Table 5. Occupancy models (Ψ) constructed for cormorants, egrets, and herons using parameters from the top ranked model for detection (p).
Number of parameters (K), AIC, ΔAIC, and models AIC weight are included. Models were constructed using data collected of species presence and absence on catfish ponds in the Mississippi Delta. N = 2,883 ponds for each species.
| Model a | K | AIC | ΔAIC | AIC Weight |
|---|---|---|---|---|
| Cormorant | ||||
| Ψ(pond + surroundings + year) p(date3 + year) | 24 | 16290.5 | 0 | 1.0 |
| Ψ(pond + year) p(date3 + year) | 18 | 16326.6 | 36.0 | 0.0 |
| Ψ(surroundings + year) p(date3 + year) | 15 | 16688.4 | 397.8 | 0.0 |
| Ψ(year) p(date3 + year) | 9 | 16723.6 | 433.1 | 0.0 |
| Ψ(.) p(.) | 2 | 19401.8 | 3111.3 | 0.0 |
| Egret | ||||
| Ψ(pond + surroundings + year) p(date2 + year) | 23 | 14321.8 | 0 | 1.0 |
| Ψ(pond + year) p(date2 + year) | 17 | 14409.9 | 88.0 | 0.0 |
| Ψ(surroundings + year) p(date2 + year) | 14 | 14510.8 | 189.0 | 0.0 |
| Ψ(year) p(date2 + year) | 8 | 14585.1 | 263.3 | 0.0 |
| Ψ(.) p(.) | 2 | 15501.4 | 1179.6 | 0.0 |
| Heron | ||||
| Ψ(pond + year) p(date3 + year) | 18 | 11048.3 | 0 | 0.88 |
| Ψ(pond + surroundings + year) p(date3 + year) | 24 | 11052.3 | 4.0 | 0.12 |
| Ψ(surroundings + year) p(date3 + year) | 15 | 11393.5 | 345.2 | 0.0 |
| Ψ(year) p(date3 + year) | 9 | 11460.6 | 412.3 | 0.0 |
| Ψ(.) p(.) | 2 | 12154.0 | 1105.7 | 0.0 |
a Variable description: Year: categorical variable of survey year, with 2015 set as the reference; Date: Ordinal data where October 01 is set to 01 of each year; pond: Group of variables related to individual catfish ponds (Table 1); Surroundings: Group of variables related to the physical surroundings of catfish ponds (Table 1)