Yellowjackets (Vespula pensylvanica) thermoregulate in response to changes in protein concentration
M A Eckles1, E E Wilson, D A Holway
1Division of Biological Sciences, Section of Ecology, Behavior, and Evolution, University of California, San Diego, Mail Code 0116, 9500 Gilman Drive, La Jolla, CA 92093-0116, USA. meckles@biomail.ucsd.edu
Abstract:
Social insects can modulate body temperature to increase foraging efficiency; however, little is known about how the relative value of protein resources affects forager body temperature. Such regulation may be important given that colony growth is often limited by protein availability. In this paper, we present what are, to our knowledge, the first data for social insects showing that thoracic temperatures (T (th)) of foragers increase with the protein content of food resources. In an introduced population of western yellowjacket (Vespula pensylvanica), we measured T (th) of foragers collecting high-quality protein (100% canned chicken) and low-quality protein (50% canned chicken, 50% indigestible alpha-cellulose by volume) at different ambient air temperatures (T (a)). Wasps foraging on 100% chicken consistently exhibited higher T (th) compared to wasps foraging on 50% chicken. After correcting for T (a), the mean T (th) for wasps collecting 100% chicken were 1.98 degrees C higher than those of individuals collecting 50% chicken. We suggest that this mechanism may increase foraging efficiency in this and other social wasp species.
Related Concept Videos
Osmoregulation in Insects
Thermoregulation
Background and Environment Affect Phenotype
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Thermosensation
Regulation of Bacterial Virulence


