Relationships between genetic diversity and number of successive generations in hatchery populations of ayu Plecoglossus altivelis assessed by microsatellite DNA polymorphism

実, 池田; 秀蔵, 高木; 順彦, 谷口

doi:10.2331/suisan.71.768

Cited by 8 publications

(18 citation statements)

References 25 publications

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“…The same result was reported in hatchery populations of ayu (Ikeda et al, 2005). In addition, the present study clearly demonstrated that the degree of genetic differentiation from wild individuals increased with an increase in generations of domestication, indicating that large genetic alterations occurred during successive generations of domestication.…”

Section: Discussionsupporting

confidence: 88%

“…In addition, successive generations of domestication are accompanied by population bottlenecks and subsequent genetic drift and thus bring further opportunities to decrease genetic variation in hatchery populations. A considerable reduction in genetic variation with an increase in successive generations of domestication was reported in hatchery populations of ayu Plecoglossus altivelis altivelis (Temminck & Schlegel) (Iguchi et al, 1999;Ikeda et al, 2005).…”

Section: Introductionmentioning

confidence: 97%

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Comparison of genetic diversity at microsatellite loci and quantitative traits in hatchery populations of Japanese flounder Paralichthys olivaceus

Shikano

Shimada

Suzuki

2008

Journal of Fish Biology

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Relationships of genetic diversity at microsatellite loci and quantitative traits were examined in hatchery-produced populations of Japanese flounder using a relatively straightforward experiment. Five hatchery populations produced by wild-caught and domesticated broodstocks were used to examine the effects of different levels (one to three generations) of domestication on the genetic characteristics of hatchery populations. Allelic richness at seven microsatellite loci in all hatchery populations was lower than that in a wild population. Genetic variation measured by allelic richness and heterozygosity tended to decrease with an increase in generations of domestication. In addition, the degree of genetic differentiation from a wild population increased with an increase in generations of domestication. Significant differences in three morphometric traits (dorsal and anal fin ray counts and vertebral counts) and three physiological traits (high temperature, salinity and formalin tolerance) were observed among the hatchery populations. The degree of phenotypic difference among populations was larger in morphometric traits than in physiological traits. The divergence pattern of some quantitative traits was similar to that observed at microsatellite loci, suggesting that domestication causes the decrease of genetic variation and the increase of genetic differentiation for some quantitative traits concomitantly with those for microsatellite loci. Significant positive correlation was observed between F ST and the degree of phenotypic difference in the three morphometric traits and formalin tolerance, indicating that genetic variation at microsatellite loci predicts the degree of phenotypic divergence in some quantitative traits.

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Section: Discussionsupporting

confidence: 88%

Section: Introductionmentioning

confidence: 97%

Comparison of genetic diversity at microsatellite loci and quantitative traits in hatchery populations of Japanese flounder Paralichthys olivaceus

Shikano

Shimada

Suzuki

2008

Journal of Fish Biology

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“…This indicates that the management procedure of obtaining offspring from multi‐year‐class parents each year 14 had contributed to conserve genetic diversity, both of nuclear DNA and mtDNA. This contrasts with P. altivelis , which has an annual life history and shows a marked reduction in genetic diversity during cultivation over multiple generations 39,40 …”

Section: Discussionmentioning

confidence: 95%

An assessment of genetic diversity in wild and captive populations of endangered Japanese bitterling Tanakia tanago (Cyprinidae) using amplified fragment length polymorphism (AFLP) markers

Kubota

Watanabe

Kakehi³

et al. 2008

Fisheries Sci

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The Japanese bitterling Tanakia tanago (Cyprinidae) is on the verge of extinction in the wild, placing great importance on captive breeding programs for current conservation of the species. However, the loss of genetic diversity during captive breeding is an ongoing matter of concern. Since some captive populations have been almost monomorphic in mitochondrial DNA (mtDNA), this hampers assessments of their genetic diversity during captive breeding. To more accurately assess their genetic diversity, one wild and three captive populations were examined using amplified fragment length polymorphism (AFLP) markers. Estimates of average heterozygosity and nucleotide diversity ranged 0.0479-0.1920 and 0.0023-0.0088, respectively, enabling comparison of genetic diversity among the wild and captive populations, and among year-classes of captive populations. Significant differences in numbers of amplified fragments and proportions of polymorphic fragments were observed among year-classes of all populations. The indices of genetic diversity calculated from AFLP seemed to be, however, less sensitive to weak bottlenecks. No continuous decrease in genetic diversity in nuclear DNA was detected in presently captive populations. This supports the possibility of re-introduction of the captive populations into the original habitats, although survival and reproductive ability in the wild must be taken into consideration.

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“…Yet fish cultivations are typically carried out under breeding selection that differs from natural selective pressure that wild animals have to encounter. The genetic variation maintained in a hatchery depends on the domestication history 9–11 …”

Section: Introductionmentioning

confidence: 99%

“…Habitat destruction or blockage of migration routes by dams often causes a decline in the abundance of amphidromous populations in rivers, which has promoted transplantation with non‐native fish. Because of the limited circulation of wild fish, hatchery populations have an increasing share in stocks for supplementation 11,12 . In many hatcheries, however, artificial populations were started before genetically based stock management was realized to be critical.…”

Section: Introductionmentioning

confidence: 99%

Effect of introducing wild paternity on stock performance of hatchery-reared ayu

Iguchi¹,

Mogi

2007

Fisheries Sci

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The domestication of ayu Plecoglossus altivelis, in which breeding has been carried out for multiple generations without the introduction of exotic broodstock (purebred-styled cultivation), causes rapid loss of genetic variability, and is problematic for resource management programs. The introduction of wild paternity to enhance genetic variability was examined for its effects on the performance of the newly hybridized stock using the Gunma population (hatchery strain), which has been inbred for 29 generations since its origin. Principal component analysis showed that hybridization could modify the stock performance, moderately affecting behavior and morphometrics. Reinforcement of aggressiveness as well as transformation to a long-nosed shape in the hybrid population contributed revised performance that was acceptable to sports fishers as an artificial stock. To reduce genetic stress for native ayu populations, the introduction of wild paternity is proposed through sperm from wild caught specimens to hybridize with eggs from the pure-bred hatchery population.

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Relationships between genetic diversity and number of successive generations in hatchery populations of ayu Plecoglossus altivelis assessed by microsatellite DNA polymorphism

Cited by 8 publications

References 25 publications

Comparison of genetic diversity at microsatellite loci and quantitative traits in hatchery populations of Japanese flounder Paralichthys olivaceus

Comparison of genetic diversity at microsatellite loci and quantitative traits in hatchery populations of Japanese flounder Paralichthys olivaceus

An assessment of genetic diversity in wild and captive populations of endangered Japanese bitterling Tanakia tanago (Cyprinidae) using amplified fragment length polymorphism (AFLP) markers

Effect of introducing wild paternity on stock performance of hatchery-reared ayu

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