The current known distribution of Omura’s whale includes the tropical and warm temperate waters of the western Pacific, Indian, and Atlantic Oceans. Evidence of their presence in the Atlantic Ocean is based on beach cast specimens found on the coasts of Mauritania (North Atlantic) and Northeastern Brazil (South Atlantic). The present study characterizes the occurrence of this species in the São Pedro and São Paulo Archipelago (SPSPA), on the mid-Atlantic ridge between South America and Africa, based on autonomous recording systems. Acoustic signals were similar, but not identical, to B. omurai vocalizations recorded off the coast of Madagascar. Although these signals were recorded for only 11 months, there are peaks in vocal activity between May and June in the vicinities of SPSPA, suggesting either a shift in distribution within the Atlantic equatorial waters or seasonality in the species’ vocal behavior in this region. The first acoustic records of Omura’s whales in the Equatorial Atlantic suggest that these animals may also use deep-water habitats, in addition to the shallow-water habitat use observed in other regions.

中文翻译：

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基于被动声监测，大赤鲸在赤道大西洋中发生大头鲸Balaenoptera omurai（Cetacea：Balaenopteridae）。

大村鲸的当前已知分布包括西太平洋，印度洋和大西洋的热带和温暖的温带水域。它们在大西洋中存在的证据是基于在毛里塔尼亚（北大西洋）和巴西东北部（南大西洋）沿海发现的海滩铸造标本。根据自主记录系统，本研究描述了该物种在南美和非洲之间的大西洋中脊圣佩德罗和圣保罗群岛（SPSPA）的发生。声音信号与大武杆菌相似但不完全相同马达加斯加沿海地区的发声记录。尽管这些信号仅记录了11个月，但SPSPA周边地区5月至6月之间的声音活动达到峰值，这表明该地区大西洋赤道水域的声音分布发生了变化，或者该物种的声音行为出现了季节性。在赤道大西洋的大村鲸的第一个声学记录表明，除了在其他地区观察到的浅水生境用途外，这些动物还可能使用深水生境。