This study was supported by the project “Evolutive and phylogeographic history of Antarctic organisms and responses by ecosystems to climatic and environmental changings”, (PEA 2013) supported by Programma Nazionale Ricerche in Antartide (PNRA) – Ministero dell’Istruzione dell’Università e della Ricerca (MIUR). We thank two anonymous reviewers.
Received: 21 June 2016
Revised and accepted: 2 March 2017
Published online: 31 May 2017
Editor: Alessandro Minelli