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Estimating seed vs. pollen dispersal from spatial genetic structure in the common ash
M Heuertz1, X Vekemans, J-F Hausman
1Centre de Recherche Public-Gabriel Lippmann, CREBS Research Unit, avenue de la Faïencerie 162a, L-1511 Luxembourg, Luxembourg. myriamheuertz@gmx.net
Molecular Ecology
|August 16, 2003
Summary
Spatial genetic structure analysis in common ash (Fraxinus excelsior L.) reveals insights into gene flow. The study quantifies total gene dispersal and estimates restricted seed and moderate pollen flow contributions.
Area of Science:
- Ecology
- Population Genetics
- Forest Science
Background:
- Common ash (Fraxinus excelsior L.) is a widespread European tree species.
- Understanding gene flow is crucial for forest management and conservation.
- Wind pollination and dispersal characterize Fraxinus excelsior.
Purpose of the Study:
- To analyze the spatial genetic structure of a Romanian common ash population.
- To investigate the relative contributions of seed and pollen dispersal to gene flow.
- To estimate total gene dispersal and differentiate between seed and pollen mediated gene flow.
Main Methods:
- Utilized five highly polymorphic microsatellite loci for genetic analysis.
- Analyzed the decrease in kinship coefficients with geographical distance.
- Compared observed genetic structure patterns with simulation results.
Main Results:
- The slope of kinship against the logarithm of distance estimated total gene dispersal (Nb = 519 individuals).
- The shape component indicated restricted seed flow (σs ≤ 14 m).
- Moderate pollen flow was estimated (70 m ≤ σp ≤ 140 m), though precise quantification was limited by data stochasticity.
Conclusions:
- Spatial genetic structure analysis at biparentally inherited loci provides insights into seed and pollen dispersal contributions.
- Common ash exhibits restricted seed dispersal and moderate pollen dispersal.
- These findings are valuable for conservation strategies and understanding forest dynamics.