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The influence of forager number and colony size on food distribution in the odorous house ant, Tapinoma sessile

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Abstract

Stomodeal trophallaxis plays a major role in ant colony nutrition and communication. While the rate of food distribution at the individual level (worker to worker) is rapid, factors affecting the rate of food distribution at the colony level remain poorly understood. We used the odorous house ant, Tapinoma sessile (Say), as a model species to investigate the factors affecting the rate of spread of liquid carbohydrate food throughout a colony. To track the movement of the food we used protein marking and double antibody sandwich enzyme-linked immunosorbent assay, DAS-ELISA. Increasing colony size while keeping the number of donor workers constant significantly decreased the number of individuals testing positive for the marker. After 8 h of trophallactic interactions with ten donors, 92 ± 5% of recipient workers tested positive in a colony of 125 and 38 ± 5% tested positive in a colony of 1,000. Interestingly, as colony size increased and the percentage of workers testing positive decreased, the proportion of workers actually receiving food increased. Food originating from a single donor fed approximately 12 individuals in colonies comprised of 125 recipients and approximately 38 individuals in colonies comprised of 1,000 recipients. Thus, the per capita consumption of food decreased as colony size increased, most likely because the amount of food reaching the colony was limited. Increasing the number of donors while keeping colony size constant significantly increased the number of recipient ants testing positive for the marker. As the number of donor workers doubled, the percentage of recipients testing positive more than doubled suggesting that the number of individuals receiving food increases with increasing colony size, while the per capita amount of food decreases. When food was available ad libitum and in close proximity to the nest, numerous workers fed directly at the food source. This dramatically increased the rate and the extent of food distribution to both the workers and the queens and colony size had no significant effect on the spread of the marker in the workers or the queens. The rate and the extent of food distribution at the colony level may depend on a number of factors including the number of successful foragers, the size and density of the recipient colony, and the recipient caste.

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Acknowledgments

We thank J. Billen, J. D. Holland, and two anonymous reviewers for helpful comments on the manuscript, G. DePalma and Z. Zhang for advice on data analysis, and C. Bacon and M. Nour for assistance in the lab. This study was supported in part by the Industrial Affiliates Program at Purdue University.

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  1. Department of Entomology, Purdue University, West Lafayette, IN, 47907, USA

    G. Buczkowski & G. Bennett

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  1. G. Buczkowski
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  2. G. Bennett
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Correspondence to G. Buczkowski.

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Buczkowski, G., Bennett, G. The influence of forager number and colony size on food distribution in the odorous house ant, Tapinoma sessile . Insect. Soc. 56, 185–192 (2009). https://doi.org/10.1007/s00040-009-0011-7

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