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Journal Article

Phylotranscriptomics reveals the reticulate evolutionary history of a widespread diatom species complex

Authors
/persons/resource/ozan

Ciftci,  Ozan
0 Pre-GFZ, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Alverson,  Andrew J.
External Organizations;

van Bodegom,  Peter
External Organizations;

Roberts,  Wade R.
External Organizations;

Mertens,  Adrienne
External Organizations;

Van de Vijver,  Bart
External Organizations;

Trobajo,  Rosa
External Organizations;

Mann,  David G.
External Organizations;

Pirovano,  Walter
External Organizations;

van Eijk,  Iris
External Organizations;

Gravendeel,  Barbara
External Organizations;

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Citation

Ciftci, O., Alverson, A. J., van Bodegom, P., Roberts, W. R., Mertens, A., Van de Vijver, B., Trobajo, R., Mann, D. G., Pirovano, W., van Eijk, I., Gravendeel, B. (2022): Phylotranscriptomics reveals the reticulate evolutionary history of a widespread diatom species complex. - Journal of Phycology, 58, 5, 643-656.
https://doi.org/10.1111/jpy.13281


Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5014025
Abstract
In contrast to surveys based on a few genes that often provide limited taxonomic resolution, transcriptomes provide a wealth of genomic loci that can resolve relationships among taxonomically challenging lineages. Diatoms are a diverse group of aquatic microalgae that includes important bioindicator species and many such lineages. One example is Nitzschia palea, a widespread species complex with several morphologically defined taxonomic varieties, some of which are critical pollution indicators. Morphological differences among the varieties are subtle and phylogenetic studies based on a few genes fail to resolve their evolutionary relationships. We conducted morphometric and transcriptome analyses of 10 Nitzschia palea strains to resolve the relationships among strains and taxonomic varieties. Nitzschia palea was resolved into three clades, one of which corresponds to a group of strains with narrow linear-lanceolate valves. The other morphological group recovered in the shape outline analysis was not monophyletic and consisted of two clades. Gene-tree concordance analyses and phylogenetic network estimations revealed patterns of incomplete lineage sorting and gene flow between intraspecific lineages. We detected reticulated evolutionary patterns among lineages with different morphologies, resulting in a putative recent hybrid. Our study shows that phylogenomic analyses of unlinked nuclear loci, complemented with morphometrics, can resolve complex evolutionary histories of recently diverged species complexes.