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Migration load in plants: role of pollen and seed dispersal in heterogeneous landscapes

  1. S. LOPEZ1,
  2. F. ROUSSET1,
  3. F. H. SHAW1,2,
  4. R. G. SHAW1,3,
  5. O. RONCE1

Article first published online: 7 NOV 2007

DOI: 10.1111/j.1420-9101.2007.01442.x

Issue

Journal of Evolutionary Biology

Journal of Evolutionary Biology

Volume 21, Issue 1, pages 294–309, January 2008

Additional Information

How to Cite

LOPEZ, S., ROUSSET, F., SHAW, F. H., SHAW, R. G. and RONCE, O. (2008), Migration load in plants: role of pollen and seed dispersal in heterogeneous landscapes. Journal of Evolutionary Biology, 21: 294–309. doi: 10.1111/j.1420-9101.2007.01442.x

Author Information

  1. 1

    Institut des Sciences de l'Evolution (UM2-CNRS), Université Montpellier 2, Montpellier, France

  2. 2

    Department of Mathematics, Hamline University, St Paul, MN, USA

  3. 3

    Department of Ecology, Evolution and Behaviour, University of Minnesota, St Paul, MN, USA

*Ophélie Ronce, Institut des Sciences de l'Evolution (UM2-CNRS), Université Montpellier 2, Place Eugène Bataillon, CC 65, 34 095 Montpellier cedex 5, France. Tel.: +33 4 67 14 32 50; fax: +33 4 67 14 36 22; e-mail: ronce@isem.univ-montp2.fr

Publication History

  1. Issue published online: 7 NOV 2007
  2. Article first published online: 7 NOV 2007
  3. Received 16 July 2007; revised 3 September 2007; accepted 6 September 2007

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Keywords:

  • dispersal;
  • local adaptation;
  • metapopulation;
  • pollen;
  • quantitative genetics;
  • seed

Abstract

Evolution of local adaptation depends critically on the level of gene flow, which, in plants, can be due to either pollen or seed dispersal. Using analytical predictions and individual-centred simulations, we investigate the specific influence of seed and pollen dispersal on local adaptation in plant populations growing in patchy heterogeneous landscapes. We study the evolution of a polygenic trait subject to stabilizing selection within populations, but divergent selection between populations. Deviations from linkage equilibrium and Hardy–Weinberg equilibrium make different contributions to genotypic variance depending on the dispersal mode. Local genotypic variance, differentiation between populations and genetic load vary with the rate of gene flow but are similar for seed and pollen dispersal, unless the landscape is very heterogeneous. In this case, genetic load is higher in the case of pollen dispersal, which appears to be due to differences in the distribution of genotypic values before selection.

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