Genetic structure, migration, and patterns of allelic richness among coho salmon (Oncorhynchus kisutch) populations of the Oregon coast

2008 ◽  
Vol 65 (7) ◽  
pp. 1274-1285 ◽  
Author(s):  
Marc A. Johnson ◽  
Michael A. Banks
Keyword(s):  
Genetic Structure ◽  
Allelic Richness ◽  
Coho Salmon ◽  
Current Source ◽  
Oncorhynchus Kisutch ◽  
Effective Population ◽  
Coastal Lake ◽  
Evolutionarily Significant Unit ◽  
Migration Rates ◽  
Source Sink

Genotypic data from eight microsatellite loci are used to infer population structure, effective population size, migration rates, and patterns of allelic richness among wild and hatchery populations of Oregon coastal coho salmon ( Oncorhynchus kisutch ). Corroborating the results of a previous study, we found relatively weak genetic structure among coho from different river basins, although some geographically and ecologically defined clades are supported. Contemporary migration rates among basins appear to be high and asymmetrical. Hatchery populations tended to resemble the wild populations from which they were founded, but presented significantly lower levels of allelic richness. Allelic richness was also low in Oregon coastal lake populations and peaked in the central region of the evolutionarily significant unit among wild river populations. We suggest that the observed patterns may reflect both current source–sink dynamics and post-Pleistocene colonization events.

Inbreeding and effective population size in a coho salmon (Oncorhynchus kisutch) breeding nucleus in Chile

Aquaculture ◽  
2014 ◽  
Vol 420-421 ◽  
pp. S15-S19 ◽  
Author(s):  
José M. Yáñez ◽  
Liane N. Bassini ◽  
Michael Filp ◽  
Jean P. Lhorente ◽  
Raúl W. Ponzoni ◽  
...  
Keyword(s):  
Population Size ◽  
Effective Population Size ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Effective Population

Family Size and Effective Population Size in a Hatchery Stock of Coho Salmon (Oncorhynchus kisutch)

1986 ◽  
Vol 43 (12) ◽  
pp. 2434-2442 ◽  
Author(s):  
Raymond C. Simon ◽  
John D. McIntyre ◽  
A. R. Hemmingsen
Keyword(s):  
Population Size ◽  
Family Size ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Effective Size ◽  
Effective Population ◽  
Data Set ◽  
Hatchery Stock ◽  
Study Population ◽  
Related Population

Means and variances of family size measured in five year-classes of wire-tagged coho salmon (Oncorhynchus kisutch) were linearly related. Population effective size was calculated by using estimated means and variances of family size in a 25-yr data set. Although numbers of age 3 adults returning to the hatchery appeared to be large enough to avoid inbreeding problems (the 25-yr mean exceeded 4500), the numbers actually contributing to the hatchery production may be too low. Several strategies are proposed to correct the problem perceived. Argument is given to support the contention that the problem of effective size is fairly general and is not confined to the present study population.

The influence of family-correlated survival on Nb/N for progeny from integrated multi- and single-generation hatchery stocks of coho salmon (Oncorhynchus kisutch)

2007 ◽  
Vol 64 (9) ◽  
pp. 1258-1265 ◽  
Author(s):  
G R Moyer ◽  
M S Blouin ◽  
M A Banks
Keyword(s):  
Coho Salmon ◽  
Adult Stage ◽  
Oncorhynchus Kisutch ◽  
Parentage Analysis ◽  
Effective Population ◽  
Single Generation ◽  
Marine Life ◽  
A Value ◽  
Significant Difference ◽  
Few Data

There exist surprisingly few data on the final variance and mean of family sizes for hatchery-born fish at the adult stage. Thus, it is difficult to predict, for a conservation hatchery operation that minimizes the variance in progeny number, how much lower the true effective population size (Ne) of a cohort of hatchery-born adults will be than Ne predicted simply by the number of parents that produced them. We used parentage analysis to estimate the survival and Ne for two integrated stocks of hatchery coho salmon (Oncorhynchus kisutch). One hatchery is a multigeneration stock obtained by spawning 70% hatchery with 30% naturally reproducing fish, whereas the second is a single-generation stock derived from naturally reproducing coho. There was no significant difference in average overall survival between stocks, but observed Ne was significantly less than expected for each stock. Family-correlated survival contributed to roughly a 20% reduction in Ne over the freshwater and marine life stages. This reduction is similar to previous estimates and suggests a value that can be used when estimating the effective number of hatchery parents in applications of the Ryman–Laikre formula (at least for programs such as ours that attempt to equalize sex ratios and family sizes).

scholarly journals Low effective population size and high spatial genetic structure of black poplar populations from the Oder valley in Poland

2021 ◽  
Vol 78 (2) ◽  
Author(s):  
Błażej Wójkiewicz ◽  
Andrzewj Lewandowski ◽  
Weronika B. Żukowska ◽  
Monika Litkowiec ◽  
Witold Wachowiak
Keyword(s):  
Genetic Structure ◽  
Genetic Resources ◽  
Population Size ◽  
Effective Population Size ◽  
Spatial Genetic Structure ◽  
Demographic History ◽  
River Valley ◽  
Ex Situ ◽  
Effective Population ◽  
Black Poplar

Abstract Context Black poplar (Populus nigra L.) is a keystone species of European riparian ecosystems that has been negatively impacted by riverside urbanization for centuries. Consequently, it has become an endangered tree species in many European countries. The establishment of a suitable rescue plan of the remaining black poplar forest stands requires a preliminary knowledge about the distribution of genetic variation among species populations. However, for some parts of the P. nigra distribution in Europe, the genetic resources and demographic history remain poorly recognized. Aims Here, we present the first study on identifying and characterizing the genetic resources of black poplar from the Oder valley in Poland. This study (1) assessed the genetic variability and effective population size of populations and (2) examined whether gene flow is limited by distance or there is a single migrant pool along the studied river system. Methods A total of 582 poplar trees derived from nine black poplar populations were investigated with nuclear microsatellite markers. Results (1) The allelic richness and heterozygosity level were high and comparable between populations. (2) The genetic structure of the studied poplar stands was not homogenous. (3) The signatures of past bottlenecks were detected. Conclusion Our study (1) provides evidence for genetic substructuring of natural black poplar populations from the studied river catchment, which is not a frequent phenomenon reported for this species in Europe, and (2) indicates which poplar stands may serve as new genetic conservation units (GCUs) of this species in Europe. Key message The genetic resources of black poplar in the Oder River valley are still substantial compared to those reported for rivers in Western Europe. On the other hand, clear signals of isolation by distance and genetic erosion reflected in small effective population sizes and high spatial genetic structure of the analyzed populations were detected. Based on these findings, we recommend the in situ and ex situ conservation strategies for conserving and restoring the genetic resources of black poplar populations in this strongly transformed by human river valley ecosystem.

Induced ovulation in coho salmon (Oncorhynchus kisutch). I. Further studies on the use of salmon pituitary preparations

Aquaculture ◽  
1981 ◽  
Vol 26 (1-2) ◽  
pp. 117-127 ◽  
Author(s):  
George A. Hunter ◽  
Edward M. Donaldson ◽  
Helen M. Dye
Keyword(s):  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Induced Ovulation
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