Abstract
The populations of 6 sympatric species of detrivorous beetles were sampled over a 4-yr period at a site in the northern Mojave Desert. Data on precipitation, ambient temperature, soil moisture, and plant biomass were gathered simultaneously. The amount of summer rainfall was found to be a factor associated with the abundance of all species. Temperatures affected the phenology of spring emergent species. None of the populations responded to radical changes in plant productivity.