Table 2. Matrix of geographic distances among the nine M. antarctica sampling sites in kilometres.
| Rose Garden | Anchorage North | Trolval | Rothera Point | Leonie Island | Galindez Island | Dobrowolski Island | Snow Island | Signy Island | |
| Rose Garden | 0 | ||||||||
| Anchorage North | 0.66 | 0 | |||||||
| Trolval | 0.71 | 0.64 | 0 | ||||||
| Rothera Point | 2.98 | 2.50 | 3.12 | 0 | |||||
| Leonie Island | 3.62 | 3.56 | 2.99 | 5.70 | 0 | ||||
| Galindez Island | 304.18 | 303.66 | 304.22 | 301.20 | 305.88 | 0 | |||
| Dobrowolski Island | 370.17 | 369.59 | 370.09 | 367.25 | 371.28 | 88.27 | 0 | ||
| Snow Island | 635.07 | 634.53 | 635.07 | 632.10 | 636.57 | 331.84 | 270.97 | 0 | |
| Signy Island | 1342.37 | 1342.10 | 1342.74 | 1339.71 | 1345.37 | 1083.96 | 1076.25 | 866.43 | 0 |