Ecological Archives E093-108-A5

Daniel L. Preston, Jeremy S. Henderson, and Pieter T. J. Johnson. 2012. Community ecology of invasions: direct and indirect effects of multiple invasive species on aquatic communities. Ecology 93:1254–1261.

Appendix E (Table E1). Occupancy models with the most support (ΔQAIC < 2) out of 64 candidate models for four native amphibian species. Each model represents variations of a global model for occupancy probability (ψ[EL, SA, VE, TR, FI, BU]) with a general equation for detection probability (p[EL, SA, VE, TR, FI, BU, SM, TE, DA, TU]). The table shows the change in quasi-AIC value from the top model (ΔQAIC), Aikake's weight (w), the number of parameters (K), and twice the negative log-likelihood (-2Log(L)). EL = elevation; SA = pond surface area; VE = percent of the shoreline vegetated; TR = number of trees within 15 m of the pond; FI = presence of nonnative fish (centrarchids and mosquitofish); BU = presence of bullfrogs; SM = survey method; TE = water temperature; DA = survey date; TU = water turbidity.

Model ΔQAIC w K -2Log(L)
Pacific Treefrog
ψ(FI) 0.00 0.34 14 227.54
ψ(EL, FI) 0.55 0.26 15 222.65
ψ(FI, BU) 1.83 0.14 15 226.97
ψ(SA, FI) 1.95 0.13 15 227.38
ψ(VE, FI) 1.99 0.13 15 227.50
Western Toad
ψ(EL, SA, VE, BU) 0.00 0.40 17 222.78
ψ(SA, VE, BU) 0.93 0.25 16 226.62
ψ(EL, SA, VE, FI, BU) 1.48 0.19 18 222.10
ψ(EL, SA, VE, TR, BU) 1.99 0.15 18 222.77
California Newt
ψ(BU) 0.00 0.14 14 346.29
ψ(.) 0.04 0.14 13 353.25
ψ(SA) 0.04 0.14 14 346.43
ψ(SA, BU) 0.70 0.10 15 341.83
ψ(FI, BU) 1.36 0.07 15 344.10
ψ(VE, BU) 1.52 0.07 15 344.66
ψ(VE) 1.55 0.06 14 351.58
ψ(SA, VE) 1.66 0.06 15 345.13
ψ(TR) 1.68 0.06 14 352.03
ψ(TR, BU) 1.78 0.06 15 345.53
ψ(EL, BU) 1.94 0.05 15 346.08
ψ(SA, TR) 1.94 0.05 15 346.10
California Red-legged Frog
ψ(SA) 0.00 0.34 14 268.08
ψ(SA, FI) 1.71 0.14 15 267.78
ψ(SA, BU) 1.78 0.14 15 267.85
ψ(SA, VE) 1.84 0.13 15 267.91
ψ(EL, SA) 1.98 0.12 15 268.06
ψ(SA, TR) 1.98 0.12 15 268.06

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