Colony size and reproduction in the western harvester ant, Pogonomyrmex occidentalis

• Published in: Insectes sociaux Vol. 47; no. 3; pp. 249 - 255
• Main Authors: COLE, B. J, WIERNASZ, D. C
• Format: Journal Article
• Language: English
• Published: Basel Springer 01.01.2000
• Subjects: Animal and plant ecology; Animal, plant and microbial ecology; Animals; Biological and medical sciences; Demecology; Formicidae; Fundamental and applied biological sciences. Psychology; Pogonomyrmex occidentalis; Protozoa. Invertebrata; Formicidae; Insecta; Population number; Social insect; Formicoidea; Reproduction; Nuptial flight; Arthropoda; Colony; Population dynamics; Density dependence; Measurement method; Hymenoptera; Invertebrata; Aculeata
• ISSN: 0020-1812; 1420-9098
• DOI: 10.1007/PL00001711

We report data from a four-year field study on the relationship between colony size and reproduction in the western harvester ant, Pogonomyrmex occidentalis. In all years, the likelihood of reproduction significantly increased with increasing size in both field censuses during naturally-occurring mating flights and experimentally-watered colonies whose entire reproductive output was collected. However, the total amount of reproductive biomass was unrelated to colony size. We describe the size threshold for reproduction in P. occidentalis and show that it varies across years. Once colonies become reproductively mature, they reproduce consistently although not in every year. We describe a method for collecting the entire reproductive output for desert ants whose reproductive flights are cued by rainfall.