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This Scottish Marine and Freshwater Science report describes the application of a genetic tool to estimate the early running component of juvenile Atlantic salmon. The proportions were mapped to visualise within and between-river patterns. These maps can be used to inform and help river managers achieve their conservation aims.
Of the 6,183 juveniles sampled and screened, 209 (3.4%) failed QC, resulting in a final dataset of 5,974 juveniles. Figures 2 – 10 show, per river, the proportion of early and later running components for each site, based on the cut off value.
Figure 2. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Ness (1:250,000). Pie charts are sized according to the number of individuals screened per site.
Figure 3. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Findhorn (1:300,000). Pie charts are sized according to the number of individuals screened per site.
Figure 4. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Spey (1:400,000). Pie charts are sized according to the number of individuals screened per site.
Figure 5. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Dee (1:300,000). Pie charts are sized according to the number of individuals screened per site.
Figure 6. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river North Esk (1: 125,000). Pie charts are sized according to the number of individuals screened per site.
Figure 7. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river South Esk (1:150,000). Pie charts are sized according to the number of individuals screened per site.
Figure 8. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Tay (1:400,000). Pie charts are sized according to the number of individuals screened per site.
Figure 9. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Tweed (1:325,000). Pie charts are sized according to the number of individuals screened per site.
Figure 10. Pie charts showing early (filled portion) and later (dashed portion) run timing proportions for sites from the river Ullapool (1:70,000). Pie charts are sized according to the number of individuals screened per site.
