Appendix A. Akaike weights of the models explaining nestbox occupancy by Tree Swallows at seven spatial scales along a gradient of agricultural intensification in southern Québec, 2005–2006.
TABLE A1. Akaike weights of the models explaining nestbox occupancy by Tree Swallows at seven spatial scales along a gradient of agricultural intensification in southern Québec, 2005–2006. Models are generalized mixed model with logit link and a binomial error distribution with farm ID as random factor (n = 800). See Table 1 for variable definition and justification.
Scale (km) |
Nestbox |
Intensive |
Nestbox + Intensive |
Extensive |
Nestbox + Extensive |
1 |
0.824 |
0.000 |
0.170 |
0.000 |
0.006 |
2 |
0.777 |
0.000 |
0.194 |
0.000 |
0.029 |
3 |
0.740 |
0.000 |
0.251 |
0.000 |
0.009 |
4 |
0.484 |
0.000 |
0.505 |
0.000 |
0.011 |
5 |
0.541 |
0.000 |
0.449 |
0.000 |
0.011 |
10 |
0.359 |
0.000 |
0.619 |
0.000 |
0.022 |
20 |
0.628 |
0.000 |
0.362 |
0.000 |
0.010 |
Notes: mAICc weights depict the relative strength of each model for a given spatial scale (i.e., radius).
List of models and their variables:
Nestbox = year + competition + clearance + previous year occupancy × previous year fledging success
Intensive = year + water + intensive culture + manure tanks + intensive culture × manure tanks
Nestbox + Intensive = year + competition + clearance + previous year occupancy × previous year fledging success + water + intensive culture + manure tanks + intensive culture× manure tanks
Extensive = year + water + extensive culture + manure tanks + extensive culture × manure tanks + cattle + extensive culture × cattle
Nestbox + Extensive = year + competition + clearance + previous year occupancy × previous year fledging success + water + extensive culture + manure tanks + extensive culture × manure tanks + cattle + extensive culture × cattle