Abstract
Tandem leaders of Pachycondyla tesserinoda mark their way during nest moving. While scouting and foraging for food in an unknown area, chemical orientation is used as well. The origin of the trail substance could not be identified. Secretions of gastral exocrine glands did not induce trail following behavior. Nor do these secretions elicit tandem-following reactions; rather the latter is released by the general body surface odor. The trail substance and the substance used for marking the nest entrance are colony-specific. Moreover, individual tandem leaders recognize and show a preference for their own trails. This extraordinary effect is independent of the age of the trail. P. tesserinoda workers search individually for food and new nest sites. Targets which are important for the colony are directly shown to nestmates by tandem running. Due to this type of foraging and scouting individual-specific trails may be advantageous for this ant.
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