GENETIC-RELATIONSHIPS AMONG POPULATIONS OF WILD RESIDENT, AND WILD AND HATCHERY ANADROMOUS BROOK CHARR

To determine the genetic relationship of anadromous and resident life- history types within and among drainages, and compare several hatchery strains to their progenitor populations, brook charr Salvelinus fonti nalis were examined for allozyme and mitochondrial DNA variation. Grea ter genetic similarity of sympatric anadromous and resident charr was found compared to similar life-history forms allopatrically, suggestin g the two life-history types are not reproductively isolated. Low dive rgence among the mtDNA haplotypes suggests that the two life-history t ypes are members of the same evolutionary lineage. Population differen tiation from mtDNA data exceeded that from estimates based on allozyme s. Genetic deviations from expectations suggest that the hatchery stra ins were derived from few individuals. (C) 1997 The Fisheries Society of the British Isles.