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Assessment of Salmon Stocks in Scotland: Integrating Genetics - Mark Coulson, Rivers & Lochs Institute

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Assessment of Salmon Stocks in Scotland: Integrating Genetics - Mark Coulson, Rivers & Lochs Institute

  1. 1. Assessment of Salmon Stocks in Scotland: Integrating Genetics (AS3IG) Mark Coulson Rivers and Lochs Institute UHI Inverness College
  2. 2. Rivers and Lochs Institute Students Matt Curran Part-time PhD Evan Roderick M by Res Dara Vaughn Full-time PhD Supporting the sustainable management of Scotland’s freshwater biodiversity Biodiversity Management Applied Genomics BioMAG Laboratory
  3. 3. Current Demographic Assessment Metrics Retain Main river counters Angling records + Mark-recapture Catch Release Tributary counters Redd Counts Juvenile surveys Smolt Counters Number, size, timing, age Number, size, timing, age Number, size, timing, age Logistic and Analytical Challenges in using this information to achieve conservation/exploitation objectives
  4. 4. Retain Main river counters Angling records + Mark-recapture Catch Release Tributary counters Redd Counts Juvenile surveys Smolt Counters Number, size, timing, age Number, size, timing, age Number, size, timing, age Numbers of breeders genetic diversity population membership phenotype (e.g. run timing) Current Demographic Assessment Metrics + Genetics
  5. 5. Optimisation of genotyping and data processing UHI-SME Collaboration Fisheries Management Delivery of stock assessment framework Delivery of genetic analysis service AS3IG Project (Assessment of Salmon Stocks in Scotland: Integrating Genetics) Funding SSE UHI/IC Ness DSFB Spey Foundation Dara Evan
  6. 6. River Carron 2012 juvenile sample Identified 10 groups as most likely Individuals sorted by group membership stocked? wild? stocked/wild? wild? stocked?
  7. 7. Group % related Nb # full-sib families 1 100 7 (1 + 6) 6 2 100 6 (1 + 5) 5 3 3 92 (45 + 47) 69 4 6 57 (27 + 30) 42 5 47 5 (2 + 3) 3 6 14 18 (8 + 10) 10 7 3 95 (45 + 40) 68 8 18 14 (6 + 8) 13 9 77 10 (7 + 3) 8 10 100 4 (1 + 3) 3 stocked? wild? stocked/wild? wild? stocked? River Carron - estimating number of breeders
  8. 8. Sample of juveniles 4 4 Resolving family relationships
  9. 9. Sample of juveniles (n = 10) 4 4 Resolving family relationships No. breeders = 8 Max. No. breeders = 20 Nb/Max. Nb = 8/20 = 0.4 BUT
  10. 10. Site Sample size No. Breeders Max. Breed Ratio Whiteadder 50 68 100 0.68 Till - Twizel Mill 32 44 64 0.69 Till - Lilburn 50 65 100 0.65 Teviot Ale Water 31 51 62 0.82 Middle Tweed Gledswood 50 77 100 0.77 Ettrick lowest 51 74 102 0.73 Ettrick - middle 50 64 100 0.64 Ettrick – middle 32 45 64 0.70 Ettrick Rankle Burn 65 77 130 0.59 Ettrick- upper 46 51 92 0.55 Yarrow lower 48 61 96 0.64 Yarrow Douglas Burn 32 50 64 0.78 Yarrow upper 50 59 100 0.59 Upper Tweed Elibank 32 54 64 0.84 Manor Water3 43 59 86 0.69 Upper Tweed – Drumelzier 50 69 100 0.69 Upper Tweed – Fruid 32 45 64 0.70 River Tweed (FASMOP report)
  11. 11. • Barriers? • Fry/parr electrofishing surveys • Stream order/elevation/distance upstream. . . Courtesy: James Hunt
  12. 12. Nb/N ratio Unequal Sex ratio Variance in Reproductive success Fluctuating Population size - - - Photo from: Moore & Fraser (2013) Annual total adult run size (N) Annual number large (>63 cm) adults Nb estimate (lower 95% CL) + precocious parr
  13. 13. Genetic Assessment Sampling Challenges Sampling requirements for specific of river stock conditioned by e.g. • population structuring • number of populations • spatial distribution of populations • need for population specific or overall river stock information • costs of genetic typing of individual loci • confidence limits needed around Nb Sampling requirements for genome conditioned by e.g. • variability of loci i.e. number of alleles • linkage relationships among loci i.e. unlinked is best • confidence limits needed around Nb • costs of genetic typing of individual loci 10 km Sampling requirements for short simple systems (e.g. Evelix) will be different than for long branching systems (e.g. Oykel-Casseley) and in turn than for long systems with lochs (e.g. Shin system)
  14. 14. Optimisation of genotyping and data processing UHI-SME Collaboration Fisheries Management Delivery of stock assessment framework Delivery of genetic analysis service AS3IG Project (Assessment of Salmon Stocks in Scotland: Integrating Genetics) casestudies
  15. 15. Retain Main river counters Angling records + Mark-recapture Catch Release Tributary counters Redd Counts Juvenile surveys Smolt Counters Number, size, timing, age Number, size, timing, age Number, size, timing, age Numbers of breeders genetic diversity population membership phenotype (e.g. run timing) Current Demographic Assessment Metrics + Genetics

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