About the Authors

Nicholas D. Higgs

nicholas.higgs@plymouth.ac.uk

Affiliation Marine Institute, Plymouth University, Drake Circus, Plymouth, United Kingdom

Andrew R. Gates

Affiliation SERPENT Project, National Oceanography Centre, Southampton, United Kingdom

Daniel O. B. Jones

Affiliation SERPENT Project, National Oceanography Centre, Southampton, United Kingdom

Competing Interests

The authors have declared that no competing interests exist.

Author Contributions

Analyzed the data: NDH ARG DOBJ. Wrote the paper: NDH ARG DOBJ. Prepared Supporting Information: NDH.