Mixed colonies of ants (Formica fossaceps Buren and Formica obscuriventris clivia Creighton) offer unique opportunities to determine the extent to which two species living together share a single communal life. The proportion of workers of the two species present in a single colony differs from colony to colony but is relatively constant over periods lasting up to 16 years. Worker ants from four pure and from four mixed colonies have been measured with the scape as an index of size. The same size series of workers is found in pure and in mixed colonies, but the relative proportion of workers of different sizes in mixed colonies is similar within a given colony from year to year. In certain colonies the mean size of the two species is alike, but in others it is different. Whether these differences are trophogenic or blastogenic has not been determined.
Proceedings of the Iowa Academy of Science
©1962 Iowa Academy of Science, Inc.
King, R. L. and Sallee, R. M.
"Further Studies on Mixed Colonies in Ants,"
Proceedings of the Iowa Academy of Science, 69(1), 531-539.
Available at: https://scholarworks.uni.edu/pias/vol69/iss1/83