Ruttner compared isolated Italians from Kangaroo Island, Australia
and Black Bees from Tasmania, with exactly known importation date
(1825 and 1835 respectively) with data on ligustica and mellifera
from Europe. No significant difference was found and mellifera from
Tasmania turned out to be less hybridized than their parents in
Britain. from "Biogeography and Taxonomy of Honeybees," 1988.