3.3.5 Mitochondrial Network Analysis
The median joining network analysis using mitochondrial genomes and a
larger sampling of historical whales produced similar results to the
nuclear sequences in showing an absence of clustering of haplogroups
based on the NA geographic origin of the samples (Fig. 3). Additionally,
there appears to be continuity through time as haplogroups are shared
between two of the four present-day NWA samples with whales killed in
the same waters over a century ago. The Antarctic and South Atlantic
whales cluster within the NA blue whales closest to the NWA blue whale
NW-M6. Global geographic structuring using a larger sampling of whales
(154) but a smaller amount of sequence (mitochondrial control region)
was weak or nonexistent (Fig. S1).