Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont
Lichens, symbiotic associations of fungi (mycobionts) and green algae or cyanobacteria (photobionts), are poikilohydric organisms that are particularly well adapted to withstand adverse environmental conditions. Terrestrial ecosystems of the Antarctic are therefore largely dominated by lichens. The...
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Norwegian Polar Institute
2012
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Online Access: | https://doi.org/10.3402/polar.v31i0.17353 https://doaj.org/article/2b5b9e93e7324dd68c916a7273378449 |
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ftdoajarticles:oai:doaj.org/article:2b5b9e93e7324dd68c916a7273378449 2023-05-15T13:49:31+02:00 Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont Stephanie Domaschke Fernando Fernández-Mendoza Miguel A. García María P. Martín Christian Printzen 2012-03-01T00:00:00Z https://doi.org/10.3402/polar.v31i0.17353 https://doaj.org/article/2b5b9e93e7324dd68c916a7273378449 EN eng Norwegian Polar Institute http://www.polarresearch.net/index.php/polar/article/view/17353/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v31i0.17353 0800-0395 1751-8369 https://doaj.org/article/2b5b9e93e7324dd68c916a7273378449 Polar Research, Vol 31, Iss 0, Pp 1-13 (2012) Genetic diversity lichens Cetraria aculeata Trebouxia jamesii polar lichens global change Environmental sciences GE1-350 Oceanography GC1-1581 article 2012 ftdoajarticles https://doi.org/10.3402/polar.v31i0.17353 2022-12-31T11:43:08Z Lichens, symbiotic associations of fungi (mycobionts) and green algae or cyanobacteria (photobionts), are poikilohydric organisms that are particularly well adapted to withstand adverse environmental conditions. Terrestrial ecosystems of the Antarctic are therefore largely dominated by lichens. The effects of global climate change are especially pronounced in the maritime Antarctic and it may be assumed that the lichen vegetation will profoundly change in the future. The genetic diversity of populations is closely correlated to their ability to adapt to changing environmental conditions and to their future evolutionary potential. In this study, we present evidence for low genetic diversity in Antarctic mycobiont and photobiont populations of the widespread lichen Cetraria aculeata. We compared between 110 and 219 DNA sequences from each of three gene loci for each symbiont. A total of 222 individuals from three Antarctic and nine antiboreal, temperate and Arctic populations were investigated. The mycobiont diversity is highest in Arctic populations, while the photobionts are most diverse in temperate regions. Photobiont diversity decreases significantly towards the Antarctic but less markedly towards the Arctic, indicating that ecological factors play a minor role in determining the diversity of Antarctic photobiont populations. Richness estimators calculated for the four geographical regions suggest that the low genetic diversity of Antarctic populations is not a sampling artefact. Cetraria aculeata appears to have diversified in the Arctic and subsequently expanded its range into the Southern Hemisphere. The reduced genetic diversity in the Antarctic is most likely due to founder effects during long-distance colonization. Article in Journal/Newspaper Antarc* Antarctic Arctic Climate change Polar Research Directory of Open Access Journals: DOAJ Articles Arctic Antarctic The Antarctic Polar Research 31 1 17353 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Genetic diversity lichens Cetraria aculeata Trebouxia jamesii polar lichens global change Environmental sciences GE1-350 Oceanography GC1-1581 |
spellingShingle |
Genetic diversity lichens Cetraria aculeata Trebouxia jamesii polar lichens global change Environmental sciences GE1-350 Oceanography GC1-1581 Stephanie Domaschke Fernando Fernández-Mendoza Miguel A. García María P. Martín Christian Printzen Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
topic_facet |
Genetic diversity lichens Cetraria aculeata Trebouxia jamesii polar lichens global change Environmental sciences GE1-350 Oceanography GC1-1581 |
description |
Lichens, symbiotic associations of fungi (mycobionts) and green algae or cyanobacteria (photobionts), are poikilohydric organisms that are particularly well adapted to withstand adverse environmental conditions. Terrestrial ecosystems of the Antarctic are therefore largely dominated by lichens. The effects of global climate change are especially pronounced in the maritime Antarctic and it may be assumed that the lichen vegetation will profoundly change in the future. The genetic diversity of populations is closely correlated to their ability to adapt to changing environmental conditions and to their future evolutionary potential. In this study, we present evidence for low genetic diversity in Antarctic mycobiont and photobiont populations of the widespread lichen Cetraria aculeata. We compared between 110 and 219 DNA sequences from each of three gene loci for each symbiont. A total of 222 individuals from three Antarctic and nine antiboreal, temperate and Arctic populations were investigated. The mycobiont diversity is highest in Arctic populations, while the photobionts are most diverse in temperate regions. Photobiont diversity decreases significantly towards the Antarctic but less markedly towards the Arctic, indicating that ecological factors play a minor role in determining the diversity of Antarctic photobiont populations. Richness estimators calculated for the four geographical regions suggest that the low genetic diversity of Antarctic populations is not a sampling artefact. Cetraria aculeata appears to have diversified in the Arctic and subsequently expanded its range into the Southern Hemisphere. The reduced genetic diversity in the Antarctic is most likely due to founder effects during long-distance colonization. |
format |
Article in Journal/Newspaper |
author |
Stephanie Domaschke Fernando Fernández-Mendoza Miguel A. García María P. Martín Christian Printzen |
author_facet |
Stephanie Domaschke Fernando Fernández-Mendoza Miguel A. García María P. Martín Christian Printzen |
author_sort |
Stephanie Domaschke |
title |
Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
title_short |
Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
title_full |
Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
title_fullStr |
Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
title_full_unstemmed |
Low genetic diversity in Antarctic populations of the lichen-forming ascomycete Cetraria aculeata and its photobiont |
title_sort |
low genetic diversity in antarctic populations of the lichen-forming ascomycete cetraria aculeata and its photobiont |
publisher |
Norwegian Polar Institute |
publishDate |
2012 |
url |
https://doi.org/10.3402/polar.v31i0.17353 https://doaj.org/article/2b5b9e93e7324dd68c916a7273378449 |
geographic |
Arctic Antarctic The Antarctic |
geographic_facet |
Arctic Antarctic The Antarctic |
genre |
Antarc* Antarctic Arctic Climate change Polar Research |
genre_facet |
Antarc* Antarctic Arctic Climate change Polar Research |
op_source |
Polar Research, Vol 31, Iss 0, Pp 1-13 (2012) |
op_relation |
http://www.polarresearch.net/index.php/polar/article/view/17353/pdf_1 https://doaj.org/toc/0800-0395 https://doaj.org/toc/1751-8369 doi:10.3402/polar.v31i0.17353 0800-0395 1751-8369 https://doaj.org/article/2b5b9e93e7324dd68c916a7273378449 |
op_doi |
https://doi.org/10.3402/polar.v31i0.17353 |
container_title |
Polar Research |
container_volume |
31 |
container_issue |
1 |
container_start_page |
17353 |
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1766251466305044480 |