Population structure and divergence using microsatellite and gene locus markers in Chinook salmon (Oncorhynchus tshawytscha) populations

2006 ◽  
Vol 63 (6) ◽  
pp. 1370-1383 ◽  
Author(s):  
Daniel D Heath ◽  
J Mark Shrimpton ◽  
Russell I Hepburn ◽  
Sara K Jamieson ◽  
Sarah K Brode ◽  
...  
Keyword(s):  
Population Structure ◽  
Local Adaptation ◽  
Mhc Class Ii ◽  
Chinook Salmon ◽  
Microsatellite Loci ◽  
Gene Locus ◽  
Oncorhynchus Tshawytscha ◽  
Geographic Distance ◽  
Class Ii ◽  
Population Divergence

Using different classes of genetic markers can provide insight into the role of selection, as well as a broader context for identifying population differentiation. We used nine microsatellite loci and polymorphisms at eight gene loci (major histocompatibility complex (MHC) classes I and II, growth hormones 1 and 2, transferrin, and immunoglobin heavy-chain) to determine population structure in six coastal populations (Vancouver Island, VI) and five interior populations (Fraser River, FR) of Chinook salmon (Oncorhynchus tshawytscha) in British Columbia, Canada. FST and [Formula: see text] values for specific VI gene loci were significantly higher than those for the FR and VI microsatellite loci or the FR gene loci. Pairwise microsatellite FST values were correlated with geographic distance across regions, but not using the gene locus marker data. Neighbor-joining cluster analyses showed one VI population as particularly divergent based on the gene locus data, while the VI and FR microsatellite locus and the FR gene locus analyses yielded no anomalous population divergence. The VI MHC class II marker FST values were exceptionally high, indicative of probable directional selection acting on MHC class II. Our results are consistent with local adaptation in Chinook salmon, but the nature of the local adaptation likely differs among regions.

Behavioural and genetic analyses of mate choice and reproductive success in two Chinook salmon populations

2013 ◽  
Vol 70 (2) ◽  
pp. 263-270 ◽  
Author(s):  
Melissa L. Evans ◽  
Bryan D. Neff ◽  
Daniel D. Heath
Keyword(s):  
Sexual Selection ◽  
Natural Selection ◽  
Reproductive Success ◽  
Mate Choice ◽  
Mhc Class Ii ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Mating Behaviour ◽  
Selection Pressures ◽  
Evolutionary Force

Sexual selection is recognized as an important evolutionary force in salmon. However, relatively little is known about variation in sexual selection pressures across salmon populations or the potential role of natural selection as a driver of adaptive mating patterns. Here, we examine mating behaviour and correlates of reproductive success in Chinook salmon (Oncorhynchus tshawytscha) from the Quinsam and Little Qualicum rivers in British Columbia, Canada — two populations for which we have previously found evidence of natural selection operating on major histocompatibility complex (MHC) genes. In both populations, males courted females and exhibited dominance behaviour towards other males, and the frequency of each behaviour was positively associated with reproductive success. Males were more aggressive towards females with whom they would produce offspring of low or high MHC class II diversity, and the offspring of males from the Quinsam River exhibited higher diversity at the MHC class I than expected. We discuss our results in relation to local natural selection pressures on the MHC and the potential for MHC-dependent mate choice.

scholarly journals Genotyping by sequencing resolves shallow population structure to inform conservation of Chinook salmon ( Oncorhynchus tshawytscha )

2014 ◽  
Vol 7 (3) ◽  
pp. 355-369 ◽  
Author(s):  
Wesley A. Larson ◽  
Lisa W. Seeb ◽  
Meredith V. Everett ◽  
Ryan K. Waples ◽  
William D. Templin ◽  
...  
Keyword(s):  
Population Structure ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Genotyping By Sequencing

scholarly journals MHC class II DRB diversity, selection pattern and population structure in a neotropical bat species, Noctilio albiventris

Heredity ◽  
2011 ◽  
Vol 107 (2) ◽  
pp. 115-126 ◽  
Author(s):  
J Schad ◽  
D K N Dechmann ◽  
C C Voigt ◽  
S Sommer
Keyword(s):  
Population Structure ◽  
Mhc Class Ii ◽  
Class Ii ◽  
Selection Pattern

scholarly journals Sexual conflict inhibits female mate choice for major histocompatibility complex dissimilarity in Chinook salmon

