Table 1 Mean (standard deviation) relative contributions of major explanatory covariates to the spatial distribution of CCHFV and RVFV, estimated by BRT models

Environmental

Shrubland

2.61 (1.77)

–

Agriculture

1.92 (1.16)

–

Grassland

1.33 (1.10)

14.51 (1.54)

Forest

–

6.12 (0.49)

Sparse vegetation

–

3.58 (0.20)

Elevation

–

9.31 (0.76)

Minimum distance to nearest bodies of water

–

5.54 (0.19)

Normalized difference vegetation index

–

4.81 (0.38)

Ecoclimatic

Annual mean temperature

7.92 (2.48)

–

Precipitation seasonality

6.24 (2.43)

–

Temperature seasonality

4.00 (1.72)

–

Mean precipitation in previous month

–

21.17 (0.45)

Mean temperature in previous month

–

8.06 (0.64)

Biological

Population density

2.28 (1.61)

5.31 (0.34)

Livestock density^a

–

21.58 (1.13)

Goat density

3.23 (1.56)

–

Sheep density

1.89 (1.26)

–

Presence possibility of H. asiaticum

68.58 (4.22)

–