Fig. 1

Map depicting the sampling and distribution of the ‘albiceps complex’. Dark mustard color depicts breeding range and light mustard depicts wintering range of the taxon chilensis. Blue color depicts all-year distribution of sympatric taxa albiceps and pallatangae. Green depicts the all-year distribution of the taxon modesta, which is unsampled in this study. Sampling localities for each taxon are depicted using symbols: albiceps in blue squares, chilensis in mustard circles and pallatangae in pink triangles. Map adapted from Fitzpatrick et al. [79] with minor changes