Appendix A. Source of environmental coverages used in the predictions..
TABLE A1. Source of environmental coverages used in the predictions. Environmental coverages tested for their contribution to predictive accuracy. Underlined variables were included in the GARP model predicting the potential range of Chinese mitten crabs in North America.
Variable |
Grid size |
Source |
Ground frost frequency (number of days per year) |
0.5˚ × 0.5˚ |
The climate research unit global climate dataset at: |
Maximum temperature (°C) |
0.5˚ × 0.5˚ |
|
Mean temperature (°C) |
0.5˚ × 0.5˚ |
|
Minimum temperature (°C) |
0.5˚ × 0.5˚ |
|
Wet day index (number of days of precipitation per year) |
0.5˚ × 0.5˚ |
|
Precipitation (mm/day) |
0.5˚ × 0.5˚ |
|
Topographic index (wetness index based on flow accumulation and slope) |
1 km × 1 km |
The U.S. geological survey Hydro1k elevation derived database at: |
Slope (maximum change in elevation between a cells) |
1 km × 1 km |
|
Aspect (direction of the slope) |
1 km × 1 km |
|
River discharge (km3/yr) |
0.5˚ × 0.5˚ |
From Xenopoulos et al. 2005 |
Spring ocean surface temperature (˚C) |
1˚ × 1˚ |
Generated from the NOAA world ocean atlas 2001 at: |
Mean river temperature (˚C) |
10 km × 10 km |
Generated from the global environment monitoring system at: |
LITERATURE CITED
Xenopoulos, M. A., D. M. Lodge , J. Alcamo, M. Märker, K. Schulze, and D. P. van Vuuren. 2005. Scenarios of freshwater fish extinctions from climate change and water withdrawal. Global Change Biology 11:1557–1564.