Spatial structure and clonal distribution of genotypes in the rare Typha minima Hoppe (Typhaceae) along a river system |
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Authors: | Irène Till-Bottraud Bénédicte N Poncet Delphine Rioux and Jacky Girel |
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Institution: | (1) Laboratoire d’Ecologie Alpine, UMR CNRS 5553, Universit? Joseph Fourier, BP 53, 38041 Grenoble Cedex 9, France |
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Abstract: | We studied the genetic diversity of the dwarf bulrush (Typha minima) along a 60 km section of the Isère river using AFLP markers. Total clonality was relatively low (proportion of distinguishable
genotypes = 0.70) but extremely variable among populations with one monoclonal population and several populations where all
sampled individuals were different. Genetic diversity was high (He = 0.129) and again variable among populations. Although
no major genetic discontinuity could be detected, gene flow was found to be limited. Our results show a much higher diversity
compared to Swiss populations. The high genetic diversity within most populations despite the species’ potentially important
clonal growth indicates that populations are relatively young. This is in line with the fact that the species lives in open
habitats created by high floods that erase river banks leading to a metapopulation dynamics. However the metapopulation dynamics
is at least partly disturbed as gene flow appears to be restricted so that our populations are probably at risk if no action
is taken to re-establish more natural river flow dynamics. |
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