To the importance of genetic diversity of Phragmites australisin the development of reed stands |
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Authors: | Koppitz Heike Kühl Harald |
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Institution: | (1) Department of Biology/Ecology, Humboldt-University Berlin, Unter den Linden 6, D-10099 Berlin, Germany |
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Abstract: | Reed stands in Germany and Europe were investigatedwith respect to their genetic diversity by means ofRandom Amplified Polymorphic DNA (RAPD) via thePolymerase Chain Reaction (PCR-fingerprinting).Different types of clonal distribution could bedistinguished: monoclonal reed stands and polyclonalreed stands, and among the latter, stands with low orhigh numbers of different clones as well as standswith mosaic-like coexisting or intermingling clones.Furthermore, clonal distribution and the expansion ofdifferent clones was observed within a newlydeveloping reed population. The findings appear tosupport a model of colonization postulating thatpopulations initiated by seeds are initiallygenetically diverse, but over time become dominated byone or a few clones adapted to the prevailing siteconditions. Thus, low genetic diversity seems to bethe result of a natural selection process. Clonaldiversity within a reed population and the type ofclonal distribution are discussed with regard to theirimportance for the reed stand's ability to adapt tochanging site conditions and eventually for itssurvival or die-back. |
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Keywords: | clonal distribution genetic diversity PCR-fingerprinting Phragmites australis RandomAmplified Polymorphic DNA (RAPD) reed population |
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