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  Genetic sub-structure and intermediate optimal outcrossing distance in the marine angiosperm Zostera marina

Billingham, M. R., Simões, T., Reusch, T. B. H., & Serrão, E. A. (2007). Genetic sub-structure and intermediate optimal outcrossing distance in the marine angiosperm Zostera marina. Marine Biology, 152(4), 793-801. doi:10.1007/s00227-007-0730-0.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D75B-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-000F-D75C-B
Genre: Journal Article

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billingham_2007.pdf (Publisher version), 638KB
 
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Billingham, Martin R., Author
Simões, Tiago, Author
Reusch, Thorsten B. H.1, 2, Author              
Serrão, Ester A., 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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 Abstract: The spatial distribution of genetic variability depends on the spatial patterns of clonal and sexual reproduction, gene flow, genetic drift and natural selection. Species with restricted dispersal may exhibit genetic structuring within populations with immediate neighbours being close relatives, and may show differentiation among populations. Genetic structuring of a species may have important genetic, evolutionary and ecological consequences including distance-dependent mating success. In this study we used microsatellite markers to show that clones of Zostera marina in a population in the Ria Formosa, Portugal, were aggregated and covered distances of up to 3-4 m. Clones within 4 m of each other exhibited significant and positive coancestry values, reflecting the limited seed dispersal of this species. Hand-pollinations between near (0-10.9 m), intermediate (11-32 m) and far (15 km) individuals resulted in similar levels of seed set, although the near pollinations had higher, although not statistically significant, levels of seed abortion during maturation. Seeds from intermediate-distance pollinations had a significantly higher proportion of seeds germinate and shorter germination time than both the near and far seeds. Similarly, the average number of seedlings produced per pollination, used as an overall estimate of fitness, was significantly greater for the intermediate distance when compared to both near and far pollinations. These results suggest that the genetic structuring observed may result in both inbreeding and outbreeding depression, which gives rise to an intermediate optimal outcrossing distance.

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Language(s): eng - English
 Dates: 2007-09
 Publication Status: Published in print
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 Identifiers: eDoc: 321529
DOI: 10.1007/s00227-007-0730-0
Other: 2566/S 38719
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Title: Marine Biology
  Alternative Title : Mar Biol
Source Genre: Journal
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Pages: - Volume / Issue: 152 (4) Sequence Number: - Start / End Page: 793 - 801 Identifier: ISSN: 0025-3162