Table 2.
Model comparison of human disturbance, land cover, and landform hypotheses to explain snowy plover site occupancy during pre-breeding (ψ), site colonization between pre-breeding and nesting (γ1), site extinction between pre-breeding and nesting (ε1), site colonization between nesting and brood-rearing (γ2), site extinction between nesting and brood-rearing (ε2), and detection (p) on Florida Panhandle beaches in 2009 and 2010. ΔAICc is the difference in AICc score from the top model, w is the model weight, and K is the number of parameters included within the model. Superscripts represent stage-specific human disturbance estimates, PB: pre-breeding, N: Nesting, BR: brood-rearing. For variable names, see Table 1
| Hypotheses | Model | Δ AICc | w | K |
|---|---|---|---|---|
| Disturbance + Land Cover + Landform | ψ(HumansPB + Veg + D_ht + D_slp + D_len), γ1 (HumansN + Veg + Debris + Elevation + D_slp), ε1(HumansN + Bay), γ2(HumansBR + Veg), ε2(HumansBR + Bay), p(Year) | 0 | 0.9997 | 22 |
| Disturbance + Landform | ψ(HumansPB + D_ht + D_slp + D_len), γ1 (HumansN + Elevation + D_slp), ε1(HumansN + Bay), γ2(HumansBR), ε2(HumansBR + Bay), p (Year) | 16.55 | 0.0003 | 18 |
| Disturbance + Land Cover | ψ(HumansPB + Veg), γ1 (HumansN + Veg + Debris), ε1(HumansN), γ2(HumansBR + Veg), ε2(HumansBR), p (Year) | 18.89 | 0.0001 | 16 |
| Disturbance | ψ(HumansPB), γ1 (HumansN), ε1(HumansN), γ2(HumansBR), ε2(HumansBR), p (Year) | 38.69 | 0 | 12 |
| Land Cover + Landform | ψ(Veg + D_ht + D_slp + D_len), γ1 (Veg + Debris + Elevation + D_slp), ε1(Bay), γ2(Veg), ε2(Bay), p (Year) | 39.63 | 0 | 17 |
| Land Cover | ψ(Veg), γ1(Veg + Debris), ε1, γ2(Veg), ε2(.), p (Year) | 62.50 | 0 | 13 |
| Landform | ψ(D_ht + D_slp +D_len), γ1(Elevation + D_slp), ε1(Bay), γ2(.), ε2(Bay), p (Year) | 77.88 | 0 | 11 |
| Intercept-only | ψ(.), γ1(.), ε1(.), γ2(.), ε2(.),p (.) | 106.76 | 0 | 4 |
Lowest AICc = 2205.47.