They are young, and they are many: dating freshwater lineages in unicellular dinophytes.


Journal

Environmental microbiology
ISSN: 1462-2920
Titre abrégé: Environ Microbiol
Pays: England
ID NLM: 100883692

Informations de publication

Date de publication:
11 2019
Historique:
received: 01 03 2019
revised: 24 07 2019
accepted: 29 07 2019
pubmed: 2 8 2019
medline: 8 5 2020
entrez: 2 8 2019
Statut: ppublish

Résumé

Dinophytes are one of few protist groups that have an extensive fossil record and are therefore appropriate for time estimations. However, insufficient sequence data and strong rate heterogeneity have been hindering to put dinophyte evolution into a time frame until now. Marine-to-freshwater transitions within this group are considered geologically old and evolutionarily exceptional due to strong physiological constraints that prevent such processes. Phylogenies based on concatenated rRNA sequences (including 19 new GenBank entries) of two major dinophyte lineages, Gymnodiniaceae and Peridiniales, were carried out using an uncorrelated molecular clock and five calibration points based on fossils. Contrarily to previous assumptions, marine-to-freshwater transitions are more frequent in dinophytes (i.e. five marine-freshwater transitions in Gymnodiniaceae, up to ten but seven strongly supported transitions in Peridiniales), and none of them occurred as early as 140 MYA. Furthermore, most marine-to-freshwater transitions, and the followed diversification, took place after the Cretaceous-Paleogene boundary. Not older than 40 MYA, the youngest transitions within Gymnodiniaceae and Peridiniales occurred under the influence of the Eocene climate shift. Our evolutionary scenario indicates a gradual diversification of dinophytes without noticeable impact of catastrophic events, and their freshwater lineages have originated several times independently at different points in time.

Identifiants

pubmed: 31369197
doi: 10.1111/1462-2920.14766
doi:

Substances chimiques

RNA, Ribosomal 0

Types de publication

Journal Article Research Support, Non-U.S. Gov't

Langues

eng

Sous-ensembles de citation

IM

Pagination

4125-4135

Subventions

Organisme : Deutsche Forschungsgemeinschaft
ID : GO 1459 10-1
Pays : International

Informations de copyright

© 2019 Society for Applied Microbiology and John Wiley & Sons Ltd.

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Auteurs

Anže Žerdoner Čalasan (A)

Department Biologie/Chemie, Botanik, Universität Osnabrück, Barbarastr. 11, 49076 Osnabrück, Germany.
Department Biologie, Systematische Botanik und Mykologie, GeoBio-Center, Ludwig-Maximilians-Universität München, Menzinger Street. 67, 80638 Munich, Germany.

Juliane Kretschmann (J)

Department Biologie, Systematische Botanik und Mykologie, GeoBio-Center, Ludwig-Maximilians-Universität München, Menzinger Street. 67, 80638 Munich, Germany.

Marc Gottschling (M)

Department Biologie, Systematische Botanik und Mykologie, GeoBio-Center, Ludwig-Maximilians-Universität München, Menzinger Street. 67, 80638 Munich, Germany.

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