First, they aren't different species. All the same species. 
Second, how can you tell an "Italian" bee from any other? 


Great question  since we normal describe them by traits......as well as the
visual.   And the paper you cited actually looked at the genetics.

But my point was that we profile races by traits.  And bees that use large
cavities,  big populations and lots of honey do better further south. Lots
of big cavities in oaks and maples.  Not so many in pines.   A bee in
central MN may have a tough time finding cavities much bigger than 10-12
inches around. Over time these have developed traits that suit the local
environment, such as cooler climes like yours. I belive  Black bees are know
to fly when its cooler??  I know mine won't leave the hive until 55...

 I expect,  (like you I think) that southern bees raised in GA do just fine
in NY or Canada.  Just know that some types are bigger pigs of honey and
larger clusters than other.   Most package bees and southern Nucs are breed
for prolific brood.  More bees the better.  That can be an issue come
winter. Many then blame the bees or the producer.

I have some great huge hives right now from southern queens.( I would say
Italians)  way to big to winter well.  I knew that going in, and will
resolve it before its too cold.  I also swap queens   I replace a lot of
queens in Aug. with carni's part of that understanding the genetic traits. 

I apologize if I misunderstood your point.  Wasn't my plan!
Charles

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