Abstract
Colonies of the ant Lasius neoniger have multiple nest entrances that are distributed throughout a colony's foraging area. Associated with each nest entrance is a group of workers that show strong fidelity to that nest entrance. Territorial expansion, as indicated by increases in the number of nest entrances per colony, is correlated with foraging activity. Although there is variation between colonies in the seasonal pattern of territorial expansion, most nests become active in early summer, increase the size of the area foraged until midsummer, and then decrease the number of active nest entrances in late summer. Over the study plot as a whole, the dispersion pattern of nest entrances changed from clumped, or tending to be clumped, in early spring to random in mid-and late summer. Within colonies, nest entrances were significantly overdispersed. Intra-and interspecific competition negatively affected foraging, and workers from a given nest entrance were most successful at retrieving prey less than approximately 15–20 cm from the entrance. The average distance between nest entrances within a colony was 37.7±3.3 cm (mean±95% confidence interval, n=115), which is approximately twice the distance at which workers can retrieve prey. The polydomous nest structure of L. neoniger appears to partition territory within a colony by spatial subdivision of its foragers, and thus may reduce loss of prey to competitors.
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Traniello, J.F.A., Levings, S.C. Intra-and intercolony patterns of nest dispersion in the ant Lasius neoniger: correlations with territoriality and foraging ecology. Oecologia 69, 413–419 (1986). https://doi.org/10.1007/BF00377064
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DOI: https://doi.org/10.1007/BF00377064