Table 1. Details of sampling locations and numbers of M. antarctica individuals collected, including 240 individuals previously sampled by Hoffman et al. [46].

Region	Site	Population	Latitude (S)	Longitude (W)	No. of samples
Ryder Bay	Anchorage Island	Rose Garden	−67.607	−68.191	48
		Anchorage North	−67.602	−68.202	44
		Trolval	−67.608	−68.218	43
	Rothera Point	East Beach	−67.572	−68.118	43
	Leonie Island	Leonie North	−67.603	−68.336	44
Galindez Island	–	–	−65.233	−64.233	48
Dobrolowski Island	–	–	−64.917	−62.607	48
Snow Island	–	–	−62.778	−61.374	48
Signy Island	–	–	−60.677	−45.607	48
Total	–	–	–	–	414

The three spatial scales investigated were as follows (i) Fine-scale (within Anchorage Island) comprising samples from Rose Garden, Anchorage North and Trolval; (ii) Medium-scale (among islands within Ryder Bay) comprising samples from Anchorage Island, Rothera Point and Leonie Island; (iii) Large scale (along the Antarctic Peninsula) comprising samples from Ryder Bay, Galindez Island, Dobrolowski Island, Snow Island and Signy Island.