From Physiological Entomology:
Rojas, Julio C., Brindis, Yolanda, Malo, Edi A. & Cruz-López, Leopoldo (2004) Influence of queen weight and colony origin on worker response in Solenopsis geminata. Physiological Entomology 29 (4), 356-362.
ABSTRACT: The influence of weight and colony origin of the queen of Solenopsis geminata (F.) (Hymenoptera: Formicidae) on worker attraction is studied under laboratory conditions. In the first experiment, worker response to individual queens of different weight from the same colony is evaluated. Heavier queens are more attractive than smaller queens to their own workers. In subsequent experiments, the colony origin effect is investigated and worker response to a pair of queens of the same weight from the same or different colonies is compared. When queens are from the same colony, workers do not show a significant preference between queens. However, when queens are from a different colony, workers are significantly more attracted to their own queen than to the foreign queen. Finally, the response of workers to queens of different weight from the same or different colonies is investigated. In both cases, workers are significantly more attracted to a heavier queen than a lighter queen, even if the lighter queen is their own queen. A putative pheromonal component (E)-6-(1-pentenyl)-2H-2-pyranone, is not positively correlated with queen weight.