Supplement 1. R source code for the Brownian bridge movement model (BBMM) that estimates a utilization distribution (UD) for a migration route of a GPS-collared mule deer, as depicted in Fig. 2.

File List

BBMM_supplement.R
– R source code

gps53_spring06.txt
– Input file for R code

readme.txt
– Description of R source code

Description
The BBMM_supplement.R R program uses the Brownian bridge movement model (BBMM) to estimate a 99% utilization distribution of a mule deer migration route.
The gps53_spring06.txt input file contains a sequence of migratory GPS locations collected from Deer#53 during the 2006 spring migration. Additional information is provided in the readme.txt file and the BBMM_supplement.R.
R code is commented for further documentation. Equations for the BBMM and the Brownian motion variance are provided in Horne et al. (2007)a.

a Horne, J. S., E. O. Garton, S. M. Krone, and J. S. Lewis. 2007. Analyzing animal movements using Brownian Bridges. Ecology 88:2354–2363.