Investigating the Potential Origins of a Newly Established Goosander (Mergus Merganser) Breeding Population in Ireland

Fig. 2.

Phylogeny of goosander COI sequence data. A) Maximum likelihood topology with bootstrap values >50% for internal nodes indicated. B) Maximum likelihood topology with branch length data. Outgroup sequences given in black. Goosander sequences are highlighted by geographic group: Eurasia in red; Scandinavia/Britain in blue, with Ireland samples in green; Pacific Rim in purple; North America in orange. See text for details. While topologies within each of these groups are ambiguous due to short internal branch lengths, geographic regions form distinct cohorts. The Irish goosander samples clearly fall within the group from Scandinavia and Great Britain. And this group is clearly distinct from North American and the Pacific Rim.