Table 2. Simpson’s diversity values (1/D) for historic and modern survey eras.
95% confidence intervals are provided in parentheses.
| Site | 1952 | 2013 (all detections) | 2013 (visual only) |
|---|---|---|---|
| Overall | 9.28 (8.66–9.93) | 30.90 (29.62–31.91)a | 23.47 (22.04–24.58)a |
| Coniferous | 15.93 (13.51–17.33) | 13.95 (12.64–14.93) | 7.15 (6.01–8.10)a |
| Marsh | 3.14 (2.97–3.33) | 10.89 (10.14–11.66) a | 9.63 (8.84–10.42)a |
| Mixed deciduous | 12.24 (10.51–13.66) | 12.92 (11.44–14.26) | 11.11 (9.45–12.5) |
| Oak | 11.12 (9.63–12.21) | 12.19 (10.67–13.7) | 7.55 (6.54–8.6)a |
| Willamette | 12.69 (11.34–13.41) | 12.08 (10.93–13.14) | 10.73 (9.15–12.06) |
Notes.
a
Indicates significantly different modern diversity compared to historic values (Paired t-test, p < 0.05).