Journal
AQUATIC BOTANY
Volume 90, Issue 2, Pages 165-171Publisher
ELSEVIER
DOI: 10.1016/j.aquabot.2008.09.001
Keywords
Bayesian clustering; Genetic variation; Linear dispersal; Long-distance dispersal; Microsatellite analysis; Spatial autocorrelation
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Funding
- Czech Academy of Sciences [B6111304, AV0Z 60050516]
- Ministry of Education, Youth and Sports of the Czech Republic [0021620828]
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Even though the reed. Phragmites australis, is an extensively studied wetland species, little is known about reproduction and dispersal modes within and among reed populations at the scale of small river systems. Using microsatellite analysis of 189 individuals from three adjacent river catchments in the Czech Republic, we elucidated the role of the river corridors in the dispersal of P. australis. Using Bayesian clustering of individuals, we found that 19% of clusters were distributed only along one river, which implied dispersal by water (or by wind) along river corridors, whereas 38% of clusters were widely distributed and were likely the product of wind long-distance dispersal among rivers. Intensive exchange of propagules among river systems is further demonstrated by only 6% of total variance being attributed to the variance among rivers in the AMOVA-analysis. Spatial autocorrelation analysis revealed a decreasing pattern up to 5-10 km and no clear pattern over longer distances. This gives an evidence for pollen and seed dispersal at short distances (up to 1 km), whereas most likely only seed dispersal at longer distances up to 10 km. We found five multilocus genotypes distributed in two different populations. The distances between populations with the same genotype ranged from 0.5 to 10.8 km. This can be interpreted as long-distance vegetative dispersal. (C) 2008 Elsevier B.V. All rights reserved.
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