Abstract
The classic formulation of optimal foraging theory predicts that a central-place forager will gather more food if it is required to travel farther from the nest to find that food. We examined the foraging behavior of German yellowjackets (Vespula germanica) to determine whether carbohydrate foragers follow this pattern. We trained foragers to collect 2 M fructose solution at 5 or 50 m from the nest and measured the time spent feeding, load size, and the rate of delivery. We show that as a forager’s crop fills during a foraging bout, the amount of solution ingested per second decreased. However, load size did not change as wasps collected food up to 50 m from the nest. Instead, temperature and body size were better predictors of the volume of fructose a forager carried. Finally, the rate of fructose delivered to the nest was higher at warmer temperatures. Due to the fact that wasps gather more food but feed for shorter periods of time at warmer temperatures, we found an overall negative relationship between feeding time and load size. We conclude that the strong effects temperature had on the behavior of V. germanica foragers imply that feeding time may not always be an accurate predictor of the size of the load an individual carries back to the nest. Results from this study suggest that in yellowjacket colonies, foragers can collect and bring disproportionately more food back to the nest during the warmest days of the summer, a time of year when this pest species reaches peak population size during its annual colony cycle.
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Acknowledgments
We are grateful to Jeff and Denise Baylis and to West Madison Agricultural Research Station for allowing us to work with yellowjackets on their properties. We thank Susan Dorst and Doug Thiessen for allowing us to excavate yellowjacket nests from their lawns, and Mark Allington for constructing nest boxes. For help in collecting and setting up nests, we thank Lucas Rifkin and Ken Howard. We also appreciate Lucas Rifkin’s assistance with collecting data. We are also grateful to Dave Stephens’s suggestions on rate of uptake analyses, and Goggy Davidowitz and his lab group for their help on preparing the manuscript. Research supported by Hatch grant no. 4433 to R.L.J. and by the College of Agricultural and Life Sciences, UW-Madison.
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Jandt, J.M., Taylor, B. & Jeanne, R.L. Temperature and forager body size affect carbohydrate collection in German yellowjackets, Vespula germanica (Hymenoptera, Vespidae). Insect. Soc. 57, 275–283 (2010). https://doi.org/10.1007/s00040-010-0082-5
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DOI: https://doi.org/10.1007/s00040-010-0082-5