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

Garcia-Cuetos, L.
Baker, A. C.
Published in Coral Reefs. 2007, vol. 26, no. 4, p. 867-882
Collection Open Access - Licence nationale Springer
Abstract Recent molecular studies of symbiotic dinoXagellates (genus Symbiodinium) from a wide array of invertebrate hosts have revealed exceptional Wne-scale symbiont diversity whose distribution among hosts, regions and environments exhibits signiWcant 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 speciWc 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 identiWed based on these sequences. Phylogenetic analyses of 645 host-symbiont pairings revealed that most Symbiodinium types associated speciWcally 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.
Keywords Molecular diversityITS-2 rDNASoritinaeSymbiodiniumSymbiosis
Full text
Research groups Ecology and Aquatic Biology
ISE Pôle Sciences
ISE Biodiversité
Project FNS: 3100A0-100415
(ISO format)
POCHON, Xavier et al. One-year survey of a single Micronesian reef reveals extraordinarily rich diversity of Symbiodinium types in soritid foraminifera. In: Coral Reefs, 2007, vol. 26, n° 4, p. 867-882. https://archive-ouverte.unige.ch/unige:26766

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Deposited on : 2013-03-13

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