Ecological Archives A022-047-A1
Stephen F. Spear, Charles M. Crisafulli, and Andrew Storfer. 2012. Genetic structure among coastal tailed frog populations at Mount St. Helens is moderated by post-disturbance management. Ecological Applications 22:856–869.
Appendix A (Table A1). Variables used in least-cost (LC) path development and/or as independent variables in regression models.
|Variable||Units||LC path||Data Source(s)||Resolution||
along LC paths
|Topographic distance||m||Yes||Digital Elevation Model (DEM)||30 × 30 m||Sum|
National Land Cover Dataset (1)
Gifford Pinchot National Forest (2)
|30 × 30 m||not included|
|m||No||NLCD 2001 (1)||30 × 30 m||Sum|
|Canopy Cover||percent||No||NLCD 2001 (1)||30 × 30 m||Weighted avg.|
|Heat Load Index (hli)||none||No||DEM (3)||30 × 30 m||Weighted avg.|
|Slope||degrees||No||DEM||30 × 30 m||Weighted avg.|
|Frost-free period (ffp)||days||No||spline-based model (4)||1 × 1 km||Weighted avg.|
Growing season (Apr–Sep)
|mm||No||spline-based model (4)||1 × 1 km||Weighted avg.|
1. Homer, C., C. Huang, L. Yang, B. Wylie, and M. Coan. 2004. Development of a 2001 national landcover database for the United States. Photogrammatic Engineering and Remote Sensing 70:829–840.
2. Gifford Pinchot National Forest. 1998. Stream. USDA Forest Service, Gifford Pinchot National Forest.
3. McCune, B., and D. Keon 2002. Equations for potential annual direct incident radiation and heat load. Journal of Vegetation Science 13:603–606.
4. Rehfeldt, G. E. 2006. A Spline Model of Climate for the Western United States, General Technical Report RMRS-GTR-165. Department of Agriculture, Forest Service, Rocky Mountain Research Station. Fort Collins, CO US.
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