In a study comparing the population responses of Aedes mosquitoesto experimental removal of larvae at different times following hatching, starting larval density of single-species cohorts was set at 250 newly hatched larvae in 400 milliliters of water, as shown in the experimental containers here. Detritus in the form of oak leaf litter and insect carcasses (typical of that found in containers in nature) was added as a substrate for microbial growth, which forms the food supply of developing Aedes larvae. (Photo by Steven A. Juliano, Ph.D.)