Table 2.

A priori models for temperature variation (Models 1–12) and mean temperature (Models 13–24) stratified by brown-headed cowbird (CB; Models 1–6 and 13–18) and house sparrow eggs (HS; Models 7–12 and 19–24). The number of parameters (K), sample size (N Obs), natural log likelihood (LNL), Akaike information criteria adjusted for small sample size (AICc), change in AICc from the smallest AICc value (∆ AICc), Akaike weight (wi), VIF, and model significance (Sig) are displayed for each model. The variables species, width, and shape relate to brown-headed cowbird versus house sparrow eggs, width of the eggs (millimeters), and egg shape, respectively

	K	N	LNL	AICc	∆AICc	wi	VIF	Sig
1 Null	3	26	70.839	77.361	5.947	0.037	NA	NA
2 Width	4	26	67.777	76.868	5.453	0.048	1.087	0.118
3 Shape	4	26	69.385	78.476	7.061	0.021	1.000	0.334
4 Volume	4	26	70.574	79.665	8.251	0.012	1.032	0.671
5 Width + Shape	5	26	59.510	71.414	0.000	0.727	1.629	0.004
6 Width + Shape + Volume	6	26	59.510	74.510	3.095	0.155	1,012.400	0.015
7 Null	3	15	61.609	68.609	0.000	0.516	NA	NA
8 Width	4	15	61.330	71.512	2.903	0.121	1.023	0.719
9 Shape	4	15	60.458	70.639	2.031	0.187	1.115	0.439
10 Volume	4	15	61.190	71.372	2.763	0.130	1.111	0.654
11 Width + Shape	5	15	59.643	73.643	5.034	0.042	1.201	0.601
12 Width + Shape + Volume	6	15	59.168	77.834	9.226	0.005	1,994.735	0.750
13 Null	3	26	125.036	131.558	0.000	0.401	NA	NA
14 Width	4	26	125.008	134.098	2.541	0.113	1.087	0.874
15 Shape	4	26	123.772	132.863	1.305	0.209	1.000	0.284
16 Volume	4	26	124.805	133.896	2.338	0.125	1.032	0.650
17 Width + Shape	5	26	122.719	134.624	3.066	0.087	1.629	0.359
18 Width + Shape + Volume	6	26	120.179	135.179	3.621	0.066	1,012.400	0.230
19 Null	3	15	72.552	79.552	0.000	0.576	NA	NA
20 Width	4	15	72.386	82.568	3.016	0.128	1.023	0.715
21 Shape	4	15	72.145	82.327	2.775	0.144	1.115	0.566
22 Volume	4	15	72.451	82.633	3.081	0.123	1.111	0.776
23 Width + Shape	5	15	71.773	85.773	6.222	0.026	1.201	0.746
24 Width + Shape + Volume	6	15	71.436	90.103	10.551	0.003	1,994.735	0.856