Genetics Investigations of Dolly Varden Char (Salvelinus malma) of the North Slope of Alaska. Part I: Population Genetic Structure of Dolly Varden Char from Beaufort Sea Drainages of Northern Alaska and Canada. Part II: Stock Origins of Dolly Varden Collected from Beaufort Sea Coastal sites of Arctic Alaska and Canada. Alaska Fisheries Technical Report Number 43, March 1998

摘要

This study investigated the genetic relationships arnong closely adjacent populations of Dolly Varden charr, Salvelinus malma, to infer recent evolutionary events on the Yukon north slope. Specifically, microphylogeographic patterns were ascertained, relationships among different life history types of cham were determined, and the potential role of dispersal and philopatry on past and present gene flow was assessed. The possibility of employing genetic markers for stock discrimination and for conservation were also examined. Microsatellite and mitochondrial D-Ioop data on eight populations of S. malma were concordant, revealing that gene flow was restricted between drainages but cornmon among sites within drainages. Two phylogroups were observed in the Firth drainage, but the other three drainages were dominated by a single phylogroup. Furthermore, the Fiah drainage contained the highest genetic diversity, while the other drainages possessed a subset of the variation found in it. These results suggest that recolonization of the Yukon north slope likely came from Alaskan populations and that the Firth drainage should receive priority for conservation.