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1 March 2006 Relationship Between Food Stores and Foraging Behavior of Pheidole ceres (Hymenoptera: Formicidae)
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In temperate climates, animals that produce long-term food caches must forage simultaneously for nutrients to survive, reproduce, and collect enough stores to survive the winter. Thus, an animal is simultaneously makes two foraging choices 1) what nutrients to collect for its immediate needs and 2) what food items should be stored. The cues the animal uses to make these two decisions should differ. This study examined the nutrient content of a seed-caching ant, Pheidole ceres (Wheeler) (Hymenoptera: Formicidae), to determine whether the nutrients found in stored seeds were different from the cues used to forage. The quantity of carbohydrates, lipids, amino acids, and proteins was measured in individual ants and seeds taken from eight P. ceres field colonies once a month from April to October. The relative nutrient levels were compared with the known foraging preferences of P. ceres at different times of the year. Seeds serve as the primary lipid and protein storage vessels, whereas the workers store amino acids and carbohydrates. The levels of carbohydrates and amino acids matched the foraging preferences for carbohydrates and proteins, respectively. This pattern suggests that the ants use nutrients that are not abundant in seeds as forging cues.

Timothy M. Judd "Relationship Between Food Stores and Foraging Behavior of Pheidole ceres (Hymenoptera: Formicidae)," Annals of the Entomological Society of America 99(2), (1 March 2006).[0398:RBFSAF]2.0.CO;2
Received: 1 November 2005; Accepted: 1 December 2005; Published: 1 March 2006

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