Funding for this research was provided by:
EU LIFE+ Funding Programme (LIFE12 NAT/MT/000845)
Received: 22 April 2020
Revised: 8 July 2020
Accepted: 9 July 2020
First Online: 15 August 2020
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors.
: All necessary permits for sampling and observational field studies have been obtained by the authors from the competent authorities and are mentioned in the acknowledgements, if applicable.
: All data generated or analysed during this study are included in this published article (and its supplementary information files). The conclusions of this paper do not rely on any publicly available data.
: PJS, JAB, and RA conceived and designed the research. RA led the offshore research cruises supported by SG and HA; JE and LK also contributed to the field sampling. CL extracted and analysed the data and wrote the manuscript together with JE. All authors reviewed and approved the manuscript.