Fig 1.
Estimated extinction probability of Cypripedium fasciculatum as a function of population size (left), years between surveys (center), and elevation (right).
Shadings around each line represent 95% confidence intervals. Histograms indicate the frequency (labeled on right axis) of mortality (top axis) and survival (bottom axis).
Table 1.
Generalized linear logistic regression model for factors affecting the probability of population survival for C. fasciculatum with coefficient estimates, standard errors, z scores, and p-values.
The resulting model takes the form loge(y/(1—y)) = β0 + β1X1 + β2X2 + β3X3.
Fig 2.
Frequency distribution of population size, years since last survey, and elevation for populations in the land management databases.
Fig 3.
Distribution of Cypripedium fasciculatum in California and Oregon showing the probability of persistence estimated from population size, time since observation, and elevation.
Insets show known locations of the species in the western United States (data from GeoBOB and NRIS-Terra) and a photo of the plant from southwestern Oregon.