John, The Salmo revision more or less separates the species that evolved around the North Atlantic Rim from those that evolved around the South Pacific Rim. At least that is how I understand it.
But that is not to say it is BECAUSE of this geography that they were put into these two groups but rather that because species in each of these areas are more related to others in the same region than they are to species in the other region = that is why they are in these two groups. boy that was lousy sentence structure.
Don't quote me on that explanation. It is my interpretation given next to no real familiarity with that literature. I am NOT a systematist nor a phylogenticist, and only most vaguely a true evolutionary biologist. I am an ecologist of some selection of flavors (behavior, populations, communities, landscapes - take your pick) that uses evolutionary principles to make sense of what is out there in the real world.
