Authors
Shawn R. Narum,
William D. Arnsberg,
Andre J. Talbot,
Madison S. Powell
Report Reference
#Conservation
Genetics
(2007) 8:1123-1132
Publication Date
13 Jan
2007
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Reproductive
Isolation Following Reintroduction of Chinook Salmon with Alternative
Life Histories
Abstract |
| We evaluated
reproductive isolation of Chinook salmon (Oncorhynchus tschawytscha)
life history types that have been reintroduced to northern Idaho,
USA. Analysis of 1003 samples at six microsatellite loci revealed
strong reprodusctive isolation between ocean- and stream-type Chinook
salmon (fall and summer spawn timing, respectively) within the Clearwater
River sub-basin (Fst=0.148, P=0.00001).
Very little evidence for gene flow among the two life history types
was observed as assignment tests correctly assigned 99.6% of individuals
in reference collections to either ocean- and stream-type Chinook
salmon. Assignment of naturally reared juveniles indicated that both
life history types were present with 24.1% stream-type and 75.9% ocean-type.
Previous studies suggest high levels of divergence among the two life
history types in natural populations, and our study verifies the persistence
of reproductive isolation among types following colonization of habitat
by (re)introduced species is likely influenced by diversity in life
history types and this strategy has lead to naturally spawning populations
in a variety of available habitats in the Clearwater River. As many
populations of O. tschawytscha are listed as threatened or
endangered under the U.S. Endangered Species Act, hope for recovery
lies not only in effective management and habitat improvement, but
adaptability of this species |
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