| Titre : | Temporal and spatial genetic variation in a metapopulation of the annual Erysimum cheiranthoides on stony river banks |
| Auteurs : | Olivier Honnay, Auteur ; Hans Jacquemyn, Auteur ; Kris Van Looy, Auteur ; Katrien Vandepitte, Auteur ; Peter Breyne, Auteur |
| Type de document : | Article |
| Dans : | Journal of Ecology (97(1) JAN 2009) |
| Article en page(s) : | 131-141 |
| Langues: | Anglais |
| Résumé : | 1. Metapopulation dynamics - the recurrent extinction and colonization in spatially discrete habitats - is expected to strongly affect within and between population genetic diversity. So far, however, accounts of true plant metapopulations are extremely scarce. 2. We monitored the colonization and extinction dynamics of an assemblage of populations of the annual Erysimum cheiranthoides on stony river banks during three consecutive years. Each year, winter flooding drives some populations to extinction, while vacant banks may become colonized. We describe the dynamics of these ephemeral populations using amplified fragment length polymorphism (AFLP) markers to quantify changes in the metapopulation genetic structure over time, and assessing the direction and relative amount of migration and colonization events. 3. Average extinction and colonization rates were high (0.39 and 0.34, respectively). While population genetic differentiation (F(ST)) tripled from 0.06 in 2005 to 0.17 in 2007, total metapopulation genetic diversity remained fairly constant through the years. Genetic assignment analyses allowed assigning more than 50% of the genotyped individuals to populations extant the year before. Colonizing individuals originated from different source populations (phi |



