The bee populations of Thrace, Macedonia, Central Greece and the Peloponnese are completely distinguishable from those on the island of Crete. Studies of bee populations in 2005[citation needed] from various areas of Greece (Ikaria, Kasos, Kythira, Phthiotis, Macedonia) and Cyprus analyzing mitochondrial DNA segments and finding differences in enzymatic restrictions, resulting in Apis mellifera adami, Apis mellifera cecropia and Apis mellifera cypria having a haplotype which differs from the Macedonian Apis mellifera haplotype, this subspecies being the most distant of all.
Non-recognition of the Ruttner hypothesis
Ruttner distinguished A. m. macedonica from A. m. carnica in 1988, assigning a geographical distribution to the subspecies in northern Greece, Bulgaria, Romania and (perhaps) part of the former USSR. Other naturalists[citation needed] recognize Ruttner's subspecies as A. m. rodopica and A. m. carpatica.