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One-year survey of a single Micronesian reef reveals extraordinarily rich diversity of Symbiodinium types in soritid foraminifera

Pochon, X. ; Garcia-Cuetos, L. ; Baker, A. ; Castella, E. ; Pawlowski, J.

In: Coral Reefs, 2007, vol. 26, no. 4, p. 867-882

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    Titre
    • One-year survey of a single Micronesian reef reveals extraordinarily rich diversity of Symbiodinium types in soritid foraminifera
    Auteur
    • Pochon, X.. Department of Zoology and Animal Biology, Molecular Systematics Group, University of Geneva, 30 quai Ernest Ansermet, 1211, Geneva 4, Switzerland
    • Garcia-Cuetos, L.. Department of Zoology and Animal Biology, Molecular Systematics Group, University of Geneva, 30 quai Ernest Ansermet, 1211, Geneva 4, Switzerland
    • Baker, A.. Division of Marine Biology and Fisheries, Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Cswy, 33149, Miami, FL, USA
    • Castella, E.. Laboratory of Ecology and Aquatic Biology, University of Geneva, 18 ch. des Clochettes, 1206, Geneva, Switzerland
    • Pawlowski, J.. Department of Zoology and Animal Biology, Molecular Systematics Group, University of Geneva, 30 quai Ernest Ansermet, 1211, Geneva 4, Switzerland
    Type de document
    • Postprint
    Identifiant OAI-PMH
    • oai:doc.rero.ch:320001
    Summary
    Recent molecular studies of symbiotic dinoflagellates (genus Symbiodinium) from a wide array of invertebrate hosts have revealed exceptional fine-scale symbiont diversity whose distribution among hosts, regions and environments exhibits significant biogeographic, ecological and evolutionary patterns. Here, similar molecular approaches using the internal transcribed spacer-2 (ITS-2) region were applied to investigate cryptic diversity in Symbiodinium inhabiting soritid foraminifera. Approximately 1,000 soritid specimens were collected and examined during a 12-month period over a 40m depth gradient from a single reef in Guam, Micronesia. Out of 61 ITS-2 types distinguished, 46 were novel. Most types found are specific for soritid hosts, except for three types (C1, C15 and C19) that are common in metazoan hosts. The distribution of these symbionts was compared with the phylotype of their foraminiferal hosts, based on soritid small subunit ribosomal DNA sequences, and three new phylotypes of soritid hosts were identified based on these sequences. Phylogenetic analyses of 645 host-symbiont pairings revealed that most Symbiodinium types associated specifically with a particular foraminiferal host genus or species, and that the genetic diversity of these symbiont types was positively correlated with the genetic diversity found within each of the three host genera. Compared to previous molecular studies of Symbiodinium from other locations worldwide, the diversity reported here is exceptional and suggests that Micronesian coral reefs are home to a remarkably large Symbiodinium assemblage