Table 3 Candidate set of generalised linear mixed models used to investigate the relationship between mean first-passage time (mFPTRmax) and environmental variables of Egyptian Geese and Red-billed Teal. Individual birds (ID) were added as a random effect to all models. See Table 2 and text in Methods for derivation of environmental predictor variables
Model | Model formula | ||
|---|---|---|---|
1 | Food quantity | mFPTRmax ~ NDVIt + (1|ID) | |
2 | Food quality (16 day) | mFPTRmax ~ ΔNDVI t-16 + (1|ID) | |
3 | Food quality (32 day) | mFPTRmax ~ ΔNDVI t-32 + (1|ID) | |
4 | Wetland cover | mFPTRmax ~ mNDWIt + (1|ID) | |
5 | Wetland cover change (16 day) | mFPTRmax ~ ΔmNDWIt-16 + (1|ID) | |
6 | Wetland cover change (32 day) | mFPTRmax ~ ΔmNDWI t-32 + (1|ID) | |
7 | Precipitation | mFPTRmax ~ Precipt + (1|ID) | |
8 | Precipitation (16 day) | mFPTRmax ~ ΔPrecipt-16 + (1|ID) | |
9 | Precipitation (32 day) | mFPTRmax ~ ΔPrecipt-32 + (1|ID) | |
10 | Site | mFPTRmax ~ site + (1|ID) | |
11 | Temperature & elevation | mFPTRmax ~ Temp + Elev + (1|ID) | |
RM hypothesis:a | |||
12 (16) | Food quantity, wetland cover & precipitation (+ temperature & elevation, site) | mFPTRmax ~ NDVIt + mNDWIt + Precipt + (1|ID) | |
13 (17) | Food quantity & wetland cover (+ temperature & elevation, site) | mFPTRmax ~ NDVIt + mNDWIt + (1|ID) | |
14 (18) | Food quantity & precipitation (+ temperature & elevation, site) | mFPTRmax ~ NDVIt + Precipt + (1|ID) | |
15 (19) | Wetland cover & precipitation (+ temperature & elevation, site) | mFPTRmax ~ mNDWIt + Precipt + (1|ID) | |
PM hypothesis:b | |||
20 (24) | 16 day Lag | Change in food quality, wetland cover & precipitation (+ site) | mFPTRmax ~ ΔNDVI t-16 + ΔmNDWI t-16 + ΔPrecipt-16 + (1|ID) |
21 (25) | Change in food quality & wetland cover (+ site) | mFPTRmax ~ ΔNDVI t-16 + ΔmNDWI t-16 + (1|ID) | |
22 (26) | Change in food quality & precipitation (+ site) | mFPTRmax ~ ΔNDVI t-16 + ΔPrecipt-16 + (1|ID) | |
23 (27) | Change in wetland cover change & precipitation (+ site) | mFPTRmax ~ ΔmNDWI t-16 + ΔPrecipt-16 + (1|ID) | |
28 (32) | 32 day Lag | Change in food quality, wetland cover & precipitation (+ site) | mFPTRmax ~ ΔNDVI t-32 + ΔmNDWI t-32 + ΔPrecipt-32 + (1|ID) |
29 (33) | Change in food quality & wetland cover (+ site) | mFPTRmax ~ ΔNDVI t-32 + ΔmNDWI t-32 + (1|ID) | |
30 (34) | Change in food quality & precipitation (+ site) | mFPTRmax ~ ΔNDVI t-32 + ΔPrecipt-32 + (1|ID) | |
31 (35) | Change in wetland cover change & precipitation (+ site) | mFPTRmax ~ ΔmNDWI t-32 + ΔPrecipt-32 + (1|ID) | |
36 | Null | mFPTRmax ~ 1 + (1|ID) | |