2009 ◽  
Vol 277 (1683) ◽  
pp. 885-894 ◽  
Author(s):  
Shawn R. Garner ◽  
Romina N. Bortoluzzi ◽  
Daniel D. Heath ◽  
Bryan D. Neff
Keyword(s):  
Major Histocompatibility Complex ◽  
Mhc Class Ii ◽  
Sexual Conflict ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Mating Behaviour ◽  
Female Mate Choice ◽  
Major Histocompatibility ◽  
Male Harassment ◽  
Histocompatibility Complex

In many species females prefer major histocompatibility complex (MHC) dissimilar mates, which may improve offspring resistance to pathogens. However, sexual conflict may interfere with female preference when males attempt to mate with all females, regardless of compatibility. Here we used semi-natural spawning channels to examine how mating behaviour and genetic similarity at the MHC class II peptide binding region affected parentage patterns in Chinook salmon ( Oncorhynchus tshawytscha ). We found that females directed aggression at more MHC-similar males than expected by chance, providing a possible mechanism of female MHC choice in salmon. Males also directed aggression towards MHC-similar females, which was consistent with males harassing unreceptive mates. Males' aggression was positively correlated with their reproductive success, and it appeared to overcome female aversion to mating with MHC-similar males, as females who were the target of high levels of male aggression had lower than expected MHC divergence in their offspring. Indeed, offspring MHC divergence was highest when the sex ratio was female-biased and male harassment was likely to be less intense. These data suggest that male harassment can reduce female effectiveness in selecting MHC-compatible mates, and sexual conflict can thus have an indirect cost to females.

scholarly journals Comparative Genome Mapping Between Chinook Salmon (Oncorhynchus tshawytscha) and Rainbow Trout (O. mykiss) Based on Homologous Microsatellite Loci

2013 ◽  
Vol 3 (12) ◽  
pp. 2281-2288 ◽  
Author(s):  
Kerry A. Naish ◽  
Ruth B. Phillips ◽  
Marine S. O. Brieuc ◽  
Lyndsay R. Newton ◽  
Anna E. Elz ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Chinook Salmon ◽  
Microsatellite Loci ◽  
Oncorhynchus Tshawytscha ◽  
Genome Mapping ◽  
Comparative Genome ◽  
Comparative Genome Mapping

Growth and salinity tolerance of juvenile chinook salmon (Oncorhynchus tshawytscha) from two introduced New Zealand populations

1998 ◽  
Vol 76 (12) ◽  
pp. 2219-2226 ◽  
Author(s):  
Michael T Kinnison ◽  
Martin J Unwin ◽  
Thomas P Quinn
Keyword(s):  
New Zealand ◽  
Chinook Salmon ◽  
Oncorhynchus Tshawytscha ◽  
Population Divergence ◽  
Phenotypic Traits ◽  
First Year ◽  
Short Time Scale ◽  
Family Effects ◽  
Yolk Absorption ◽  
Size Growth

Self-sustaining populations of chinook salmon (Oncorhynchus tshawytscha) were established in New Zealand, from a common introduction group, near the turn of the 20th century. To investigate possible population divergence over this relatively short time scale we compared size, growth, and hypersalinity tolerance of families from two populations over their first year of rearing under shared conditions. Differences in initial fry mass were consistent with egg-size differences, but there was also evidence of genetic differences in early growth rates. Size differences between the populations decreased over time and rank correlations of mean family mass with initial egg and fry masses degraded over increasing intervals to nearly zero by the end of the year. Population effects on hypersalinity tolerance were not apparent after 4, 6, or 10 months of rearing (from yolk absorption), but family effects were suggested by ANOVAs and by the existence of groups of families with seemingly different relative seasonal optima for tolerance. Thus far, investigation of juvenile traits under common environmental conditions has shown less genetic divergence between the two New Zealand populations than is suggested by the range of differences found for phenotypic traits measured on wild adults in previous investigations.

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