scholarly journals JOINT SEGREGATION OF BIOCHEMICAL LOCI IN SALMONIDAE. II. LINKAGE ASSOCIATIONS FROM A HYBRIDIZED SALVELINUS GENOME (S. NAMAYCUSH x S. FONTINALIS)

Genetics ◽  
1980 ◽  
Vol 95 (3) ◽  
pp. 707-726
Author(s):  
Bernie May ◽  
Mark Stoneking ◽  
James E Wright
Keyword(s):  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
De Novo ◽  
Homeologous Chromosome ◽  
Homeologous Chromosomes ◽  
Joint Segregation ◽  
Duplicate Loci ◽  
Haploid Complement

ABSTRACT The results of more than 300 parwise examinations of biochemical loci for joint segregation in brook trout (Salvelinus fontinalis) and in the hybridized genome of lake trout (S. namaycush) × brook trout are summarized. Nineteen loci have been assigned to the following eight linkage groupings on the basis of nonrandom assortment, including cases of both classical linkage and pseudolinkage: ODH with PMI with PGI-3, PGI-2 with SDH, ADA-1 with AGP-2, AAT-(1,2) with AGP-1 with MDH-I, MDH-3 with MDH-4, LDH-3 with LDH-4, IDH-3 with ME-2 and GUS with CPK-I. Pseudolinkage (an excess of nonparental progeny types) was observed only for male testcross parents. The results suggest that this phenomenon involves homeologous chromosome arms as evidenced by the de novo association of presumed duplicate loci in each case. Classical linkage has not been found for the five pairs of duplicate loci examined in Salvelinus, suggesting that not all of the eight metacentrics in the haploid complement involve fusions of homeologous chromosomes. Females consistently showed a greater degree of recombination.

A major sextet of mitochondrial DNA phylogenetic assemblages extant in eastern North American brook trout (Salvelinus fontinalis): distribution and postglacial dispersal patterns

1998 ◽  
Vol 76 (7) ◽  
pp. 1300-1318 ◽  
Author(s):  
Roy G Danzmann ◽  
Raymond P Morgan II ◽  
Matthew W Jones ◽  
Louis Bernatchez ◽  
Peter E Ihssen
Keyword(s):  
Mitochondrial Dna ◽  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Large Degree ◽  
Dispersal Patterns ◽  
Small Stream ◽  
South Central ◽  
Haplotype 1

Mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs) of 2422 brook trout (Salvelinus fontinalis) from 60 units (major drainages, small stream catchments, and isolated lakes) representing 155 populations in eastern North America were examined to test hypotheses regarding postglacial dispersal and recolonization. An analysis of molecular variance (AMOVA) indicated that 38.8% of the variation was partitioned among the units, while approximately 60% was distributed among populations (phiST = 59.3) compared with 40.7% within populations. This distribution of variation suggests a large degree of heterogeneity in population founding events and phylogeographic structuring in this species. Comparisons of mtDNA diversity between fish from putative refugial and recolonization zones for this species indicate that more than one refugial region contributed to northern recolonization. Haplotypic diversities in recolonized regions are greatest in south-central populations (i.e., southern Great Lakes region), while only one haplotype (haplotype 1) predominates in northern, western, and eastern postglacial zones. Large phylogenetic differences were found between northern and southern populations. Populations outside the zone of glaciation were the most genetically heterogeneous and were represented by fish from all six (A-F) of the major evolutionary clades identified. Only fish from the A, B, and C clades were found in glaciated regions, with C lineage fish restricted to south-central glaciation zones. Fish from the C clade are putatively the most ancestral lineage within the species based upon composite shared RFLPs with lake trout (Salvelinus namaycush) and Arctic char (Salvelinus alpinus).

A Method of Selecting Trout Hybrids (Salvelinus fontinalis × S. namaycush) for Ability to Retain Swimbladder Gas

1970 ◽  
Vol 27 (1) ◽  
pp. 39-45 ◽  
Author(s):  
J. S. Tait
Keyword(s):  
Brook Trout ◽  
Large Scale ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Swimming Ability ◽  
Parent Species ◽  
Scale Selection ◽  
Early Maturing ◽  
Good Repeatability ◽  
Selection Of

A method was developed for selecting hybrid trout for deep-swimming ability, for use in a breeding program to combine in one strain the early-maturing character of brook trout (Salvelinus fontinalis) with the deep-swimming ability of lake trout (S. namaycush). The method involves testing hybrids in pressure tanks and selecting individuals that, like lake trout, retain most of their swimbladder gas during the test period. For a sample of F2 hybrids the range of pressures at which the fish floated when anaesthetized was almost entirely between the medians for samples of the two parent species. Successive tests of marked individuals showed good repeatability of flotation measurements. The method is concluded to be reliable for large-scale selection of fish with ability to retain swimbladder gas.

