Reference:

Starks, P. T., & Reeve, H. K., 1999. Condition-based alternative reproductive tactics in the wool-carder bee, Anthidium manicatum. Ethology Ecology & Evolution, 11(1), 71-75.

URL:

http://ase.tufts.edu/biology/labs/starks/publications/PDF/6.StarksReeve1999.pdf

---