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  Inbreeding depression influences genet size distribution in a marine angiosperm

Hämmerli, A., & Reusch, T. B. H. (2003). Inbreeding depression influences genet size distribution in a marine angiosperm. Molecular Ecology, 12(3), 619-629.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DC0E-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-DC0F-B
Genre: Journal Article

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haemmerli_2003.pdf (Publisher version), 676KB
 
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Hämmerli, A.1, Author              
Reusch, T. B. H.1, 2, Author              
Affiliations:
1Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_976547              
2Department Evolutionary Ecology, Max Planck Institute for Evolutionary Biology, Max Planck Society, ou_1445634              

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Free keywords: clonal plant; inbreeding depression; individual heterozygosity; microsatellites; Zostera marina
 Abstract: Although inbreeding depression is a major genetic phenomena influencing individual fitness, it is difficult to measure in wild populations. An alternative approach is to correlate heterozygosity, measured using highly polymorphic markers, with a fitness-correlated trait. In clonal plants, genet size is predicted to be fitness correlated. Here we test the prediction that the genet size distribution of the marine clonal plant Zostera marina (eelgrass) is influenced by inbreeding depression. We used nine polymorphic microsatellite markers to access the fine scale clonal structure and to measure individual heterozygosity within 4 plots (each corresponds to 256 m(2) , sampled at 1-m intervals) in two populations along the German Baltic Coast. The same plots were also sampled for flowering and vegetative shoots to obtain estimates for sexual reproductive output at the level of the genetic individual. We found substantial differences in the genet size distribution between the two populations that may be explained by different disturbance frequency. In both populations, clone size was significantly positively correlated with the total number of flowering shoots, indicating that larger clones have a higher reproductive output. Individual heterozygosity was significantly positively associated with clone size. The effect was much stronger in Falkenstein (low disturbance) than in Maasholm (high disturbance). The results indicate that in a low disturbance population the relatively outbred clones occupy a higher proportion of the available space, possibly because they outcompete relatively inbred neighbours.

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Language(s): eng - English
 Dates: 2003-03
 Publication Status: Published in print
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: eDoc: 39097
ISI: 000181230900005
Other: 2164/S 37888
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Title: Molecular Ecology
  Alternative Title : Mol. Ecol.
Source Genre: Journal
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Pages: - Volume / Issue: 12 (3) Sequence Number: - Start / End Page: 619 - 629 Identifier: ISSN: 0962-1083