Skip to main content

Genetic structure of natural populations of Gelidium species: A re-evaluation of results

Abstract

Twenty-two loci were re-evaluated to assess genetic variation and differentiation in three natural populations (two from Gran Canaria and one from Tenerife) of Gelidium (G. canariensis and G. arbuscula). The new data using exclusively the diploid subpopulation gene frequencies confirm that dispersal was restricted over short distances for the two species, but contrary to previous conclusions, the data reveal that these two closely related species differed markedly by their mating systems and patterns of genetic differentiation. Genetic differentiation among populations was twice as high in G. arbuscula as in G. canariensis. It was confirmed that the mean way of reproduction is asexual in G. arbuscula and a discussion included as to how clonal propagation may explain the difference in haploid and diploid allele frequencies in this species. There was no evidence for asexual reproduction in G. canariensis. Heterozygote deficiency could be explained simply by spatial sub-structuring within populations. The importance of the sampling design in determining the level and pattern of genetic differentiation within a species is discussed.

This is a preview of subscription content, access via your institution.

References

  1. Benzie JAH, Price IR, Ballment E (1997) Population genetics and taxonomy of Caulerpa (Chlorophyta) from the great barrier reef, Australia. J. Phycol. 33: 491-504.

    Article  Google Scholar 

  2. Cheney DP, Babbel GR (1978) Biosystematic studies of the red algal genus Eucheuma. 1. Electrophoretic variation among Florida populations. Mar. Biol. 47: 251-264.

    Article  Google Scholar 

  3. Coyer JA, Robertson DL, Alberte RS (1994) Genetic variability within a population and between diploid/haploid tissue of Macrocystis pyrifera (Phaeophyta). J. Phycol. 30: 545-552.

    Article  Google Scholar 

  4. Fujio Y, Kodaka PL, Hara M (1985) Genetic differentiation and amount of genetic variability in natural populations of the haploid laver Porphyra yezoensis. Jap. J. Genet. 60: 347-354.

    Google Scholar 

  5. Goudet J (1995) Fstat Version 1.2. A computer program to calculate F-statistics. J. Hered. 86: 485-486.

    Google Scholar 

  6. Goudet J, De Meeüs T, Day AJ, Gliddon C (1994) The different levels of population structuring of dogwhelks, Nucella lapillus, along the south Devon coast. In Beaumont A (ed.), Genetics and Evolution of Aquatic Organisms. Chapman & Hall, London, UK 81-95.

    Google Scholar 

  7. Lewis PO, Zaykin D (1997) Genetic Data Analysis: Computer program for the analysis of allelic data. Version 1.0. Free program distributed by the authors over the internet from the GDA Home Page at http://chee.unm.edu/gda/software.

  8. Lindstrom SC (1993) Inter-and intrapopulation genetic variation in species of Porphyra(Rhodophyta: Bangiales) from British Columbia and adjacent waters. J. appl. Phycol. 5: 53-62.

    Article  Google Scholar 

  9. Lu TT, Williams SL (1994) Genetic diversity and genetic structure in the brown alga Halidrys dioica(Fucales: Cystoseiraceae) in southern california. Mar. Biol. 121: 363-371.

    Article  Google Scholar 

  10. Nei M (1978) Estimation of average heterozygosity and genetic distance from a small number of individuals. Genetics 89: 583-590.

    Google Scholar 

  11. Raymond M, Rousset F (1995) GENEPOP (version 1.2): population genetics software for exact tests and eucumenism. J. Hered. 86: 248-249.

    Google Scholar 

  12. Rousset F, Raymond M (1997) Statistical analyses of population genetic data: new tools, old concepts. Trends Ecol. Evol. 12: 313-317.

    Article  Google Scholar 

  13. Sosa PA, Garcia-Reina G (1992) Genetic variability and differentiation of sporophytes and gametophytes in populations of Gelidiutn arbuscula (Gelidiaceae: Rhodophyta) determined by isozyme electrophoresis. Mar. Biol. 113: 679-688.

    CAS  Article  Google Scholar 

  14. Sosa PA, Garcia-Reina G (1993) Genetic variability of Gelidium canariensis(Rhodophyta) determined by isozyme electrophoresis. J. Phycol. 29: 118-124.

    CAS  Google Scholar 

  15. Wattier R, Dallas JF, Destombe C, Saumitou Laprade P, Valero M (1997) Single locus microsatellites in Gracilariales (Rhodophyta): high level of genetic variability within Gracilaria gracilisand conservation in related species. J. Phycol. 33: 868-880.

    CAS  Article  Google Scholar 

  16. Weir BS, Cockerham CC (1984) Estimating the F-statistics for the analysis of population structure. Evolution 38: 1358-1370.

    Article  Google Scholar 

  17. Williams SL, Di Fiori RE (1996) Genetic diversity and structure in Pelvetia fastigiata(Phaeophyta: Fucales): does a small effective neighborhood size explain fine-scale genetic structure. Mar. Biol. 126: 371-382.

    CAS  Article  Google Scholar 

  18. Wright S (1965) The interpretation of population structure by F-statistics with special regard to systems of mating. Evolution 19: 395-420.

    Article  Google Scholar 

Download references

Author information

Affiliations

Authors

Rights and permissions

Reprints and Permissions

About this article

Cite this article

Sosa, P.A., Valero, M., Batista, F. et al. Genetic structure of natural populations of Gelidium species: A re-evaluation of results. Journal of Applied Phycology 10, 279–284 (1998). https://doi.org/10.1023/A:1008092023549

Download citation

  • Canary Islands
  • electrophoresis
  • F-statistics
  • Gelidium canariensis
  • Gelidium arbuscula
  • genetic distance
  • genetic structure
  • isozymes