There's also:

Parker et al., (2010) Ecological Adaptation of Diverse Honey Bee (Apis mellifera) Populations. PLoS One 5:e11096

which shows, using proteome profiling, that bees from diverse geographic regions have differences that might be expected to occur as a result of local adaptation. 

Cold-adapted bees e.g. those from Saskatchewan (SK1, SK2), exhibited much higher levels of proteins involved in heat production in the mitochondria. In contrast, bees from warmer climates e.g. Hawaii (HI), showed higher levels of proteins involved in biosynthesis/folding and degradation of proteins.

But ... it's worth noting that there's still a gap between this and a demonstration that these bees survive better in the environment to which they are 'adapted'.

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