Ecological Archives A018-040-A2

Arnaud Ghilain and Marc Bélisle. 2008. Breeding success of Tree Swallows along a gradient of agricultural intensification. Ecological Applications 18:1140–1154.

Appendix B. ΔmAICc 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 B1. ΔmAICc 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

1.09

5992.84

4.25

12875.42

10.87

2

1.09

8561.16

3.87

13936.19

7.66

3

1.09

6220.17

3.25

13218.33

9.85

4

1.09

5445.27

1.00

11967.63

8.58

5

1.09

5845.30

1.46

13201.81

8.97

10

1.09

8540.39

0.00

10011.45

6.71

20

1.09

10215.90

2.19

7295.85

9.47

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


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