About the Authors

Julia Ivanchikova

Contributed equally to this work with: Julia Ivanchikova, Nicholas Tregenza

Roles Data curation, Formal analysis, Investigation, Project administration, Validation, Writing – original draft

julia.ivanchikova@gmail.com

Affiliations Schmalhausen Institute of Zoology of National Academy of Sciences of Ukraine, Kyiv, Ukraine, Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, Scotland, United Kingdom

Nicholas Tregenza

Contributed equally to this work with: Julia Ivanchikova, Nicholas Tregenza

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

Affiliation Chelonia Limited, Mousehole, Cornwall, United Kingdom

Competing Interests

Nick Tregenza, who is the co-author of this research, is the owner of Chelonia Ltd, who provided the BlackCeTrends project with 20 F-PODs in-kind. The logistics for the BlackCeTrends project was supported by different organisations as in-kind contributions or within already existing cetacean study programs, without involving any additional funding, specific for the project. There are no patents, products in development or marketed products to declare. This does not alter our adherence to PLOS ONE policies on sharing data and materials.