Environmental Engineering Reference
In-Depth Information
Figure 3. Coyote samples. The 477 plague-positive coyote samples, and 2,250 negative samples
were collected.
Environmental Variables
We downloaded the full set of 19 Worldclim bioclimatic variables http://www.world-
clim.org (Table 2). These products are derived from monthly weather station mea-
surements of altitude, temperature, and rainfall. They are biologically meaningful
variables that capture annual ranges, seasonality, and limiting factors useful for niche
modeling (such as monthly and quarterly temperature and precipitation extremes)
[39]. The Worldclim data are at ~1-km 2 spatial resolution and have been averaged
over a 50-year time period from 1950 to 2000. Elevation was not explicitly used in
model construction because it is already used as a covariate in the Worldclim data pro-
duction. For modeling purposes, all environmental variable layers were masked to fit
the extent of the California state outline. These layers were projected to Teale Albers,
NAD 1983 projection.
Table 2. Descriptions of BIOCLIM environmental data.
Variable
Description
Bio1
Annual Mean Temperature
Bio2
Mean Diurnal Range (Mean of monthly (max temp- min temp))
Bio3
lsothermality (P2/P7) (* I 00)
Bio4
Temperature Seasonality (standard deviation * I 00)
Bio5
Max Temperature of Warmest Month
Bio6
Min Temperature of Coldest Month
Bio7
Temperature Annual Range (PS-P6)
Bio8
Mean Temperature of Wettest Quarter
 
Search WWH ::




Custom Search