Lithothamnion (Hapalidiales, Rhodophyta) in the changing Arctic and Subarctic: DNA sequencing of type and recent specimens provides a systematic foundation

Peña, V. et al. (2021) Lithothamnion (Hapalidiales, Rhodophyta) in the changing Arctic and Subarctic: DNA sequencing of type and recent specimens provides a systematic foundation. European Journal of Phycology, 56(4), pp. 468-493. (doi: 10.1080/09670262.2021.1880643)

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Coralline red algae in the non-geniculate genera Clathromorphum, Phymatolithon and Lithothamnion are important benthic ecosystem engineers in the photic zone of the Arctic and Subarctic. In these regions, the systematics and biogeography of Clathromorphum and Phymatolithon have mostly been resolved whereas Lithothamnion has not, until now. Seventy-three specific and infraspecific names were given to Arctic and Subarctic Lithothamnion specimens in the late 19th and early 20th century by Frans R. Kjellman and Mikael H. Foslie. DNA sequences from 36 type specimens, five historical specimens, and an extensive sampling of recent collections resulted in the recognition of four Arctic and Subarctic Lithothamnion species, L. glaciale, L. lemoineae, L. soriferum and L. tophiforme. Three genes were sequenced, two plastid-encoded, rbcL and psbA, and the mitochondrial encoded COI-5P; rbcL and COI-5P segregated L. glaciale from L. tophiforme but psbA did not. Partial rbcL sequences obtained from type collections enabled us to correctly apply the earliest available names and to correctly place the remainder in synonymy. We were unable to sequence another 22 type specimens, but all of these are more recent names than those that are now applied. It is difficult to identify these species solely on morpho-anatomy as they can all occur as encrusting corallines or as maerl (rhodoliths). We demonstrate the importance of sequencing historical type specimens by showing that the recently proposed North-east Atlantic L. erinaceum is a synonym of one of the earliest published Arctic species of Lithothamnion, L. soriferum, itself incorrectly placed in synonymy under L. tophiforme based on morpho-anatomy. Based on sequenced specimens, we update the distributions and ecology of these species.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Kamenos, Professor Nick
Authors: Peña, V., Bélanger, D., Gagnon, P., Richards, J. L., Le Gall, L., Hughey, J. R., Saunders, G. W., Lindstrom, S. C., Rinde, E., Husa, V., Christie, H., Frederiksen, S., Hall-Spencer, J. M., Steneck, R. S., Schoenrock, K. M., Gitmark, J., Grefsrud, E. S., Anglés d'Auriac, M. B., Legrandi, E., Grall, J., Mumford, T. F., Kamenos, N. A., and Gabrielson, P. W.
College/School:College of Science and Engineering > School of Geographical and Earth Sciences
Journal Name:European Journal of Phycology
Publisher:Taylor & Francis
ISSN (Online):1469-4433
Published Online:16 June 2021
Copyright Holders:Copyright © 2021 British Phycological Society
First Published:First published in European Journal of Phycology 56(4): 468-493
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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