Table 1.
Potential landscape, climate and host predictors considered in the analysis of bluetongue outbreaks in sheep in South India with mean values ± standard deviation (s.d.) across districts (see Methods for data sources).
| Category | Predictor name (abbreviation) | Description and units of predictor | Mean ± s.d. |
|---|---|---|---|
| Landscape | post-flooding or irrigated croplands (irrig. crop) | Areal coverage per district of post-flooding or irrigated croplands, class 11 from the Globcover 2009 dataset in km2 | 1395 ± 1218 |
| rainfed croplands (rain crop) | Areal coverage per district of rainfed croplands, class 14 from the Globcover 2009 dataset in km2 | 3440 ± 2691 | |
| mosaic cropland and vegetation (crop-veg mosaic) | Areal coverage per district of mosaic cropland and vegetation (grassland/shrubland/forest mix) with 50–70% cropland, class 20 from the Globcover 2009 dataset in km2 | 1176 ± 1437 | |
| mosaic cropland and vegetation (veg-crop mosaic) | Areal coverage per district of mosaic cropland and vegetation (grassland/shrubland/forest) with 50–70% vegetation, class 30 from the Globcover 2009 dataset in km2 | 297 ± 368 | |
| open broad-leaved deciduous forest (open decid.) | Areal coverage per district of open broad-leaved deciduous forest, class 40 from the Globcover 2009 dataset in km2 | 417 ± 806 | |
| closed broad-leaved deciduous forest (closed decid.) | Areal coverage per district of closed broad-leaved deciduous forest, class 50 from the Globcover 2009 dataset in km2 | 406 ± 589 | |
| urban areas and artificial surfaces (urban) | Areal coverage per district of urban areas and artificial surfaces, class 190 from the Globcover 2009 dataset in km2 | 47 ± 71 | |
| Climate | annual rainfall amount (ann_rain) | Average annual rainfall amount per district over the study period in mm | 1768 ± 468 |
| south west monsoon rainfall amount (sw_rain) | Average annual amount of rainfall each year falling in the south west monsoon period (June to September) per district (2004–2010) in mm | 955 ± 410 | |
| north east monsoon rainfall amount (ne_rain) | Average annual amount of rainfall each year falling in the north east monsoon period (October to December) per district (2004–2010) in mm | 54 ± 51 | |
| mean annual temperature (ann_temp) | Average annual temperature across the pixels in a district (1950–2000) in 0.1 °C | 267 ± 18 | |
| Host | buffalo (buffalo) | Summed number of animals per district of buffalos from the 2007 livestock census | 4.98 ± 0.71 |
| non-descript sheep (nsheep) | Summed number of animals per district of sheep of non-descript breeds of from the 2007 livestock census | 4.78 ± 0.99 | |
| exotic and cross-bred sheep (esheep) | Summed number of animals per district of sheep of exotic and cross-breeds from the 2007 livestock census | 2.19 ± 1.65 | |
| indigenous cattle (icattle) | Summed number of animals per district of cattle of indigenous breeds from the 2007 livestock census | 5.20 ± 0.57 | |
| cross-bred cattle (cbcattle) | Summed number of animals per district of cattle of cross-breeds from the 2007 livestock census | 4.78 ± 0.67 | |
| goats (goats) | Summed densities per district sheep of goats from the 2007 livestock census | 5.24 ± 0.69 |