About the Authors

Koki Tsujii

Roles Conceptualization, Data curation, Formal analysis, Investigation, Methodology, Resources, Software, Validation, Visualization, Writing – original draft, Writing – review & editing

tsujii@owa1989.com

Affiliations Ogasawara Whale Watching Association, Chichi-jima, Ogasawara-mura, Tokyo, Japan, Graduate School of Environmental Science, Hokkaido University, Hakodate, Hokkaido, Japan

Tomonari Akamatsu

Roles Conceptualization, Data curation, Formal analysis, Funding acquisition, Investigation, Methodology, Project administration, Resources, Software, Supervision, Validation, Visualization, Writing – original draft, Writing – review & editing

Affiliation National Research Institute of Fisheries Science, Japan Fisheries Research and Education Agency, Fukuura, Kanagawa, Japan

Ryosuke Okamoto

Roles Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Ogasawara Whale Watching Association, Chichi-jima, Ogasawara-mura, Tokyo, Japan

Kyoichi Mori

Roles Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Teikyo University of Science, Uenohara, Yamanashi, Japan

Yoko Mitani

Roles Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Field Science Center for Northern Biosphere, Hokkaido University, Hakodate, Hokkaido, Japan

Naoya Umeda

Roles Conceptualization, Data curation, Funding acquisition, Investigation, Methodology, Project administration, Resources, Supervision, Validation, Visualization, Writing – review & editing

Affiliation Osaka University, Suita, Osaka, Japan

Competing Interests

The authors have declared that no competing interests exist.