Appendix E. HSI equations (Snaith et al. 2004). HSI1 is the original HSI Model II equation (Allen et al. 1987). Snaith et al. (2004) modified HSI2 and HSI3 to explore the assumption that aquatic resources may not be a critical habitat component (Telfer 1984). To model the known importance of the proximity of food and cover, Snaith et al. modified SI1 (SI1m) to include only forage areas located within 200 m of cover; HSI4, HSI5 and HSI6 substitute SI1m for SI1 into HSI1, HSI2 and HSI3, respectively (2004). (SI1 = forage, SI2 = softwood cover, SI3 = mixedwood cover, SI 4 = wetlands, and SI1m = forage areas located within 200 m of cover) .
Equation |
Explanation |
|
HSI1 = (SI1 SI2 SI3 SI4)1/4 |
original equation following Allen et al. (1987) |
|
HSI2 = (SI1 SI2 SI3)1/3 |
wetlands removed |
|
HSI3 = [SI1 (SI22) (SI32)]1/5
|
wetlands removed and cover weighted more heavily |
|
HSI4 = (SI1m SI2 SI3 SI4)1/4
|
same as HSI1 but using SI1m only includes forage near cover |
|
HSI5 = (SI1m SI2 SI3 )1/3
|
same as HSI2 but using SI1m only includes forage near cover |
|
HSI6 = [SI1m (SI22) (SI32)]1/5
|
same as HSI3 but using SI1m only includes forage near cover |
LITERATURE CITED
Allen, A. W., P. A. Jordan, and J. W. Terrell. 1987. Habitat suitability index models: moose, Lake Superior region. U. S. Department of Interior Biological Report 82:1–47.
Snaith, T. V., K. F. Beazley, F. MacKinnon, and P. N. Duinker. 2004. Preliminary habitat suitability analysis for moose in mainland Nova Scotia, Canada. Alces 38:73–88.
Telfer, E. S. 1984. Circumpolar distribution and habitat requirements of moose (Alces alces). Pages 145–182 in R. Olson, R. Hastings, and F. Geddes, editors. Northern ecology and resource management. University of Alberta Press, AB, Canada.