Published 1964-01-01
Abstract
The population of mound nests of Formica opaciventris, under observation since 1957, was again examined. Since 1957 the total population has declined 16% with corresponding decrease in the proportion of more active mounds. Average mortality rate is 10.4%; average birth rate, 9.9%. Brood was present in 85% of mounds. Project Number 80.