Table 1.

Statistical evidence on tau genotype dependence of adult survival and juvenile recruitment in the combined six populations

Int. (d) and genotype	R	S	S/R	χ2 surv	P surv	fA*	Y	EY	χ2 recr	P recr
Int. 1 (157)
+/+	52	23	0.44				74	41.4
tau/+	135	61	0.45				64	73.7
tau/tau	48	8	0.17				10	32.8
All	235	92	0.39	12.81	<0.01	0.471	148		42.78	<0.0001
Int. 2 (47)
+/+	97	76	0.78				102	84.6
tau/+	125	82	0.66				70	82.3
tau/tau	18	13	0.72				15	20.0
All	240	171	0.71	4.34	>0.1	0.327	187		6.67	0.035
Int. 3 (114)
+/+	178	43	0.24				232	229.2
tau/+	152	26	0.17				178	177.4
tau/tau	28	3	0.11				31	34.3
All	358	72	0.20	4.21	>0.1	0.279	441		0.36	>0.1
Int. 4 (106)
+/+	275	16	0.058				530	453.5
tau/+	204	9	0.044				272	325.2
tau/tau	34	2	0.059				35	58.3
All	513	27	0.053	*	*	0.264	837		30.89	<0.0001
Ints. 1–3 (318)
+/+	327	142	0.43				408	328.1
tau/+	412	169	0.41				312	353.0
tau/tau	94	24	0.26				56	94.9
All	833	335	0.40	9.94	<0.01		776		40.16	<0.0001

Data are listed in the table for the three genotypes over four intervals (1–4; Fig. 1) of the study. Headings from left to right are defined as follows: interval (d) and genotype, duration of interval (int.) between trapping in days and genotype; R, mice released with tags at the beginning of the interval (including those already tagged before); S, tagged mice caught alive at the end of the interval; S/R, fraction surviving the interval; χ² survival (surv) and P surv, test of independence of survival from genotype; fA*, relative mean frequency of the tau allele in the population in the interval, calculated from the means of the frequency among R and S; Y, young, untagged mice caught at the end of the interval and assumed born in the interval; EY, expected distribution of genotypes among these young mice on the basis of the fA* and assuming Hardy–Weinberg equilibrium; χ² recruitment (recr) and P recr, test of the correspondence of the genotype in the prior (EY) and new (Y) cohort. In the bottom four rows, the data for intervals 1–3 are added and analyzed jointly. Note: In interval 4, the strongly reduced initial frequency of homozygote mice (6.6%) combined with the low winter population survival (5.3%) yielded an expected S for this genotype of only 2, too small to allow for χ² testing. For these reasons, interval 4 was not included in the overall joint analysis (for intervals 1–3) in the lower part of the table. Genotype dependence of recruitment can however be tested over all four intervals combined and yields χ² = 108.8 (P < 0.0001).