This is just my opinion based on my experience hunting all five of the North American subspecies on numerous occasions. There are definitely discernable differences in the gobbles of the subspecies, although the intergradations are sometimes a bit muddled.
Other observations I have made:
Goulds turkeys tend to have lower "voices" overall and tend to yelp more slowly, in general.
Merriams turkeys tend to yelp more slowly than the rest of them besides Goulds as noted above.
The fly-down cackle seems to be more prominent in the more easterly subspecies than in the western subspecies. (from what I have seen, Merriams turkeys almost never cackle)
Cutting seems to be much more commonly heard in the eastern birds.
Of course, there are exceptions to all of this, but again, these are just my observations from my own personal experiences with the subspecies.
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