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Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)

Collodaria are the only group of Radiolaria that has a colonial lifestyle. This group is potentially the most important plankton in the oligotrophic ocean because of its large biomass and the high primary productivity associated with the numerous symbionts inside a cell or colony. The evolution of C...

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Autores principales: Ishitani, Yoshiyuki, Ujiié, Yurika, de Vargas, Colomban, Not, Fabrice, Takahashi, Kozo
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2012
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342292/
https://www.ncbi.nlm.nih.gov/pubmed/22567112
http://dx.doi.org/10.1371/journal.pone.0035775
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author Ishitani, Yoshiyuki
Ujiié, Yurika
de Vargas, Colomban
Not, Fabrice
Takahashi, Kozo
author_facet Ishitani, Yoshiyuki
Ujiié, Yurika
de Vargas, Colomban
Not, Fabrice
Takahashi, Kozo
author_sort Ishitani, Yoshiyuki
collection PubMed
description Collodaria are the only group of Radiolaria that has a colonial lifestyle. This group is potentially the most important plankton in the oligotrophic ocean because of its large biomass and the high primary productivity associated with the numerous symbionts inside a cell or colony. The evolution of Collodaria could thus be related to the changes in paleo-productivity that have affected organic carbon fixation in the oligotrophic ocean. However, the fossil record of Collodaria is insufficient to trace their abundance through geological time, because most collodarians do not have silicified shells. Recently, molecular phylogeny based on nuclear small sub-unit ribosomal DNA (SSU rDNA) confirmed Collodaria to be one of five orders of Radiolaria, though the relationship among collodarians is still unresolved because of inadequate taxonomic sampling. Our phylogenetic analysis has revealed four novel collodarian sequences, on the basis of which collodarians can be divided into four clades that correspond to taxonomic grouping at the family level: Thalassicollidae, Collozoidae, Collosphaeridae, and Collophidae. Comparison of the results of our phylogenetic analyses with the morphological characteristics of each collodarian family suggests that the first ancestral collodarians had a solitary lifestyle and left no silica deposits. The timing of events estimated from molecular divergence calculations indicates that naked collodarian lineages first appeared around 45.6 million years (Ma) ago, coincident with the diversification of diatoms in the pelagic oceans. Colonial collodarians appeared after the formation of the present ocean circulation system and the development of oligotrophic conditions in the equatorial Pacific (ca. 33.4 Ma ago). The divergence of colonial collodarians probably caused a shift in the efficiency of primary production during this period.
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spelling pubmed-33422922012-05-07 Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria) Ishitani, Yoshiyuki Ujiié, Yurika de Vargas, Colomban Not, Fabrice Takahashi, Kozo PLoS One Research Article Collodaria are the only group of Radiolaria that has a colonial lifestyle. This group is potentially the most important plankton in the oligotrophic ocean because of its large biomass and the high primary productivity associated with the numerous symbionts inside a cell or colony. The evolution of Collodaria could thus be related to the changes in paleo-productivity that have affected organic carbon fixation in the oligotrophic ocean. However, the fossil record of Collodaria is insufficient to trace their abundance through geological time, because most collodarians do not have silicified shells. Recently, molecular phylogeny based on nuclear small sub-unit ribosomal DNA (SSU rDNA) confirmed Collodaria to be one of five orders of Radiolaria, though the relationship among collodarians is still unresolved because of inadequate taxonomic sampling. Our phylogenetic analysis has revealed four novel collodarian sequences, on the basis of which collodarians can be divided into four clades that correspond to taxonomic grouping at the family level: Thalassicollidae, Collozoidae, Collosphaeridae, and Collophidae. Comparison of the results of our phylogenetic analyses with the morphological characteristics of each collodarian family suggests that the first ancestral collodarians had a solitary lifestyle and left no silica deposits. The timing of events estimated from molecular divergence calculations indicates that naked collodarian lineages first appeared around 45.6 million years (Ma) ago, coincident with the diversification of diatoms in the pelagic oceans. Colonial collodarians appeared after the formation of the present ocean circulation system and the development of oligotrophic conditions in the equatorial Pacific (ca. 33.4 Ma ago). The divergence of colonial collodarians probably caused a shift in the efficiency of primary production during this period. Public Library of Science 2012-05-02 /pmc/articles/PMC3342292/ /pubmed/22567112 http://dx.doi.org/10.1371/journal.pone.0035775 Text en Ishitani et al. http://creativecommons.org/licenses/by/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.
spellingShingle Research Article
Ishitani, Yoshiyuki
Ujiié, Yurika
de Vargas, Colomban
Not, Fabrice
Takahashi, Kozo
Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title_full Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title_fullStr Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title_full_unstemmed Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title_short Phylogenetic Relationships and Evolutionary Patterns of the Order Collodaria (Radiolaria)
title_sort phylogenetic relationships and evolutionary patterns of the order collodaria (radiolaria)
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342292/
https://www.ncbi.nlm.nih.gov/pubmed/22567112
http://dx.doi.org/10.1371/journal.pone.0035775
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