Table 3.

Comparison of observed and expected spatial distributions based upon the capture-zone model

Population examined		Ratio of measuring/ capture-zone square size1	Number of grid squares containing structures				Chi-square
			0	1	2	33		p
97–86	obs2	3	15	40	38	10	0.97	0.81 3 df4
	exp2		13.0	38.7	38.5	12.8
97–142	obs	2	19	57	26	2	1.10	0.58 2 df
	exp		21.5	52.0	31.2	0
916–150	obs	2	32	56	16	2	0.66	0.72 2 df
	exp		32.8	52.3	20.8	0
916–444	obs	2	45	49	11	1	0.076	0.96 2 df
	exp		44.9	48.2	12.9	0
920–125	obs	2	27	54	23	2	0.113	0.95 2 df
	exp		26.5	53.0	26.5	0
920–400	obs	3	36	47	22	1	1.39	0.71 3 df
	exp		37.0	46.6	19.6	2.7

1. The minimum link length (Y intercept from Table 2) from each population was used as as a guide to the length of a side of the capture zone square. The measuring square side length from Figure 6 was 5.5 mm for all populations. Ratios of 2 and 3 were chosen for illustration purposes with no attempt to optimize the fit to observed values. 2. exp are values predicted by the capture zone model, obs are values from Table 1. 3. Squares containing 4 (1), 5 (2) and 6 (1) are included for population 97–86. 4. df are the degrees of freedom used to obtain the p values above them.