Received: 30 August 2018
Accepted: 22 August 2019
First Online: 18 September 2019
Ethics approval and consent to participate
: No ethics approvals were required for work on invertebrates. Sampling permissions were granted by the Government of South Georgia and the South Sandwich Islands (084/2011, 096/2012).
: Not applicable.
: The authors declare that they have no competing interests.