The southeast Pacific (SEP) contains the home ranges of several migratory large whale species, determined largely based on research in coastal waters. These whales’ pelagic seasonal residency is unknown. The Juan Fernández Archipelago (JFA) is an offshore island in the SEP where passive acoustic monitoring (PAM) data collection is ongoing at the HA03 hydroacoustic station (sample rate of 250 Hz) maintained by the Preparatory Comprehensive Nuclear-Test-Ban Treaty Organization. Six years (2007–2009 and 2014–2016) of PAM data from HA03 were examined for the acoustic presence of Antarctic, Chilean (southeast Pacific 1, southeast Pacific 2), and southeast Indian Ocean blue whale song types; the fin whale 20-Hz song; and minke whale vocalizations. The weekly presence or absence of these six vocalization types was annotated manually by an expert analyst and then averaged across all years. For each vocalization type, the number of weeks per month with presence was averaged over all years. Consistently, we found austral wintertime presence of Antarctic blue, fin, and minke whales; and the year-round presence of Chilean blue whales. Southeast Indian Ocean blue whales were also detected, but very rarely. We discuss the possible seasonal movements of each species or acoustic group in the offshore SEP. This is the first year-round multispecies study of baleen whale in the offshore SEP and provides valuable information for understanding the migrations of endangered baleen whales in this region, highlighting the importance of offshore areas as hotspots for baleen whale biodiversity.

中文翻译：

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智利胡安·费尔南德斯群岛对岸蓝，鳍和小须鲸的季节性声学现象（2007–2016）

东南太平洋（SEP）包含多种迁徙大鲸鱼物种的栖息地，这很大程度上是根据沿海水域的研究确定的。这些鲸鱼的远洋季节性居住地未知。胡安·费尔南德斯群岛（JFA）是SEP的一个离岛，在该地区，由准备全面核试验禁试条约组织维护的HA03水声站（采样频率为250 Hz）正在进行被动声监测（PAM）数据收集。检查了来自HA03的六年（2007–2009年和2014–2016年）的PAM数据，以了解南极，智利（东南太平洋1，东南太平洋2）和东南印度洋蓝鲸歌曲类型的声学存在；鲸鱼的20 Hz歌曲; 和小须鲸发声。专家分析员手动注释这六种发声类型的每周出现或不出现，然后在所有年份中取平均值。对于每种发声类型，在所有年份中平均每个月在场的星期数。一致地，我们发现南极冬季存在南极蓝，鳍和小须鲸。以及全年都有的智利蓝鲸。东南印度洋的蓝鲸也被发现，但很少。我们讨论了海上SEP中每个物种或声学群的可能季节性运动。这是近海SEP开展的第一批针对鲸鱼的跨物种多年度研究，它为了解该地区濒临灭绝的鲸鱼的迁移提供了宝贵的信息，强调了近海地区作为鲸鱼生物多样性热点的重要性。