Genetic Differentiation among Danish Brown Trout (Salmo trutta) Populations

Abstract

M~L E RHANSEN, hi., LOESCHCKE, V., RASMUSSEN, G. and SIMONSEN, V. 1993 Brown trout (Salmo trutta L.) from twelve locations in small rivers in Jutland, Denmark, were examined by allozyme electrophoresis. Seven of the locations are tributaries to the small (3.3 km2) Lake Hald. These and two other locations are assumed to have been mainly inaccessible to gene flow from outside for hundreds of years because of impassable dams. The levels of polymorphism indicated that little or no loss of genetic variation had occurred in these isolated populations compared to populations open to gene flow. In Lake Hald significant genetic differentiation among the tributary populations was detected. Intensive stocking with trout from a hatchery strain directly into the lake was shown to have had little or no effect on the genetic composition of the original populations. In contrast, transplantation of trout from one tributary to another within the lake system was successful. The geographical distribution of genetic variation indicated that the Lake Hald populations are genetically divergent from the other populations and for that reason special care concerning management practices in the lake is recommended.

Local adaptation in brown trout early life-history traits: implications for climate change adaptability

“…KAR and HAL have previously been stocked with exogenous trout, but two studies have shown that this has had virtually no effect on the indigenous gene pools (Hansen et al 1993;Hansen 2002). LIL has been subject to some stocking in the 1980s and the early 1990s with trout of same origin as those stocked in KAR, but as natural reproduction in the river has always been high, we assume that this has had limited effect on the indigenous gene pool.…”

Alleles of sAAT‐1,2* isoloci in brown trout: potential diagnostic marker for tracking routes of post‐glacial colonization in northern Europe

“…1). A allele variant identical to the sAAT-1,2*116 allele (Ferguson, 1989) was found in populations from the western part of the Baltic Sea drainage: in Sweden (Allendorf et al, 1976;Jorde, 1994;Jansson et al, 1995;Jansson, 1996), Denmark (Krieg & Guyomard, 1985;Hansen et al, 1993;Largiader & Scholl, 1995), and Poland (Krieg & Guyomard, 1985;Luczynski et al, 2000). The allele is widely distributed along the Atlantic coast (Ferguson, 1989).…”

Relationship Among Hydrotaea Species Based on Allozymes, Karyotype and Morphology (Diptera: Muscidae)

“…Electrophoresis was conducted by standard procedures using horizontal starch gel electrophoresis (see, e.g., FERGUSON 1980;HANSEN et al 1993 Sod). Mpi) was analysed in only a few flies of each species and thus not used in the procedures for estimating phylogenetic trees; however, it is mentioned in the discussion of diagnostic loci.…”