Abstract
Spatial distribution of Dipodomys spectahilis mounds on a rectangular 47 hectare area of short-grass prairie was determined using nearest neighbor and Poisson analyses. A total of 121 mounds was mapped (density 2.57 mounds per hectare) of which 79 were active. A nearest neighbor analysis of active and inactive mounds together revealed a significantly uniform distribution. Active mounds alone were also found to be regularly dispersed. Numerous Poisson analyses were made with sample quadrats of various sizes. This method also showed the distribution to depart significantly from randomness toward uniformity as the quadrat size was reduced. As quadrats were made still smaller, the Poisson analyses produced inconsistent results. This suggests that the nearest neighbor method might be a more reliable measure of compound distributions. The regularity evident in the mound distribution indicates that D. spectabilis minimizes intraspecific interactions by spatial means.
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