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Brilliantia kiribatiensis, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean

Brilliantia kiribatiensis, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean
Brilliantia kiribatiensis, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean

The marine green alga Brilliantia kiribatiensis gen. et sp. nov. is described from samples collected from the coral reefs of the Southern Line Islands, Republic of Kiribati, Pacific Ocean. Phylogenetic analysis of sequences of the large- and small-subunit rDNA and the rDNA internal transcribed spacer region revealed that Brilliantia is a member of the Boodleaceae (Cladophorales), containing the genera Apjohnia, Boodlea, Cladophoropsis, Chamaedoris, Phyllodictyon, and Struvea. Within this clade it formed a distinct lineage, sister to Struvea elegans, but more distantly related to the bona fide Struvea species (including the type S. plumosa). Brilliantia differs from the other genera by having a very simple architecture forming upright, unbranched, single-celled filaments attached to the substratum by a rhizoidal mat. Cell division occurs by segregative cell division only at the onset of reproduction. Based on current sample collection, B. kiribatiensis seems to be largely restricted to the Southern Line Islands, although it was also observed on neighboring islands, including Orona Atoll in the Phoenix Islands of Kiribati, and the Rangiroa and Takapoto Atolls in the Tuamotus of French Polynesia. This discovery highlights the likeliness that there is still much biodiversity yet to be discovered from these remote and pristine reefs of the central Pacific.

18S nuclear ribosomal DNA, Chlorophyta, Cladophorales, Siphonocladales, Ulvophyceae, molecular phylogeny
1529-8817
183-197
Leliaert, Frederik
ddf72ca7-cb19-4fcf-aaac-0bdaec503192
Kelly, Emily L. A.
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Janouškovec, Jan
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Fox, Michael D.
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Johnson, Maggie D.
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Redfern, Farran M.
6a8d001c-de03-4157-a6ff-181caa4c6106
Eria, Taati
130cd3aa-02bd-4b00-8b58-a3bb278ac7a8
Haas, Andreas F.
674738aa-c451-4000-a053-9cc2b082351b
Sala, Enric
e165f2ed-70f3-4020-ba83-70bc6ef616d0
Sandin, Stuart A.
f672f25b-59de-4215-ab30-c4ebed2686f5
Smith, Jennifer E.
e693fe11-d014-4c1a-9e2a-41dd6b074d89
Leliaert, Frederik
ddf72ca7-cb19-4fcf-aaac-0bdaec503192
Kelly, Emily L. A.
e1180225-770e-4fd2-b5c7-8966dde18aa8
Janouškovec, Jan
fbaa4a5d-872e-465b-b2c3-bb35df455cc6
Fox, Michael D.
b8956aab-4073-4e1f-b600-fd5ecb17d585
Johnson, Maggie D.
efaaf6cd-76d6-4846-9777-f2737eecbeec
Redfern, Farran M.
6a8d001c-de03-4157-a6ff-181caa4c6106
Eria, Taati
130cd3aa-02bd-4b00-8b58-a3bb278ac7a8
Haas, Andreas F.
674738aa-c451-4000-a053-9cc2b082351b
Sala, Enric
e165f2ed-70f3-4020-ba83-70bc6ef616d0
Sandin, Stuart A.
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Smith, Jennifer E.
e693fe11-d014-4c1a-9e2a-41dd6b074d89

Leliaert, Frederik, Kelly, Emily L. A., Janouškovec, Jan, Fox, Michael D., Johnson, Maggie D., Redfern, Farran M., Eria, Taati, Haas, Andreas F., Sala, Enric, Sandin, Stuart A. and Smith, Jennifer E. (2022) Brilliantia kiribatiensis, a new genus and species of Cladophorales (Chlorophyta) from the remote coral reefs of the Southern Line Islands, Pacific Ocean. Journal of Phycology, 58 (2), 183-197. (doi:10.1111/jpy.13230).

Record type: Article

Abstract

The marine green alga Brilliantia kiribatiensis gen. et sp. nov. is described from samples collected from the coral reefs of the Southern Line Islands, Republic of Kiribati, Pacific Ocean. Phylogenetic analysis of sequences of the large- and small-subunit rDNA and the rDNA internal transcribed spacer region revealed that Brilliantia is a member of the Boodleaceae (Cladophorales), containing the genera Apjohnia, Boodlea, Cladophoropsis, Chamaedoris, Phyllodictyon, and Struvea. Within this clade it formed a distinct lineage, sister to Struvea elegans, but more distantly related to the bona fide Struvea species (including the type S. plumosa). Brilliantia differs from the other genera by having a very simple architecture forming upright, unbranched, single-celled filaments attached to the substratum by a rhizoidal mat. Cell division occurs by segregative cell division only at the onset of reproduction. Based on current sample collection, B. kiribatiensis seems to be largely restricted to the Southern Line Islands, although it was also observed on neighboring islands, including Orona Atoll in the Phoenix Islands of Kiribati, and the Rangiroa and Takapoto Atolls in the Tuamotus of French Polynesia. This discovery highlights the likeliness that there is still much biodiversity yet to be discovered from these remote and pristine reefs of the central Pacific.

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Leliaert_et_al_Brilliantia - Accepted Manuscript
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Accepted/In Press date: 11 November 2021
e-pub ahead of print date: 17 January 2022
Published date: 13 April 2022
Additional Information: Funding Information: We would like to thank the captain and crew of the MV Hanse Explorer for their support on expeditions in both 2009 and 2013. The National Geographic Society funded the 2009 Pristine Seas expedition to the Southern Line Islands, and numerous private donors funded the 2013 Scripps Oceanography expedition. We would like to thank Dr. James Maragos and Dr. David Obura for being dive buddies to JES in 2009. Dr. Forest Rohwer provided invaluable insight and support with regard to sampling and molecular tools. We thank Adi Khen for the drawing of B. kiribatiensis, Dr. Michael Guiry and Dr. William Woelkerling for advice on nomenclature, and Barbara Kennedy of the Bishop Museum's Herbarium Pacificum for curating the voucher specimens. We thank the three reviewers for their valuable comments. The work performed and samples were collected under research permits from the Republic of Kiribati. Publisher Copyright: © 2021 Phycological Society of America. Copyright: Copyright 2022 Elsevier B.V., All rights reserved.
Keywords: 18S nuclear ribosomal DNA, Chlorophyta, Cladophorales, Siphonocladales, Ulvophyceae, molecular phylogeny
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Identifiers

Local EPrints ID: 476528
URI: http://eprints.soton.ac.uk/id/eprint/476528
DOI: doi:10.1111/jpy.13230
ISSN: 1529-8817
PURE UUID: fa4dac29-2b46-429c-af16-31a23caececb
ORCID for Jan Janouškovec: ORCID iD orcid.org/0000-0001-6547-749X

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Date deposited: 05 May 2023 16:30
Last modified: 17 Mar 2024 04:11

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Contributors

Author: Frederik Leliaert
Author: Emily L. A. Kelly
Author: Jan Janouškovec ORCID iD
Author: Michael D. Fox
Author: Maggie D. Johnson
Author: Farran M. Redfern
Author: Taati Eria
Author: Andreas F. Haas
Author: Enric Sala
Author: Stuart A. Sandin
Author: Jennifer E. Smith

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