Chinook Salmon above Devils Canyon on the Susitna River: a Sink or Sustaining Population? Devils Canyon (PRM )
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1 Chinook Salmon above Devils Canyon on the Susitna River: a Sink or Sustaining Population? Devils Canyon (PRM ) 1
2 Introduction Purpose of presentation: Characterize population State Hypotheses Describe a genetics-based approach to resolve the issue Why Relevant: Fish distribution and origin will be considered in the impact assessment of Watana Dam 2
3 Background Radio-tagged Chinook (795 and 1,234) migrated upstream of Devils Canyon (12 and 3) in 2012 and 2013, respectively. Some appeared to spawn there. Where does this relatively small population (~100) come from? Sustaining population (Homers): originate from above DC Sink population (Roamers): originate from below DC Provisional Data 3
4 (n=12) (n=3) Provisional Data 4
5 Chinook Salmon that Passed I-3 First Tag Number Detection Above I-3 Destination Returned Downstream of I Jul Kosina Creek Jul Devil Creek Jul Portage Creek X Jul Kosina Creek Jul Chinook Creek X Jul Kosina Creek Jul Kosina Creek Jul Kosina Creek Jul Portage Creek X Jul Portage Creek X Jul Kosina Creek Jul Portage Creek X Jul Tsusena Creek Jul Unknown X Jul Devil Creek Provisional Data 5
6 Impediment 3 PRM165 Release Site PRM 124 Spawning Area PRM 209 Provisional Data 6
7 Spawning Area Impediment 3 PRM 152 PRM 165 Release Site PRM 124 Provisional Data 7
8 Impediment 3 PRM 165 Release Site PRM 124 Spawning Area PRM??? Provisional Data 8
9 What we know Chinook salmon successfully spawn above DC Adults Juveniles Few Chinook salmon make it through all the impediments in some years Home to natal sites Spawn and die
10 Hypotheses about Chinook salmon above Devils Canyon H1: Self-sustaining population(s) H2: Strays from below-canyon populations H3: Some combination of the two
11 How to test among hypotheses? Tag the juveniles Logistically difficult Limited # of generations what happened during times when we have not been looking? Identify physical/behavioral differences Confounded with environment Common garden experiments Logistically difficult Genetic data but how?
12 First, we collect tissues from Chinook salmon
13 Chinook salmon genetic collections Provisional Data
14 Chinook salmon genetic collections Upper Cook Inlet: 4,483 adults 45 spawning locations Provisional Data
15 Chinook salmon genetic collections Provisional Data
16 Chinook salmon genetic collections Above Devils Canyon: 12 adults, 108 juveniles 3 locations Provisional Data
17 Next, we apply population genetics concepts Genetic Drift Migration
18 Population genetics concepts Genetic Drift Caused by: Restricted gene flow among populations Chance that genes pass across generations Affected by: Population size Time (generations) Results in: Loss of variation within populations Divergence among populations Migration Opposite cause, affect, results
19 Hypotheses about Chinook salmon above Devils Canyon H1: Self-sustaining population(s) Percentages divergent from below-canyon populations Missing gene types for some genes Percentages trending across time H2: All strays from below-canyon populations Percentages similar to below-canyon populations Most gene types present Percentages trending across time H3: Some combination of the two Percentages similar or divergent to below-canyon populations, depending on year Most gene types present Percentages variable across time
20 When will we report? Last field season: 2014 Report due in February, 2015
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