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The environmental impact of crayfish biopedoturbation on a floodplain : Roanoke River, North Carolina Coastal Plain, U.S.A

Butler D. R.

Landform Analysis

2002

Vol. 3

35--40

A terrestrial crustacean, the crayfish, creates widespread fine-scale landforms (mounds or "chimneys") on the floodplain of the Roanoke River in eastern North Carolina, U.S.A. These mounds are typically 12 cm high and 8 cm in diameter, and are composed of extremely high concentrations of clay. Non-crayfish-affected soils on the floodplain, regardless of coarser-scale landform type, are dominated by sand, illustrating that crayfish are a primary mechanism for concentrating clay and creating spatial heterogeneity on the floodplain.

Site locations and characteristics of miniature patterned ground, eastern Glacier National Park, Montana, U.S.A.

Butler D. R., Malanson G. P.

Landform Analysis

1999

Vol. 2

45--49

We examined a total of 68 sites with miniature polygonal patterned ground above treeline, along and east of the Continental Divide in Glacier National Park, Montana, USA. Patterned ground develops at three geographic site-types: convex uplands; concave mountain passes and cols; and valleyside slopes. Data were collected at each site to characterize the patterned ground morphometry. Morphometry was similar regardless of site-type, and occurrence was dependent on the presence of fine-grained material on older solifluction terraces or sorted nets.