Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon
Usnea species of the Neuropogon group are amongst the most widespread and abundant macrolichens in Antarctic regions. Four principal species, U. antarctica, U. aurantiaco-atra, U. sphacelata and U. subantarctica , have been described on morphological grounds. However, identification to species level...
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crcambridgeupr:10.1017/s0954102007000107 2024-03-03T08:37:50+00:00 Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon Seymour, Fabian A. Crittenden, Peter D. Wirtz, Nora Øvstedal, Dag O. Dyer, Paul S. Lumbsch, H. Thorsten 2007 http://dx.doi.org/10.1017/s0954102007000107 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000107 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 19, issue 1, page 71-82 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2007 crcambridgeupr https://doi.org/10.1017/s0954102007000107 2024-02-08T08:43:45Z Usnea species of the Neuropogon group are amongst the most widespread and abundant macrolichens in Antarctic regions. Four principal species, U. antarctica, U. aurantiaco-atra, U. sphacelata and U. subantarctica , have been described on morphological grounds. However, identification to species level is often difficult and atypical morphologies frequently arise. Over 400 specimens were collected on the Antarctic Peninsula and Falkland Islands. Both morphological and molecular characters (ITS and RPB1 ) were used to compare samples to clarify taxonomic relationships. Morphological characteristics used included presence of apothecia, apothecial rays, soredia, papillae, fibrils, pigmentation and the diameter of the central axis as a proportion of branch diameter. Results revealed a very close relationship between U. antarctica and U. aurantiaco-atra , suggesting that they might constitute a species pair or be conspecific. Usnea sphacelata was comprised of at least two genetically distinct groups with no clear differences in morphology. One group included the first reported fertile specimen of this species. Usnea subantarctica was phylogenetically distinct from the other main Antarctic Usnea species, but clustered with U. trachycarpa . Genetic variation was evident within all species although there was no clear correlation between geographic origin and genetic relatedness. Phylogenetic analyses indicated that species circumscription in the Neuropogon group needs revision, with the principal species being non-monophyletic. None of the morphological characters, or groups of characters, used in this study proved to be completely unambiguous markers for a single species. However, axis thickness was supported as being informative for the identification of monophyletic lineages within the group. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica Cambridge University Press Antarctic The Antarctic Antarctic Peninsula Antarctic Science 19 1 71 82 |
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Cambridge University Press |
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English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Seymour, Fabian A. Crittenden, Peter D. Wirtz, Nora Øvstedal, Dag O. Dyer, Paul S. Lumbsch, H. Thorsten Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Usnea species of the Neuropogon group are amongst the most widespread and abundant macrolichens in Antarctic regions. Four principal species, U. antarctica, U. aurantiaco-atra, U. sphacelata and U. subantarctica , have been described on morphological grounds. However, identification to species level is often difficult and atypical morphologies frequently arise. Over 400 specimens were collected on the Antarctic Peninsula and Falkland Islands. Both morphological and molecular characters (ITS and RPB1 ) were used to compare samples to clarify taxonomic relationships. Morphological characteristics used included presence of apothecia, apothecial rays, soredia, papillae, fibrils, pigmentation and the diameter of the central axis as a proportion of branch diameter. Results revealed a very close relationship between U. antarctica and U. aurantiaco-atra , suggesting that they might constitute a species pair or be conspecific. Usnea sphacelata was comprised of at least two genetically distinct groups with no clear differences in morphology. One group included the first reported fertile specimen of this species. Usnea subantarctica was phylogenetically distinct from the other main Antarctic Usnea species, but clustered with U. trachycarpa . Genetic variation was evident within all species although there was no clear correlation between geographic origin and genetic relatedness. Phylogenetic analyses indicated that species circumscription in the Neuropogon group needs revision, with the principal species being non-monophyletic. None of the morphological characters, or groups of characters, used in this study proved to be completely unambiguous markers for a single species. However, axis thickness was supported as being informative for the identification of monophyletic lineages within the group. |
format |
Article in Journal/Newspaper |
author |
Seymour, Fabian A. Crittenden, Peter D. Wirtz, Nora Øvstedal, Dag O. Dyer, Paul S. Lumbsch, H. Thorsten |
author_facet |
Seymour, Fabian A. Crittenden, Peter D. Wirtz, Nora Øvstedal, Dag O. Dyer, Paul S. Lumbsch, H. Thorsten |
author_sort |
Seymour, Fabian A. |
title |
Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
title_short |
Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
title_full |
Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
title_fullStr |
Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
title_full_unstemmed |
Phylogenetic and morphological analysis of Antarctic lichen-forming Usnea species in the group Neuropogon |
title_sort |
phylogenetic and morphological analysis of antarctic lichen-forming usnea species in the group neuropogon |
publisher |
Cambridge University Press (CUP) |
publishDate |
2007 |
url |
http://dx.doi.org/10.1017/s0954102007000107 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102007000107 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctic Science Antarctica |
op_source |
Antarctic Science volume 19, issue 1, page 71-82 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102007000107 |
container_title |
Antarctic Science |
container_volume |
19 |
container_issue |
1 |
container_start_page |
71 |
op_container_end_page |
82 |
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1792501970166087680 |