Figure 5.

Cook Strait connections. A wide range of scenarios for South Island-North Island phylogeography are plausible. Yellow area indicates range of hypothetical taxon. (A) Population might be allopatric on older islands having moved between by oversea dispersal, before coming parapatric during LGM and so remaining specific to different islands; (B) Taxon might exist on one island only, expanding its range during LGM and then being partitioned as sea-level rises; (C) Taxon might initially be restricted to alpine environment on one island and colonizing new alpine environment when able during extension of lowered alpine habitat in LGM; (D) Taxon range in former South Island might result in occupation of southern North Island as it forms before LGM.