Ecological Archives A017-028-A1

Leif-Matthias Herborg, Christopher L. Jerde, David M. Lodge, Gregory M. Ruiz, and Hugh J. MacIsaac. 2007. Predicting invasion risk using measures of introduction effort and environmental niche models. Ecological Applications 17:663–674.

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:
http://ipcc-ddc.cru.uea.ac.uk/obs/get_30yr_means.html

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:
http://edc.usgs.gov/products/ elevation/gtopo30/hydro/index.html

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:
http://www.nodc.noaa.gov/ OC5/WOA01/pr_woa01.html

Mean river temperature (˚C)

10 km × 10 km

Generated from the global environment monitoring system at:
http://www.gemswater.org/publications/ index-e.html

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.



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