Species analysis
Statistical exploration
Classification trees
Variables
Green-tailed Towhee
Occurred the most disproportionately in hexagons with elevation (hex.
avg.) of 1507-2002 ft., especially in southern Oregon hexagons with
little or no subalpine fir - lodgepole pine montane conifer. At
somewhat lower elevation (hex. avg. 1158-1507 ft.), its distribution at
southern latitudes within the state was associated mostly with May
maximum temperature (hex. avg.) of 10.79-18.21� C, whereas farther
north its distribution is associated more with April minimum
temperature (hex. min.) of -1 to --2� C. At the lowest elevation (hex.
avg. 440-1158 ft.), its distribution is similarly associated with April
minimum temperature (hex. min. but a broader range of -6 to -1� C),
as well as with July precipitation (hex. med.) of 5-11 mm. The logistic
regression analysis showed positive or negative association with mixed
deciduous forest (Siskiyou Mtns.), mixed conifer forest (Douglas-fir
dominant), elevation (hex. avg.), number of land cover types, April
minimum temperature (hex. avg.), April maximum temperature (hex.
min.), July precipitation (hex. med.), the extent of public land, and-to
a lesser degree-alpine.
Classification trees
Hexagons: using ONHP land cover classification (accuracy score: 85.05)
Squares: using ONHP land cover classification (accuracy score: 89.82)
Hexagons: using AVHRR land cover classification (accuracy score: 85.05)
