Atlantic salmon populations invaded by farmed escapees: quantifying genetic introgression with a Bayesian approach and SNPs

Table 4 Relationships between the frequency of farmed escaped salmon in the spawning population, and observed changes in various genetic parameters

Statistic	Un-weighted mean	Weighted mean
Pair-wise F_ST 72	0.19 (0.052)	0.52 (0.0003)
Pair-wise F_ST 47d	0.17 (0.067)	0.44 (0.0014)
Pair-wise F_ST 25r	0.06 (0.30)	0.41 (0.0022)
F_ST to farm 72	0.13 (0.11)	0.22 (0.039)
F_ST to farm 47d	0.25 (0.024)	0.37 (0.0045)
F_ST to farm 25r	<0.01 (0.72)	<0.01 (0.99)
ABC introgression	0.16 (0.08)	0.47 (0.0007)
Fixed migration rate introgression	0.25 (0.025	0.36 (0.005)

Values computed are R² (P-value). Number behind statistics refers to number of SNP loci used, introgession computations only compared for 47d.
Pair-wise F_ST = observed value between historical and contemporary sample for each river; F_ST to farm = absolute difference in pair-wise F_ST between the populations historical sample and the farm sample, and between the populations contemporary sample and the farm sample, ABC introgression = estimated introgression of farmed salmon (Table 3) using ABC method, Fixed migration rate introgression = estimated introgression of farmed salmon (Table 3) using the fixed migration rate method. Un-weighted mean = mean% of farmed salmon observed on the spawning grounds for these rivers in the period 1989–2009 [5, 52], weighted mean = weighted average percentage of farmed salmon in the population combining data from both sports-fishing and spawning population samples [53].

ISSN: 2730-6844