Joint Segregation of Biochemical Loci in Salmonidae: Results from Experiments with Salvelinus and Review of the Literature on Other Species

1979 ◽  
Vol 36 (9) ◽  
pp. 1114-1128 ◽  
Author(s):  
Bernie May ◽  
James E. Wright ◽  
Mark Stoneking
Keyword(s):  
Key Words ◽  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Pairwise Comparisons ◽  
Duplicate Genes ◽  
Single Pair ◽  
Review Of The Literature ◽  
Uniform System ◽  
Joint Segregation

An extensive survey of joint segregation is described involving 37 pairwise comparisons of 12 biochemical loci in 11 single pair matings of brook trout (Salvelinus fonlinalis) and 38 pairwise comparisons of 9 loci in an F1 splake (lake trout, Salvelinus namaycush × brook trout) backcross to brook trout mating. We report pseudolinkage of two duplicated malate dehydrogenase loci (MDH-3 and MDH-4) and statistically highly significant nonrandom segregation of MDH-1 with an alphaglycerophosphate dehydrogenase locus (AGP-1). Several additional cases of aberrant joint segregation are described. All known examinations of joint segregation in Salmonidae are reviewed. A uniform system of nomenclature and guidelines for future investigations are discussed. Key words: joint segregation, brook trout, splake hybrid, inheritance, electrophoresis, pseudolinkage, duplicate-genes

Inheritance of Thermal Resistance in Hybrids of Salvelinus fontinalis and S. namaycush

1973 ◽  
Vol 30 (3) ◽  
pp. 401-408 ◽  
Author(s):  
Peter Ihssen
Keyword(s):  
Brook Trout ◽  
Variance Component ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Genetic Model ◽  
Variance Component Analysis ◽  
Parent Species ◽  
Maternal Origin ◽  
Resistant Parent ◽  
Five Factors

The two reciprocal F1 hybrids of brook trout (Salvelinus fontinalis) and lake trout (S. namaycush) had similar times to death on exposure to several lethal high temperatures for a series of acclimation temperatures. These hybrids resembled the brook trout, the more resistant parent, more than the lake trout. The F2 hybrids were intermediate in resistance to the parent species, and the backcrosses intermediate between the F2 hybrids and the respective parents. After acclimation to 5 and 10 C, F2’s and backcrosses arising from the F1 hybrid of brook trout maternal origin were consistently higher in resistance than the F2 and backcrosses arising from the F1 hybrid of lake trout maternal origin. After acclimation to 20 C and above, differences associated with the maternal origin of the F1 hybrid were not found.The number of effective factors segregating was estimated using the techniques of variance component analysis. A genetic model with two codominant factors was found to fit the data for 5 and 10 C acclimation, and one with five factors and dominance of the brook trout factors was found to fit the data for the higher acclimation temperatures.

scholarly journals Host specificity and geographical distribution ofEubothriumin European salmonid fish

2003 ◽  
Vol 77 (3) ◽  
pp. 255-262 ◽  
Author(s):  
T. Scholz ◽  
R. Kuchta ◽  
A.P. Shinn ◽  
V. Šnábel ◽  
V. Hanzelová
Keyword(s):  
Host Specificity ◽  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Arctic Char ◽  
Salmonid Fish ◽  
Coregonus Albula ◽  
Geographical Regions ◽  
South Eastern Europe

AbstractThe host specificity and distribution ofEubothrium crassum(Bloch, 1779) andEubothrium salvelini(Schrank, 1790), morphologically fairly similar pseudophyllidean tapeworms parasitizing salmonid fish, were critically assessed on the basis of morphological and genetic evaluation of extensive material collected from different definitive hosts and geographical regions in Europe.Eubothrium crassumoccurs in fish of the generaSalmo, i.e. salmon (S. salar– both freshwater and marine), sea trout (S. trutta trutta), brown trout (S. truttafario), and lake trout (S. truttalacustris), and also in Danubian salmon (Hucho hucho) and vendace (Coregonus albula).Eubothrium salveliniparasitizes Arctic char (Salvelinus alpinus) and brook trout (Salvelinus fontinalis) in Europe, and also whitefish (Coregonus wartmanni). Rainbow trout (Oncorhynchus mykiss), which is not a native European fish species, was found to be a suitable definitive host for bothEubothriumspecies, which may occur simultaneously in the same fish. Previous records ofE. crassumin Arctic char and brook trout, and those ofE. salveliniin fish of the genusSalmowere most probably misidentifications. Most studies ofEubothriumhave involved salmonids from the northern part of Europe, with few records from southern and south-eastern Europe. This study also confirmed the reliability of the morphology of the apical disc for the discrimination ofE. crassumandE. salvelini.

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