Species analysis
Statistical exploration
Classification trees
Variables
Spotted Towhee
Occurred the most disproportionately in hexagons with annual
precipitation more than 1134 mm and April maximum temperature
(hex. max.) of 12-18 �C. Almost equally likely to occur in hexagons
with somewhat less annual precipitation (358-1134 mm), and May
minimum temperature (hex. max.) of 3-8 �C and elevation (hex. avg.)
of less than 1420 ft. Also occur in drier conditions (358 mm), if terrain
is relatively flat and June minimum temperature (hex. max.) is 5-6 �C.
In the driest parts of its range (218-303 mm), it occurred in hexagons
with greater road density. The logistic regression analysis showed
positive or negative association with elevation (hex. avg.), topographic
variation, the extent of public land, April precipitation (hex. avg.),
April precipitation (hex. max.), July precipitation (hex. min.)
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 86.05)
Squares: using ONHP land cover classification (accuracy score: 78.39)
Hexagons: using AVHRR land cover classification (accuracy score: 89.07)
