TEMPORAL CHANGE OF MITOCHONDRIAL-DNA HAPLOTYPE FREQUENCIES AND FEMALEEFFECTIVE SIZE IN A BROWN TROUT (SALMO-TRUTTA) POPULATION

We report data on genetic drift of mitochondrial DNA (mtDNA) haplotype s in a natural brown trout (Salmo trutta) population in Sweden. Large temporal frequency shifts were observed over the 14 consecutive year c lasses studied. The observed rate of drift was used to estimate the ef fective size of the population. This effective size applies to the fem ale segment of the population as mtDNA is maternally inherited. The ma gnitude of mtDNA haplotype frequency change is compared with the corre sponding allele frequency changes at 14 allozyme loci in the same popu lation. The female effective size is estimated as 58, which is approxi mately half the effective size of 97 for the total population (both se xes) previously obtained from the shifts of allozyme allele frequencie s.