Origin and Abundance of Steller Sea Lions (Eumetopias jubatus) in Winter Haulout at Benten-Jima Rock Off Cape Soya, Hokkaido, Japan between 2012–2017

IF 0.8 4区生物学 Q3 ZOOLOGY

Mammal Study Pub Date : 2022-02-02 DOI:10.3106/ms2020-0029

Y. Goto, Takeomi Isono, Shun Ikuta, V. Burkanov

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引用次数: 1

Abstract

Abstract. Benten-Jima Rock, located off Cape Soya, Hokkaido, has been a Steller sea lion (SSL; Eumetopias jubatus) winter haulout for decades. The animals usually occupy the site from October to May. Observations have been sporadic, although the population count started to increase in 2005. We have monitored SSL numbers since 2012 using several survey methods, such as observation by direct counting and remote archival cameras. Since these data were not sufficient, owing to blind spots, we started using unmanned aerial vehicle (UAV) surveys in 2016 and corrected the previously collected data. Using these methods, a considerable number of SSLs were observed at Benten-Jima Rock during 2016–2017. The maximum number of SSLs was 3158 on land and 3056 in the water near the site, as counted from UAV images on May 2, 2017. Based on hot brand marks, we found that Benten-Jima Rock hosted SSLs from all ten main rookeries along the Asian coast. The majority (∼60%) were from Tuleny Island near the east coast of Sakhalin. The cause of this extraordinary increase in SSL numbers at Benten-Jima Rock remains unclear and requires further monitoring and research.

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2012-2017年，日本北海道大豆角本腾岛岩石冬季运输中虎头海狮(Eumetopias jubatus)的起源和数量

摘要位于北海道黄豆角附近的本藤岛岩(Benten-Jima Rock)曾是一只虎头海狮(Steller sea lion;Eumetopias jubatus)冬季运输数十年。这些动物通常从10月到5月占据这个地方。虽然种群数量在2005年开始增加，但观测结果是零星的。自2012年以来，我们一直在使用几种调查方法监测SSL数量，例如通过直接计数和远程存档摄像机进行观察。由于这些数据不充分，存在盲点，我们在2016年开始使用无人机(UAV)调查，并对之前收集的数据进行了校正。使用这些方法，2016-2017年期间在Benten-Jima岩石观察到相当数量的ssl。根据2017年5月2日的无人机图像，陆地上的最大数量为3158个，附近水域的最大数量为3056个。根据热门品牌标记，我们发现本藤岛岩拥有来自亚洲沿海所有十个主要栖息地的ssl。大多数(约60%)来自库页岛东海岸附近的Tuleny岛。本顿岛岩石SSL数量异常增加的原因尚不清楚，需要进一步监测和研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Mammal Study ZOOLOGY-

CiteScore

1.70

自引率

20.00%

发文量

审稿时长

>12 weeks

期刊介绍： Mammal Study is the official journal of the Mammal Society of Japan. It publishes original articles, short communications, and reviews on all aspects of mammalogy quarterly, written in English.