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Quantitative genetic effects of bottlenecks: experimental evidence from a wild plant species, Nigella degenii
Lund University, Department of Ecology. (Section of Plant Ecology and Systematics)
Lund University, Department of Ecology. (Section of Plant Ecology and Systematics)
University of East Anglia, School of Biological Sciences. (Center for Ecology, Evolution, and Conservation)
Stockholm University, Faculty of Science, Department of Zoology.
2010 (English)In: Journal of Heredity, ISSN 0022-1503, E-ISSN 1465-7333, Vol. 101, no 3, 298-307 p.Article in journal (Refereed) Published
Abstract [en]

Understanding the genetic consequences of changes in population size is fundamental in a variety of contexts, such as adaptation and conservation biology. In the study presented here, we have performed a replicated experiment with the plant Nigella degenii to explore the quantitative genetic effects of a single-founder bottleneck. In agreement with adetive theory, the bottleneck reduced the mean (co)variance within lines and caused stochastic, line-specific changes in the genetic (co)variance structure. However, a significant portion of the (co)variance structure was conserved, and 2 characters—leaf and flower (sepal) size—turned out to be positively correlated in all data sets, indicating a potential for correlated evolution in these characters, even after a severe bottleneck. The hierarchical partitioning of genetic variance for flower size was in good agreement with predictions from additive theory, whereas the remaining characters showed an excess of within-line variance and a deficiency of among-line variance. The latter discrepancies were most likely a result of selection, given the small proportion of lines (23%) that remained viable until the end of the experiment. Our results suggest that bottlenecked populations of N. degenii generally have a lower adaptive potential than the ancentral population but also highlight the idiosyncratic nature of bottleneck effects.

Place, publisher, year, edition, pages
2010. Vol. 101, no 3, 298-307 p.
Keyword [en]
bottleneck, evolutionary constraint, G matrix, genetic drift, Nigella degenii
National Category
Biological Sciences
Research subject
URN: urn:nbn:se:su:diva-32485DOI: 10.1093/jhered/esp108OAI: diva2:280720
Available from: 2009-12-11 Created: 2009-12-11 Last updated: 2010-12-30Bibliographically approved

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Palmé, Anna
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