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Recent Reticulate Evolution in the Ecologically Dominant Lineage of Coccolithophores

Bendif, EM; Probert, I; Diaz-Rosas, F; Thomas, D; Van Den Engh, G; Young, JR; Von Dassow, P; (2016) Recent Reticulate Evolution in the Ecologically Dominant Lineage of Coccolithophores. Frontiers in Microbiology , 7 , Article 784. 10.3389/fmicb.2016.00784. Green open access

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Abstract

The coccolithophore family Noëlaerhabdaceae contains a number of taxa that are very abundant in modern oceans, including the cosmopolitan bloom-forming Emiliania huxleyi. Introgressive hybridization has been suggested to account for incongruences between nuclear, mitochondrial and plastidial phylogenies of morphospecies within this lineage, but the number of species cultured to date remains rather limited. Here, we present the characterization of 5 new Noëlaerhabdaceae culture strains isolated from samples collected in the south-east Pacific Ocean. These were analyzed morphologically using scanning electron microscopy and phylogenetically by sequencing 5 marker genes (nuclear 18S and 28S rDNA, plastidial tufA, and mitochondrial cox1 and cox3 genes). Morphologically, one of these strains corresponded to Gephyrocapsa ericsonii and the four others to Reticulofenestra parvula. Ribosomal gene sequences were near identical between these new strains, but divergent from G. oceanica, G. muellerae, and E. huxleyi. In contrast to the clear distinction in ribosomal phylogenies, sequences from other genomic compartments clustered with those of E. huxleyi strains with which they share an ecological range (i.e., warm temperate to tropical waters). These data provide strong support for the hypothesis of past (and potentially ongoing) introgressive hybridization within this ecologically important lineage and for the transfer of R. parvula to Gephyrocapsa. These results have important implications for understanding the role of hybridization in speciation in vast ocean meta-populations of phytoplankton.

Type: Article
Title: Recent Reticulate Evolution in the Ecologically Dominant Lineage of Coccolithophores
Open access status: An open access version is available from UCL Discovery
DOI: 10.3389/fmicb.2016.00784
Publisher version: http://doi.org/10.3389/fmicb.2016.00784
Language: English
Additional information: Copyright © 2016 Bendif, Probert, Díaz-Rosas, Thomas, van den Engh, Young and von Dassow. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
Keywords: coccolithophores, cyto-nuclear discordance, Emiliania, evolution, Gephyrocapsa, introgressive hybridization, diversity, Reticulofenestra
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Earth Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/1509447
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