Task allocation and site fidelity jointly influence foraging regulation in honey bee colonies
Variation in behavior among group members often impacts collective outcomes. Individuals may vary both in the task that they perform and in the persistence with which they perform each task. Although both the distribution of individuals among tasks and differences among individuals in behavioral persistence can each impact collective behavior, we do not know if and how they jointly affect collective outcomes. Here we use a detailed computational model to examine the joint impact of colony-level distribution among tasks and behavioral persistence of individuals, specifically their fidelity to particular resource sites, on the collective tradeoff between exploring for new resources and exploiting familiar ones. We developed an agent-based model of foraging honey bees, parameterized by data from 5 colonies, in which we simulated scouts, who search the environment for new resources, and individuals who are recruited by the scouts to the newly found resources, i.e., recruits. We found that for each value of persistence there is a different optimal ratio of scouts to recruits that maximizes resource collection by the colony. Furthermore, changes to the persistence of scouts induced opposite effects from changes to the persistence of recruits on the collective foraging of the colony. The proportion of scouts that resulted in the most resources collected by the colony decreased as the persistence of recruits increased. However, this optimal proportion of scouts increased as the persistence of scouts increased. Thus, behavioral persistence and task participation can interact to impact a colony's collective behavior in orthogonal directions. Our work provides new insights and generates new hypotheses into how variation in behavior at both the individual and colony levels jointly impact the trade-off between exploring for new resources and exploiting familiar ones.
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