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Coasters in Coasters in the newsthe news
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Distribution of coaster brook troutDistribution of coaster brook trout
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Distribution of coaster brook troutDistribution of coaster brook trout
Lake Superior
Canada
United States
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What Are Coaster Brook Trout?What Are Coaster Brook Trout?
Life history variant?Life history variant?
• part of natal river part of natal river populationpopulation
• straying between riversstraying between rivers
• long range movement long range movement between populationsbetween populations
Unique stock?Unique stock?
• Evolutionary Significant Evolutionary Significant UnitUnit
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MethodsMethods
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Resolving the genetic identify Resolving the genetic identify of coastersof coasters
• microsatellite DNAmicrosatellite DNA
• high resolution high resolution
• identify individuals identify individuals and populationsand populations
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Single populations?Single populations?
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JP
CY
LC
SWDB
PL
H
C
0.01
Genetic distances Genetic distances among sampled among sampled
populationspopulations
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Cypress R.Cypress R.
Jackpine R.Jackpine R.
Pearl R.Pearl R.
Little Cypress R.Little Cypress R.
Dublin Cr.Dublin Cr.
Relatedness of Individual River Relatedness of Individual River Resident Brook TroutResident Brook Trout
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coastercoaster
hatcheryhatchery
Relatedness of Individual Brook Relatedness of Individual Brook TroutTrout
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0
5
10
15
20
25
5 6 7 8 9 10 11 12 13 14
(-) log likelihood of individual genotypes
Nu
mb
er
of
Ind
ivid
ua
ls
river brook trout
coasters
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ResultsResults
• coaster brook trout coaster brook trout genetically distinct straingenetically distinct strain
• coasters produced by river coasters produced by river populations (life history populations (life history variant) variant)
• vectors of gene flow vectors of gene flow between riversbetween rivers
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Unanswered QuestionsUnanswered Questions
• how do we bring them back?how do we bring them back?
•what makes a coaster? what makes a coaster? (habitat / life history)(habitat / life history)
• optimal vs. potential habitat optimal vs. potential habitat
• competition with exotics?competition with exotics?
• genetic structure of coasters genetic structure of coasters throughout Lake Superiorthroughout Lake Superior
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ImplicationsImplications
• coasters come from river coasters come from river populationspopulations
• interdependence of lake interdependence of lake and river populationsand river populations
• making a “coaster brood making a “coaster brood stock” won’t guarantee stock” won’t guarantee successsuccess
• management of source management of source rivers is necessary for rivers is necessary for recoveryrecovery