Table 2
Comparison of detection probability (p) and occupancy (ψ) estimates for 12 freshwater mussel species across four different levels of sampling effort. Estimates were calculated using a constant probability, single-season occupancy model (PRESENCE 9.7 software). For detection probability, 95% confidence intervals are provided in parentheses.
| Species | 1.5 h | 3 h | 4.5 h | 4.5 h plus shells | ||||
|---|---|---|---|---|---|---|---|---|
| p | ψ | p | ψ | p | ψ | p | ψ | |
| Alasmidonta marginata | 0.38 (0.12, 0.75) | 0.28 | 0.77 (0.51, 0.91) | 0.32 | 0.77 (0.51, 0.91) | 0.32 | 0.89 (0.76, 0.95) | 0.79 |
| Alasmidonta undulata | 0.09 (0.05, 0.14) | * | 0.63 (0.34, 0.85) | 0.10 | 0.57 (0.32, 0.79) | 0.14 | 0.74 (0.60, 0.84) | 0.38 |
| Anodontoides ferussacianus | 0.78 (0.63, 0.87) | 0.40 | 0.80 (0.68, 0.89) | 0.49 | 0.84 (0.73, 0.91) | 0.54 | 0.80 (0.70, 0.88) | 0.67 |
| Elliptio complanata | 0.90 (0.83, 0.95) | 0.69 | 0.87 (0.80, 0.92) | 0.80 | 0.85 (0.78, 0.90) | 0.88 | 0.92 (0.87, 0.96) | 0.89 |
| Lampsilis cardium | 0.59 (0.38, 0.77) | 0.20 | 0.86 (0.70, 0.94) | 0.22 | 0.82 (0.68, 0.90) | 0.32 | 0.80 (0.68, 0.88) | 0.45 |
| Lampsilis siliquoidea | 0.70 (0.56, 0.81) | 0.36 | 0.77 (0.64, 0.86) | 0.39 | 0.82 (0.72, 0.89) | 0.49 | 0.77 (0.68, 0.84) | 0.84 |
| Lasmigona compressa | 0.69 (0.53, 0.81) | 0.46 | 0.81 (0.68, 0.90) | 0.50 | 0.83 (0.72, 0.91) | 0.57 | 0.82 (0.71, 0.89) | 0.75 |
| Lasmigona costata | 0.65 (0.53, 0.76) | 0.51 | 0.69 (0.59, 0.78) | 0.66 | 0.79 (0.70, 0.86) | 0.69 | 0.82 (0.74, 0.88) | 0.76 |
| Ligumia recta | 0.64 (0.40, 0.82) | 0.15 | 0.67 (0.49, 0.81) | 0.25 | 0.69 (0.53, 0.82) | 0.27 | 0.76 (0.62, 0.85) | 0.38 |
| Pyganodon grandis | 0.69 (0.46, 0.85) | 0.15 | 0.67 (0.49, 0.81) | 0.25 | 0.80 (0.65, 0.90) | 0.26 | 0.81 (0.66, 0.90) | 0.30 |
| Strophitus undulatus | 0.82 (0.69, 0.90) | 0.35 | 0.84 (0.74, 0.91) | 0.44 | 0.92 (0.82, 0.96) | 0.44 | 0.80 (0.71, 0.87) | 0.65 |
| Villosa iris | 0.78 (0.65, 0.87) | 0.35 | 0.78 (0.67, 0.87) | 0.44 | 0.88 (0.78, 0.94) | 0.45 | 0.93 (0.85, 0.97) | 0.52 |
| Mean | 0.69 | 0.35 | 0.78 | 0.43 | 0.82 | 0.47 | 0.83 | 0.64 |
*: data insufficient to model occupancy.
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