Table 1.
Possible determinants of spatial variation in sampling effort in each province of South Africa. Distance to sampling hub and distance to major road represent accessibility, whereas the other variables describe the characteristics of grid cells. T‐values and level of significance are given
| Province/Region | Distance to hub | Distance to road | Protected area | Urban area | Cultivation area | Mean annual precipitation | Mean summer temperature | Mean winter temperature |
|---|---|---|---|---|---|---|---|---|
| Gauteng 4D | −6.69**** | −0.17 n.s. | 4.64**** | 2.89** | 0.66 n.s. | 1.41 n.s | 2.49* | 0.13 n.s. |
| Mpumalanga | −4.34**** | −1.83 n.s. | 4.79**** | 1.43 n.s. | −1.06 n.s. | 0.86 n.s. | 1.86 n.s. | −0.91 n.s. |
| Limpopo | −1.66 n.s. | −4.12**** | 7.04**** | 2.31* | −2.75** | 1.81 n.s. | 2.23* | 1.61 n.s. |
| North West | −9.73**** | −2.72** | 10.35**** | 0.71 n.s. | −0.58 n.s. | 1.48 n.s. | 1.65 n.s. | 2.74** |
| Free State | −6.21**** | −3.97*** | 6.73**** | 2.60** | −2.73** | 1.69 n.s. | 0.93 n.s. | 0.73 n.s. |
| KwaZulu‐Natal | −4.22**** | −4.49**** | 7.02**** | 4.01*** | 3.20** | 1.81 n.s. | 1.05 n.s. | −0.73 n.s. |
| Eastern Cape | −4.49**** | −6.02**** | 5.42**** | 3.06** | 1.88 n.s. | 0.69 n.s. | 1.16 n.s. | 5.18**** |
| Western Cape | −2.60** | −3.56*** | 3.07** | 3.82*** | 1.15 n.s. | 1.16 n.s. | 1.08 n.s. | 4.72**** |
| Northern Cape | −0.61 n.s. | −5.23**** | 10.68**** | 3.70*** | 5.76**** | 3.22** | −0.13 n.s. | 1.86 n.s. |
Symbols: n.s. p > .05; *p < .05; **p < .01; ***p < .001; ****p < .0001.