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Coral Reefs

, Volume 34, Issue 3, pp 927–939 | Cite as

Genetic diversity of free-living Symbiodinium in the Caribbean: the importance of habitats and seasons

  • Camila Granados-Cifuentes
  • Joseph Neigel
  • Paul Leberg
  • Mauricio Rodriguez-Lanetty
Report

Abstract

Although reef corals are dependent of the dinoflagellate Symbiodinium, the large majority of corals spawn gametes that do not contain their vital symbiont. This suggests the existence of a pool of Symbiodinium in the environment, of which surprisingly little is known. Reefs around Curaçao (Caribbean) were sampled for free-living Symbiodinium at three time periods (summer 2009, summer 2010, and winter 2010) to characterize different habitats (water column, coral rubble, sediment, the macroalgae Halimeda spp., Dictyota spp., and Lobophora variegata, and the seagrass Thalassia testudinum) that could serve as environmental sources of symbionts for corals. We detected the common clades of Symbiodinium that engage in symbiosis with Caribbean coral hosts A, B, and C using Symbiodinium-specific primers of the hypervariable region of the chloroplast 23S ribosomal DNA gene. We also discovered clade G and, for the first time in the Caribbean, the presence of free-living Symbiodinium clades F and H. Additionally, this study expands the habitat range of free-living Symbiodinium as environmental Symbiodinium was detected in T. testudinum seagrass beds. The patterns of association between free-living Symbiodinium types and habitats were shown to be complex. An interesting, strong association was seen between some clade A sequence types and sediment, suggesting that sediment could be a niche where clade A radiated from a free-living ancestor. Other interesting relationships were seen between sequence types of Symbiodinium clade C with Halimeda spp. and clades B and F with T. testudinium. These relationships highlight the importance of some macroalgae and seagrasses in hosting free-living Symbiodinium. Finally, studies spanning beyond a 1-yr cycle are needed to further expand on our results in order to better understand the variation of Symbiodinium in the environment through time. All together, results presented here showed that the great diversity of free-living Symbiodinium has a dynamic distribution across habitats and time.

Keywords

Free-living Symbiodinium cpr23S-HVR Thalassia testudinum Coral reefs Macroalgae Log-linear modeling analysis 

Notes

Acknowledgments

We would like to thank Dr. Mark Vermeij and Mr. Nelson Manrique for their assistance in Curacao and Mr. Venkatesh M Thirumal, Ms. Meagan D Bahlinger, Ms. Lisa Sherrif, and Mr. Jesse Soleau for their assistance in the laboratory. We would also like to thank Dr. Anthony J. Bellantuono, Ms. Tanya Brown, Ms. Ariane Martin, other members of IMaGeS Lab, and two anonymous reviewers for reviewing previous drafts of this manuscript. This research was funded by a PADI Grant awarded to CGC and an NSF-OCE Grant (0851123) awarded to MRL.

Supplementary material

338_2015_1291_MOESM1_ESM.doc (436 kb)
Supplementary material 1 (DOC 436 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Camila Granados-Cifuentes
    • 2
    • 3
  • Joseph Neigel
    • 2
  • Paul Leberg
    • 2
  • Mauricio Rodriguez-Lanetty
    • 1
  1. 1.Department of Biological SciencesFlorida International UniversityMiamiUSA
  2. 2.Department of BiologyUniversity of Louisiana at LafayetteLafayetteUSA
  3. 3.Department of Natural Sciences, Baruch CollegeCity University of New YorkNew YorkUSA

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