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Title

Delineating closely related dinoflagellate lineages using phylotranscriptomics

AuthorsAnnenkova, Nataliia V.; Ahrén, Dag; Logares, Ramiro ; Kremp, Anke; Rengefors, Karin
KeywordsInternal transcribed spacer-2
ITS2
Cytochrome b
COB
Bootstrap support
BS
Protists
Adaptive radiation
Transcriptome
Phylogenomics
Microalgae
High Throughput Sequencing
Issue DateAug-2018
PublisherPhycological Society of America
CitationJournal of Phycology 54(4): 571-576 (2018)
AbstractRecently radiated dinoflagellates Apocalathium aciculiferum (collected in Lake Erken, Sweden), Apocalathium malmogiense (Baltic Sea) and Apocalathium aff. malmogiense (Highway Lake, Antarctica) represent a lineage with an unresolved phylogeny. We determined their phylogenetic relationships using phylotranscriptomics based on 792 amino acid sequences. Our results showed that A. aciculiferum diverged from the other two closely related lineages, consistent with their different morphologies in cell size, relative cell length and presence of spines. We hypothesized that A. aff. malmogiense and A. malmogiense, which inhabit different hemispheres, are evolutionarily more closely related because they diverged from a marine common ancestor, adapting to a wide salinity range, while A. aciculiferum colonized a freshwater habitat, by acquiring adaptations to this environment, in particular, salinity intolerance. We show that phylotranscriptomics can resolve the phylogeny of recently diverged protists. This has broad relevance, given that many phytoplankton species are morphologically very similar, and single genes sometimes lack the information to determine species’ relationships
Description6 pages, 2 figures, supporting information https://doi.org/10.1111/jpy.12748
Publisher version (URL)https://doi.org/10.1111/jpy.12748
URIhttp://hdl.handle.net/10261/169795
Identifiersdoi: 10.1111/jpy.12748
issn: 0022-3646
e-issn: 1529-8817
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