Table 2. Habitat selection by Secretarybirds observed in the Coordinated Avifaunal Roadcounts (CAR) project in the 16 precincts for which there were sufficient data, in summer (S) and winter (W) counts.

Precinct	Season	Jacobs index	Natural	Transformed	Sign test p value
Eastern Cape Coastal	S	0.759	6	2	0.157
	W	0.663	10	0	0.002**
Eastern Cape Karoo	S	0.387	19	2	<0.001***
	W	0.715	22	1	<0.001***
Eastern Karoo	S	0.136	64	2	<0.001***
	W	–0.058	49	2	<0.001***
Gauteng	S	0.220	9	3	0.083
	W	0.380	16	4	0.007**
Mpumalanga	S	0.481	6	1	0.059
	W	0.028	6	5	0.763
North-eastern Eastern Cape	S	0.277	17	5	0.011*
	W	–0.028	13	10	0.532
North-eastern Free State	S	0.454	21	8	0.016*
	W	0.430	36	12	0.001**
North-western Free State	S	0.923	14	0	<0.001***
	W	0.343	16	8	0.102
Northern KwaZulu-Natal	S	0.654	17	2	0.001**
	W	0.307	14	6	0.074
Overberg	S	0.223	21	11	0.077
	W	0.477	20	12	0.157
Southern Free State	S	0.606	93	12	<0.001***
	W	0.656	106	5	<0.001***
Steenkampsberg	S	0.055	8	1	0.020*
	W	–0.061	2	5	0.257
Southern KwaZulu-Natal	S	0.558	18	3	0.001**
	W	0.489	20	3	<0.001***
Swartland	S	0.175	6	5	0.763
	W	0.160	6	7	0.782
Wakkerstroom	S	0.429	6	3	0.317
	W	0.344	9	1	0.011*
Western KwaZulu-Natal	S	1.000	9	0	0.003**
	W	0.522	6	1	0.059

Jacobs index D values indicate selection for natural habitats if positive, and for transformed land if negative. The Natural and Transformed columns give the numbers of routes on which Secretarybirds showed a preference for natural or transformed habitats respectively. Sign test p values refer to tests of whether the number of routes with positive or negative Jacobs index D values was significantly different from that expected if zero selection had been shown.