Table 2.
Estimated annual prey kill (fresh weight) of the global spider community assessed with method I
| Biome type | Number of assessments | Prey kill (g m−2 year−1) | Area in m2 | Prey kill of entire area (g year−1) |
|---|---|---|---|---|
| (X) | (Y) | (X) × (Y) | ||
| Tropical forests | 7 | 17.3 | 17.5 × 1012 | 303 × 1012 |
| Temperate and boreal forests | 18 | 9.0 | 24.1 × 1012 | 217 × 1012 |
| Tropical grasslands and savannas | 11 | 4.1 | 27.6 × 1012 | 113 × 1012 |
| Temperate grasslands and Mediterranean shrublands | 8 | 3.6 | 17.8 × 1012 | 64 × 1012 |
| Annual cropland | 13 | 0.25 | 13.5 × 1012 | 3.4 × 1012 |
| Deserts | 3 | 0.6 | 27.7 × 1012 | 16.6 × 1012 |
| Arctic tundra | 5 | 0.7 | 5.6 × 1012 | 3.9 × 1012 |
| Global total (without ice-covered area) | 133.8 × 1012 | 721 × 1012 |
Computation of the prey kill values for each type of biome based on data (spider biomass m−2) from Table 1