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

X. Pochon, L. Garcia-Cuetos, Andrew C Baker, E. Castella, J. Pawlowski

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

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 40 m 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.

Original languageEnglish
Pages (from-to)867-882
Number of pages16
JournalCoral Reefs
Volume26
Issue number4
DOIs
StatePublished - Dec 1 2007

Fingerprint

Symbiodinium
foraminifera
reefs
reef
symbiont
symbionts
internal transcribed spacers
Micronesia
Retaria
Guam
genetic variation
metazoan
ribosomal DNA
dinoflagellate
coral reefs
coral reef
invertebrate
invertebrates
phylogenetics
nucleotide sequences

Keywords

  • ITS-2 rDNA
  • Molecular diversity
  • Soritinae
  • Symbiodinium
  • Symbiosis

ASJC Scopus subject areas

  • Aquatic Science

Cite this

One-year survey of a single Micronesian reef reveals extraordinarily rich diversity of Symbiodinium types in soritid foraminifera. / Pochon, X.; Garcia-Cuetos, L.; Baker, Andrew C; Castella, E.; Pawlowski, J.

In: Coral Reefs, Vol. 26, No. 4, 01.12.2007, p. 867-882.

Research output: Contribution to journalArticle

Pochon, X. ; Garcia-Cuetos, L. ; Baker, Andrew C ; Castella, E. ; Pawlowski, J. / One-year survey of a single Micronesian reef reveals extraordinarily rich diversity of Symbiodinium types in soritid foraminifera. In: Coral Reefs. 2007 ; Vol. 26, No. 4. pp. 867-882.
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