Funding for this research was provided by:
National Research Foundation (93090)
Received: 14 December 2019
Accepted: 5 May 2020
First Online: 29 June 2020
Ethics approval and consent to participate
: The project has ethics clearance from the Nelson Mandela University Animal Research Ethics Committee (A14-SCI-ZOO-012) and was approved by the Prince Edward Islands Management committee and carried out under permit from the Director-General: Department of Environmental Affairs, South Africa.
: Not applicable.
: The authors have no competing interests.