Figure 1.

Steamer duck distribution. The geographical range of each species of Tachyeres, coded by colour, is based on that described by Livezey & Humphrey [4] and the International Union for Conservation of Nature (IUCN) species description. The inset provides an expanded view of the sampling locations in the Falkland Islands. The estimated maximum limit of glaciation during the great Patagonian glaciation (dashed line) follows that described by Rabassa & Coronato [5]. The expanded coastal limit (solid line) reflects sea levels 140–200 m below present.