Table 1. Comparisons of open and fenced pastures small mammal burrow densities, stratified by landscapes*.

Landscape	Pasture type	No. observations	Mean rank of densities	Sum rank of densities	Mann-Whitney U	Z	Asymptomatic p (2-tailed)
Valley	Open	616	439.07	270,464.50	63,715.500	–2.784	0.005
	Fenced	234	389.79	91,210.50
Flat land	Open	175	109.38	19,141.00	634.000	–5.819	<0.001
	Fenced	25	38.36	959.00
Piedmont	Open	155	96.91	15,020.50	2,930.500	–1.643	0.100
	Fenced	45	112.88	5,079.50
Valley entrance	Open	180	103.83	18,690.00	1,200.000	–2.833	0.005
	Fenced	20	70.50	1,410.00

*Density, no. burrows per 200 m² of pasture.