Abstract
Seasonal and spatial variation in depth and diameter of 399 burrow systems of Geomys attwateri were determined. The hypothesized role of precipitation, air temperature, soil composition, and abundance of dietary resources in depth and diameter of burrows was assessed by multiple-regression analysis. Burrow diameter did not vary spatially or temporally, but was significantly correlated with body mass of pocket gophers. Burrow depth did not vary spatially, but varied temporally; burrows were more shallow in spring and fall. We hypothesized that pocket gophers foraged at different depths seasonally in response to availability of roots of annual monocots.
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