Short-distance gene flow in <Emphasis Type="Italic">Populus nigra</Emphasis> L. accounts for small-scale spatial genetic structures: implications for in situ conservation measures |
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Authors: | Georg Rathmacher Marc Niggemann Melanie Köhnen Birgit Ziegenhagen Ronald Bialozyt |
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Institution: | 1.Faculty of Biology, Conservation Biology,Philipps-University of Marburg,Marburg,Germany |
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Abstract: | The European black poplar (Populus nigra L.) is a major species of riparian softwood forests. Due to human influences, it is one of the most threatened tree species
in Europe. For restoration purposes, remaining stands may act as source populations. We analysed a natural population of P. nigra for genetic diversity and spatial genetic structure using seven microsatellite markers. For the first time, paternity analysis
of seedlings as well as juveniles from a restricted area of natural regeneration was used to quantify pollen- and seed-mediated
gene flow, respectively. In both cases, cultivated P. x canadensis trees in vicinity could act as potential parents. Spatial genetic patterns of the adult tree population suggest small-scale
isolation by distance due to short-distance gene flow, the major part of which (i.e. 70%) takes place within distances of
less than 1 km. This helps to explain the reduced diversity in the juveniles. It has implications for the spatial management
of natural regeneration areas within in situ conservation measures. |
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