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Marine Biology

, Volume 136, Issue 5, pp 829–836 | Cite as

Genetic variation in Symbiodinium isolates from giant clams based on random-amplified-polymorphic DNA (RAPD) patterns

  • B. K. Baillie
  • C. A. Belda-Baillie
  • V. Silvestre
  • M. Sison
  • A. V. Gomez
  • E. D. Gomez
  • V. Monje

Abstract

We have compared the random-amplified-polymorphic DNA (RAPD) patterns of Symbiodinium isolates from seven species of giant clams to investigate the large genetic variation that we previously reported for this group of dinoflagellate symbionts using allozyme analysis. Comparisons of 163 RAPD characters by unweighted pair-group arithmetic-average cluster analysis (UPGMA) corroborate our previous findings that giant clams associate with a large number of genetically distinguishable algal symbionts, and that the isolates from a single Tridacna gigas individual form a group of closely related algae. However, the overall topology of the UPGMA tree constructed from RAPD data differs from that of the previous allozyme data, indicating that the combined data we have collected to date are insufficient to accurately infer phylogenetic affiliations between the isolates studied. Comparisons of our data set with those published for strains of Gymnodinium catenatum, a toxic dinoflagellate with a sexual life stage, shows that our isolates are even more diverse. Algal isolates from giant clams have a level of RAPD variation comparable to organisms that are able to undergo sexual recombination. This study demonstrates the sensitivity of the RAPD technique in detecting genetic diversity in this group of algae, and highlights the need for more comparative data for the major clades of Symbiodinium.

Keywords

Dinoflagellate Sexual Life Major Clade Individual Form Phylogenetic Affiliation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2000

Authors and Affiliations

  • B. K. Baillie
    • 1
  • C. A. Belda-Baillie
    • 1
  • V. Silvestre
    • 1
  • M. Sison
    • 1
  • A. V. Gomez
    • 1
  • E. D. Gomez
    • 1
  • V. Monje
    • 2
  1. 1.Marine Science Institute, University of the Philippines, P.O. Box 1, Diliman, Quezon City 1101, PhilippinesPH
  2. 2.National Institute of Molecular Biology & Biotechnology, University of the Philippines, P.O. Box 1, Diliman, Quezon City 1101, PhilippinesPH

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