Table 2.

Stepwise linear regression analyses for the assessment of prey variables and climate variables associated with F. tularensis antibody presence in arctic foxes at Karrak Lake, Nunavut.

Model	Variables *	B	SE	β	t	p	95.0% Confidence Interval for B
							Lower    Upper
1 a	Constant YP RBV YP Goose YP Lemming	0.377 0.209 −7.43 × 10−5 −0.037	0.133 0.053 0 0.013	0.265 −0.199 −0.184	2.839 3.916 −2.932 −2.832	0.005 <0.001 0.004 0.005	0.115    0.639 0.104    0.315 0     0 −0.063    −0.011
2 a	Constant Snow Cover May Total Precip Ac YP Temp May	−0.162 0.004 0.007 0.111	0.237 0.002 0.001 0.028	0.17 0.409 0.372	−0.687 2.16 5.057 3.934	0.493 0.032 0 <0.001	−0.629    0.304  0     0.008 0.004    0.01 0.055    0.167
3 b	Constant YP RBV YP Lemming	0.021 0.292 −0.289	0.068 0.068 0.1	0.408 −0.272	0.31 4.312 −2.878	0.757 <0.001 0.005	−0.113    0.155 0.158     0.427 −0.488    −0.089
4 b	Constant Temp May	−1.046 −0.187	0.307 0.047	−0.39	−3.409 −3.949	<0.001 <0.001	−1.655    −0.436 −0.282    −0.093
Model	R	R2	Adj R2	SEE	R2 Change	F Change	Sig. F Change
1 a	0.408	0.166	0.154	0.345	0.034	8.02	0.005
2 a	0.428	0.184	0.171	0.341	0.064	15.48	<0.001
3 b	0.482	0.232	0.214	0.325	0.074	8.29	0.005
4 b	0.39	0.152	0.142	0.339	0.152	15.59	<0.001

^a Model 1 and 2 = dependent variable is the presence or absence of F. tularensis antibodies in live-captured adult (>1 year) and juvenile (6–9 weeks) arctic foxes. ^b Model 3 and 4 = dependent variable is the presence or absence of F. tularensis antibodies in live-captured juvenile (6–9 weeks) arctic foxes. * YP RBV = year-prior northern red-backed vole abundance (vole captures per 100 trap nights); YP Goose = year-prior goose abundance per square kilometer; YP Lemming = year-prior lemming abundance (collared and brown lemming captures per 100 trap nights); Snow Cover May = average snow cover in May (cm) during the year of sampling; Total Precip Ac = total precipitation from May to August (mm) during the year of sampling; YP Temp May = year-prior average temperature for the month of May (°C); Temp May = average temperature for the month of May (°C) during the year of sampling.