Skip to main content

Table 2 Long's test for heterogeneity of admixture rates

From: Rapid fixation of non-native alleles revealed by genome-wide SNP analysis of hybrid tiger salamanders

Pond

n

M

F LS

X2 (63 df)

X2 (60 df)

X2 (59 df)

Bluestone

41

0.591

0.041

588.4 ***

26.1

 

Melindy

55

0.095

0.486

1120.5 ***

31.1

 

Pond H

51

0.621

0.094

412.5 ***

61.4

 

Sycamore

56

0.306

0.108

1786.7 ***

23.6

 

Toro

52

0.518

0.148

1058.6 ***

414.8 ***

53.3

  1. Sample size (n), mean admixture proportion (M = introduced allele frequency across all markers), standardized variance of the introduced allele frequencies among markers within samples (F LS – analogous to F ST among subpopulations within a metapopulation [30]), and Long's test statistic for goodness-of-fit to the null hypothesis of neutral admixture (accounting for variation owing to drift). The test with 63 df includes all markers, the test with 60 df eliminated the three most introgressed markers (E06E11, E12C11, and E23C06), and the test with 59 df also eliminated mtDNA (Toro only). *** P << 0.0001