Ecological Archives E096-283-A6
Jesse E. D. Miller, Ellen I. Damschen, Susan P. Harrison, and James B. Grace. 2015. Landscape structure affects specialists but not generalists in naturally fragmented grasslands. Ecology 96:3323–3331. http://dx.doi.org/10.1890/15-0245.1
Appendix F. Formula for proximity index.
Formula for proximity index from Mcgarigal (2015):
aijs=area (m) of patch ijs within specified neighborhood (m) of patch ij
hijs =distance (m) between patch ijs and patch ijs, based on patch edge-to-edge distance,
computed from cell center to cell center.
Literature cited
Mcgarigal, K. 2015. Fragstats help v. 4.2. http://www.umass.edu/landeco/research/fragstats/documents/fragstats.help.4.2.pdf.