The numbers and distribution of subterranean aphids and their exploitation by the ant Lasius flavus (Fabr.)

Abstract. 1. Subterranean aphids in old pasture were found to show extremely clumped distributions with about 3000 aphids (omitting first instars) per ant nest throughout the year. 2. They were generally distributed in and away from the nest mounds, but within the ant's foraging territories. 3. At summer temperatures, more than 3000 first instars are lost from the aphid population per ant nest per day and it is concluded that these are eaten by the ants in addition to some older aphids and the honeydew produced. 4. The aphids may therefore provide enough food to maintain the ants with very little extra needed in the form of other prey.