Increased genetic variance after a population bottleneck

Carson, Hampton L.

doi:10.1016/0169-5347(90)90137-3

Cited by 150 publications

(120 citation statements)

References 19 publications

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“…These data correspond with the general finding that reduced heterozygosity does not only lower individual fitness, but may also increase the amount of variation among progeny since 'developmental homeostasis' is disturbed in homozygotes (Mitton and Grant 1984;Mitton 1989). Other studies have found that genetic variance increased rather than decreased after founder events or population bottlenecks (Goodnight 1988;Bryant et al 1986;Carson 1990). Small populations can therefore also be expected to show increased instead of reduced variation in fitness components among their progeny, which may be an explanation for the negative correlation coefficients between most of the coefficients of variation and population size that were found in this study.…”

Section: Discussionsupporting

confidence: 88%

Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae)

1994

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Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae) Oostermeijer, J.G.B.; van Eijck, M.W.; den Nijs, J.C.M. Published in: Oecologia DOI:10.1007/BF00317317 Link to publication Citation for published version (APA):Oostermeijer, J. G. B., van Eijck, M. W., & den Nijs, J. C. M. (1994). Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae). Oecologia, 97, 289-296. DOI: 10.1007/BF00317317 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae) Received: 5 February 1993 / Accepted: 8 December 1993 Abstract Seeds were sampled from 19 populations of the rare Gentiana pneumonanthe, ranging in size from 5 to more than 50,000 flowering plants. An analysis was made of variation in a number of life-history characters in relation to population size and offspring heterozygosity (based on seven polymorphic isozyme loci). Life-history characters included seed weight, germination rate, proportion of seeds germinating, seedling mortality, seedling weight, adult weight, flower production per plant and proportion of plants flowering per family. Principal component analysis (PCA) reduced the dataset to three main fitness components. The first component was highly correlated with adult weight and flowering performance, the second with germination performance and the third component with seed and seedling weight and seedling mortality. The latter two components were considered as being maternally influenced, since these comprised life-history traits that were significantly correlated with seed weight. Multiple regression analysis showed that variation in the first fitness component was mainly associated with heterozygosity and not with population size, while the third fitness component was only correlated with population size and not with heterozygosity. The latter relationship appeared to be non-linear, which suggests a stronger loss of fitness in the smallest populations. The second (germination) component was neither correlated with population size nor with genetic variati...

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Section: Discussionsupporting

confidence: 88%

Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae)

1994

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“…Experimental data supporting this conversion of nonadditive into additive variance are scarce (see Carson, 1990, for a review). In Musca domestica, Bryant et a!.…”

Section: Introductionmentioning

confidence: 99%

The effect of inbreeding on the redistribution of genetic variance of fecundity and viability in Tribolium castaneum

Fernández¹,

Toro²,

López-Fanjul

1995

Heredity

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Inbreeding was carried out to investigate the genetic properties of fecundity and viability (early and late) in a population of Tribolium castaneum. Heritability estimates in the base population were intermediate for fecundity and small and nonsignificant for viability. All traits showed strong inbreeding depression. For both viability traits, a significant increase of both within-line additive variance and between-line variance was observed with inbreeding. For fecundity, however, these changes were not detected. The results are compatible with the genetic variance of viability in the base population being generated by segregation of a number of deleterious recessive alleles at low frequencies. For fecundity, an additional class of loci with substantial additive effects must be postulated.

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“…Bottlenecks are therefore thought to be involved in speciation events (e.g. Mayr 1963;Carson 1990;Slatkin 1996), heterozygote de¢ciency in natural populations (Nei & Graur 1984), low levels of genetic variation (Bonnell & Selander 1974;O'Brien et al 1983;Ellegren et al 1996;Groombridge et al 2000), and reduced reproductive function (Wildt et al 1987;Madsen et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Immigration and the ephemerality of a natural population bottleneck: evidence from molecular markers

Keller

Jeffery

Arcese

et al. 2001

Proc. R. Soc. Lond. B

256

234

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Population bottlenecks are often invoked to explain low levels of genetic variation in natural populations, yet few studies have documented the direct genetic consequences of known bottlenecks in the wild. Empirical studies of natural population bottlenecks are therefore needed, because key assumptions of theoretical and laboratory studies of bottlenecks may not hold in the wild. Here we present microsatellite data from a severe bottleneck (95% mortality) in an insular population of song sparrows (Melospiza melodia). The major ¢ndings of our study are as follows: (i) The bottleneck reduced heterozygosity and allelic diversity nearly to neutral expectations, despite non-random survival of birds with respect to inbreeding and wing length. (ii) All measures of genetic diversity regained pre-bottleneck levels within two to three years of the crash. This rapid recovery was due to low levels of immigration. (iii) The rapid recovery occurred despite a coincident, strong increase in average inbreeding. These results show that immigration at levels that are hard to measure in most ¢eld studies can lead to qualitatively very di¡erent genetic outcomes from those expected from mutations only. We suggest that future theoretical and empirical work on bottlenecks and metapopulations should address the impact of immigration.

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Increased genetic variance after a population bottleneck

Cited by 150 publications

References 19 publications

Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae)

Offspring fitness in relation to population size and genetic variation in the rare perennial plant species Gentiana pneumonanthe (Gentianaceae)

The effect of inbreeding on the redistribution of genetic variance of fecundity and viability in Tribolium castaneum

Immigration and the ephemerality of a natural population bottleneck: evidence from molecular markers

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