Table 4. Results from occupancy modeling (ψ, occupancy rate and p probability of detection) for the eight species with the type of detection used (A for Audio and V for Visual) and results from the power analysis with the estimated number of visits (K) needed to achieve a p’ (probability that the species is detected at least once during the survey) equal to 0.8, 0.9 or 0.95 and the number of sites (S) needed with 8 visits (K = 8) to detect a decline of R equal to 0.5, 0.15 or 0.30.
| Species (Detection) | Naïve occupancy | ψ (SD) | p (SD) | K (p' = 0.8) | K (p' = 0.9) | K (p' = 0.95) | S (R = 0.05) | S (R = 0.15) | S (R = 0.30) |
| A. femoralis (A) | 1.00 | 1 (0.002) | 0.30 (0.03) | 4 | 6 | 8 | 835 | 127 | 40 |
| A. granti (A) | 0.38 | 0.39 (0.14) | 0.31 (0.04) | 4 | 6 | 8 | 6721 | 746 | 183 |
| A. hahneli (A) | 0.62 | 0.62 (0.14) | 0.32 (0.05) | 4 | 6 | 8 | 14080 | 1523 | 361 |
| A. baeobatrachus (A) | 0.31 | 0.42 (0.20) | 0.07 (0.04) | – | – | – | – | – | – |
| D. tinctorius (V) | 0.46 | 0.46 (0.14) | 0.53 (0.04) | 2 | 3 | 4 | 8449 | 929 | 225 |
| R. margaritifera (V) | 1.00 | 1 (0.003) | 0.19 (0.02) | 8 | 11 | 14 | 2969 | 352 | 92 |
| A. flavescens (V) | 0.15 | 0.16 (0.11) | 0.11 (0.05) | – | – | – | – | – | – |
| R. lescurei (V) | 0.15 | 0.17 (0.11) | 0.09 (0.05) | – | – | – | – | – | – |
Naïve occupancy, i.e. the number of sites where the species was detected at least once during the survey is also indicated for each species.