼叫行为不同，可以根据脉冲呼叫类型、呼叫速率和带宽进行区分。在这项研究中，在楚科奇海东南部阿拉斯加希望角附近 75 公里处部署了无源声学记录器，以确定存在哪些生态型。在 2013 年至 2015 年夏季（6 月至 8 月）的 276 天中，有 38 天共检测到 1323 次虎鲸脉冲呼叫。大多数电话（n = 804, 61%）是在 2013 年记录的，7 月份记录的电话最多（占总电话的 76%）。呼叫被手动分为六类：多部分、向下扫描、向上扫描、调制、单调制和平坦。大多数检测是平坦的（n = 485, 37%）或多部分调用（n = 479, 36%)，其中包含高频和低频分量。与已发表文献中报告的呼叫比较显示与其他瞬态群体在基频轮廓点分布和中值频率方面的相似性。这项研究提供了该地区短暂虎鲸叫声的第一个综合目录，以及有关以前未描述过的叫声的报告。