An update on the indigenous vascular flora of sub-Antarctic Marion Island: taxonomic changes, sequences for DNA barcode
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ORIGINAL PAPER
An update on the indigenous vascular flora of sub‑Antarctic Marion Island: taxonomic changes, sequences for DNA barcode loci, and genome size data John H. Chau1 · Nasipi I. S. Mtsi2 · Zuzana Münbergová3,4 · Michelle Greve5 · Peter C. le Roux5 · Mario Mairal6 · Johannes J. Le Roux7 · Rosemary A. Dorrington2 · Bettine Jansen van Vuuren1 Received: 12 December 2019 / Revised: 6 September 2020 / Accepted: 10 September 2020 / Published online: 21 September 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The flora of sub-Antarctic Marion Island forms part of the unique South Indian Ocean Biogeographic Province, and is under threat from climate change and invasive species. Current information on the flora is necessary to rapidly identify and manage future changes. We conducted a literature search on the taxonomy of indigenous vascular plant species on Marion Island and found nomenclatural changes following taxonomic revisions for Austroblechnum penna-marina (Poir.) Gasper & V.A.O.Dittrich, Carex dikei (Nelmes) K.L.Wilson, Leptinella plumosa Hook.f., Notogrammitis crassior (Kirk) Parris, Phlegmariurus saururus (Lam.) B.Øllg., and Polypogon magellanicus (Lam.) Finot. Additionally, Ranunculus moseleyi Hook.f. was removed from our species checklist due to its long absence in floristic surveys, leaving 21 species in the indigenous vascular plant flora present on Marion Island. We also amplified and sequenced the universal plant barcoding loci rbcL and matK for 19 and 13 species, respectively, and found that ample interspecific genetic distance and minimal intraspecific genetic distance allowed for easy discrimination between species. Lastly, we obtained genome size estimates using flow cytometry for 12 species. Mean 2C genome size for species on Marion Island ranged from 0.44 to 21.44 pg, which is on the lower end of the known range for vascular plant species. We detected two distinct cytotypes in Poa cookii (Hook.f.) Hook.f. and one cytotype in all other species measured. Keywords C-value · Flow cytometry · matK · Nomenclature · Prince Edward islands · rbcL
Introduction The sub-Antarctic terrestrial bioregion comprises a small number of islands located within the vast Southern Ocean surrounding Antarctica. The flora on these islands is Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00300-020-02747-7) contains supplementary material, which is available to authorized users. * Bettine Jansen van Vuuren [email protected] 1
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Department of Zoology, Centre for Ecological Genomics and Wildlife Conservation, University of Johannesburg, Auckland Park 2006, South Africa Department of Biochemistry and Microbiology, Rhodes University, PO Box 94, Grahamstown 6140, South Africa Department of Botany, Faculty of Science, Charles University, 128 01, Prague, Czech Republic
relatively species-poor, filtered by harsh environmental conditions including cool, wet, and windy climates, and geographic isolation which necessita
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