scholarly journals REPRODUCTIVE ISOLATION WITH LITTLE GENETIC DIVERGENCE IN SYMPATRIC POPULATIONS OF BROWN TROUT (SALMO TRUTTA)

Genetics ◽  
1979 ◽  
Vol 92 (1) ◽  
pp. 247-262
Author(s):  
Nils Ryman ◽  
Fred W Allendorf ◽  
Gunnar Ståhl
Keyword(s):  
Gene Flow ◽  
Lactate Dehydrogenase ◽  
Brown Trout ◽  
Genetic Divergence ◽  
Salmo Trutta ◽  
Morphological Differentiation ◽  
Ecological Perspective ◽  
Mountain Lake ◽  
Sympatric Populations ◽  
Brown Trout Salmo Trutta

ABSTRACT Two reproductively isolated demes of brown trout coexist in a small Swedish mountain lake, Lake Bunnersjoarna. We electrophoretically examined 102 specimens from that lake for 27 enzymes encoded by 54 loci. The two demes are fixed for different alleles at a lactate dehydrogenase locus (LDH-1); statistically significant allele frequency differences at five other loci further support the complete lack of gene flow between these demes. There are significant differences in growth rates between fish in the two demes, but no further morphological differentiation has been detected.——In light of these findings, the genetic distance between these populations is surprisingly small (NEI'S I=0.975). These demes represent one of the least genetically divergent, reproductively isolated sympatric pair of vertebrate populations that have been identified. The results are discussed from both an evolutionary and ecological perspective.

Seascape and its effect on migratory life-history strategy influences gene flow among coastal brown trout (Salmo trutta) populations in the English Channel

2015 ◽  
Vol 43 (3) ◽  
pp. 498-509 ◽  
Author(s):  
Erwan Quéméré ◽  
Jean-Luc Baglinière ◽  
Jean-Marc Roussel ◽  
Guillaume Evanno ◽  
Philip McGinnity ◽  
...  
Keyword(s):  
Life History ◽  
Gene Flow ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Life History Strategy ◽  
English Channel ◽  
Brown Trout Salmo Trutta

Mitochondrial DNA differentiation of sympatric populations of brown trout, Salmo trutta L., from Lough Melvin, Ireland

1995 ◽  
Vol 52 (8) ◽  
pp. 1617-1622 ◽  
Author(s):  
H. P. McVeigh ◽  
R. A. Hynes ◽  
A. Ferguson
Keyword(s):  
Mitochondrial Dna ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Rflp Analysis ◽  
Restriction Enzymes ◽  
Sympatric Populations ◽  
Marker System ◽  
Homing Behaviour ◽  
Brown Trout Salmo Trutta ◽  
Larger Sample

RFLP analysis of mitochondrial DNA (mtDNA) was used to study variation within and between ferox, sonaghen, and gillaroo, the local names of three types of brown trout, Salmo trutta L., which live sympatrically in Lough Melvin, northwest Ireland. They spawn in separate rivers or sections of rivers and thus maintain reproductive integrity by their innate homing behaviour. In this study, 12 restriction enzymes were used to survey 4.9% of the genome in 37 trout. Five of the enzymes were informative (AvaII, HaeIII, HinfI, MboI, and XbaI) and these were used to examine an additional 139 trout. Seven mtDNA haplotypes were found in the first 37 trout and one further haplotype, owing to variation at MboI sites, was found in the larger sample of trout. All of the ferox were monomorphic at all sites examined whereas six haplotypes were found among the gillaroo, three of which were unique to this group. Five haplotypes were found among the sonaghen, two of which were found only in this group. Sonaghen and gillaroo share three haplotypes but they are present in each at different frequencies. Relative to morphological, allozyme, and multilocus probe results, mtDNA provides the most discriminating marker system for these trout.

Minimal gene flow from introduced brown trout (Salmo trutta L.) after 30 years of stocking

2006 ◽  
Vol 22 (2) ◽  
pp. 119-124 ◽  
Author(s):  
J. Heggenes ◽  
O. Skaala ◽  
R. Borgstrom ◽  
O. T. Igland
Keyword(s):  
Gene Flow ◽  
Brown Trout ◽  
Salmo Trutta ◽  
Brown Trout Salmo Trutta
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