The mainland New Zealand islands showing major locations referenced in the text. The dotted line in eastern NI approximates the major SW-NE mountain axis (which lies on the Alpine Fault together with the Southern Alps in SI). The latitudinal reach of the mainland islands extends from approximately 34° S to 47° S.
Marshall et al. BMC Evolutionary Biology 2012 12:177 doi:10.1186/1471-2148-12-177