Table 2.
Outcomes of repeated‐measures linear regressions and GLMMs of A. utahensis density and demographic rates versus ENM‐predicted suitability, study year, and the interaction of suitability and year (where applicable)
| Suitability | Suitability2 | |||||
|---|---|---|---|---|---|---|
| df | F/χ 2 | p | df | χ 2 | p | |
| Southern, Central, and Northern Sites | ||||||
| ln (Overall Density) (2016 only) | 1, 8 | 2.57 | .15 | 1, 8 | 6.16 | .04 |
| ln (Seedling Density) (2016 only) | 1, 8 | 3.96 | .08† | 1, 8 | 4.91 | .06† |
| ln (Reproductive + Juvenile Plant Density) | 1, 8 | 3.08 | .12 | 1, 8 | 10.88 | .01 |
| ln (Reproductive Plant Density) | 1, 8 | 3.87 | .08 | 1, 8 | 17.23 | .003 |
| ln (Juvenile Plant Density) | 1, 8 | 1.69 | .23 | 1, 8 | 3.80 | .09† |
| Basal Rosette Area | 1, 9 | 0.33 | .58 | |||
| ln (Per Capita Seeds) | 1, 9 | 1.36 | .27 | |||
| Suitability | Suitability2 | Census Year | Suitability* Census Year | Suitability2* Census Year | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| df | F/χ 2 | p | df | F/χ 2 | p | df | χ 2 | p | df | χ 2 | p | df | χ 2 | p | |
| Central and Northern Sites Only | |||||||||||||||
| ln (Per Capita Seeds) | 1 | 1.71 | .19 | 2 | 1.52 | .47 | 2 | 1.07 | .59 | ||||||
| Cumulative Germination (2014–2016) | 1, 3 | 4.96 | .11 | 1, 3 | 24.78 | .02 | |||||||||
| Germination from Seed Bank | 1, 5 | 8.36 | .03 | ||||||||||||
| sqrt(Basal Rosette Growth) | 1 | 0.28 | .60 | 2 | 8.36 | .02 | 2 | 4.44 | .11 | ||||||
| ln (Basal Rosette Area: Surviving Seedlings) | 1 | 2.13 | .14 | 2 | 4.55 | .10 | 2 | 1.39 | .50 | ||||||
| Annual Survival (All Life Stages) | 1 | 3.54 | .06† | 1 | 4.38 | .04 | 2 | 4.60 | .10 | 2 | 4.03 | .13 | 2 | 4.30 | .12 |
| Stochastic Population Growth Rate (λs) | 1, 4 | 77.73 | <.001 | 1, 4 | 37.90 | .004 | |||||||||
Bolded values indicate significance at p ≤ .05; marginal significance at p ≤ .1 is indicated by †.