|
|
|
Hall, M., R. P. Morgan II, and R. G. Danzmann. 2002. Mitochondrial DNA analyses of mid-Atlantic USA populations of brook trout (Salvelinus fontinalis): the zone of contact for major historical lineages. Transactions of the American Fisheries Society 131:1140-1151. In a Nutshell: Problem - The hypotheses that the mid-Atlantic range of brook trout, Salvelinus fontinalis, is transitional in phylogenetic assemblage structure and that this assemblage structure supports evidence for historic, formative geomorphological events in this region were tested for this species. What - Mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs) were examined in brook trout collected from Maryland. Population genetic structure and intraspecific divergence were determined and compared with results from previous work throughout the mid-Atlantic range of brook trout. A total of 29 mtDNA haplotypes were analyzed including 15 previously undetected in brook trout. Findings - Phylogenetic analysis revealed three major assemblages in Maryland, two east and one west of the Ohio River/Chesapeake Bay drainage divide. Analysis of molecular variance (AMOVA) results indicated that drainage basins within the two major drainages (Ohio River and Chesapeake Bay) were major units of population division. Potential Applications -
These results suggest that brook trout populations in the mid-Atlantic should be managed as major assemblage groups based on mtDNA descent. This information is being used by MDNR in development of their brook trout management plan. |
|
