Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica
Estimates of lichen growth rates based on the measurements of several thalli at any site do not exist for continental Antarctica. However, the very limited existing data suggest that lichen growth rate may be a good indicator of climate change in Antarctica. We present measurements made on thalli of...
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ftunivwaikato:oai:researchcommons.waikato.ac.nz:10289/5820 2023-12-10T09:42:06+01:00 Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica Green, T.G. Allan Brabyn, Lars Beard, Catherine Sancho, Leopoldo G. 2011 https://hdl.handle.net/10289/5820 https://doi.org/10.1007/s00300-011-1098-7 en eng Springer http://www.springerlink.com/content/u226k3m3n2324q41/ Polar Biology Green, T.G.A., Brabyn, L., Beard, C. & Sancho, L.G. (2011). Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica. Polar Biology, published online on 9 September 2011. https://hdl.handle.net/10289/5820 doi:10.1007/s00300-011-1098-7 lichenometry radial growth snow Ross Sea Antarctica extreme environment Journal Article 2011 ftunivwaikato https://doi.org/10.1007/s00300-011-1098-7 2023-11-14T18:25:32Z Estimates of lichen growth rates based on the measurements of several thalli at any site do not exist for continental Antarctica. However, the very limited existing data suggest that lichen growth rate may be a good indicator of climate change in Antarctica. We present measurements made on thalli of the lichen Buellia frigida Darb. growing in the Dry Valleys, Southern Victoria Land, continental Antarctica, which appear to have some of the slowest radial growth rates yet measured. Photographs of thalli at three different sites were analysed for growth over a 25-year period using nano-GIS techniques. At one site, Mt. Falconer Summit, the lichens had a mean growth rate of 0.0052 mm year-1 with one individual as low as 0.0036 mm year-1. Thalli at the other two sites had significantly higher mean growth rates, 0.0136 mm year-1 at Mt. Falconer Ridge and 0.0118 mm year-1 at Rhone Bench. Assuming a constant growth rate, thalli at Mt. Falconer Summit had a mean age of 5,367 years, whilst the thalli at the other two sites were much younger, 840–1,026 years. We suggest that the different ages represent the appearance of new substrate for colonisation following climate changes in the Dry Valleys that altered the amount and duration of snow. The results confirm that lichen growth rate differs by almost two orders of magnitude over a latitudinal range of 15 degrees from south to north across Antarctica. Article in Journal/Newspaper Antarc* Antarctica Polar Biology Ross Sea Victoria Land The University of Waikato: Research Commons Falconer ENVELOPE(163.100,163.100,-77.583,-77.583) Rhone ENVELOPE(158.733,158.733,-79.983,-79.983) Ross Sea Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Victoria Land Polar Biology 35 4 535 541 |
institution |
Open Polar |
collection |
The University of Waikato: Research Commons |
op_collection_id |
ftunivwaikato |
language |
English |
topic |
lichenometry radial growth snow Ross Sea Antarctica extreme environment |
spellingShingle |
lichenometry radial growth snow Ross Sea Antarctica extreme environment Green, T.G. Allan Brabyn, Lars Beard, Catherine Sancho, Leopoldo G. Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
topic_facet |
lichenometry radial growth snow Ross Sea Antarctica extreme environment |
description |
Estimates of lichen growth rates based on the measurements of several thalli at any site do not exist for continental Antarctica. However, the very limited existing data suggest that lichen growth rate may be a good indicator of climate change in Antarctica. We present measurements made on thalli of the lichen Buellia frigida Darb. growing in the Dry Valleys, Southern Victoria Land, continental Antarctica, which appear to have some of the slowest radial growth rates yet measured. Photographs of thalli at three different sites were analysed for growth over a 25-year period using nano-GIS techniques. At one site, Mt. Falconer Summit, the lichens had a mean growth rate of 0.0052 mm year-1 with one individual as low as 0.0036 mm year-1. Thalli at the other two sites had significantly higher mean growth rates, 0.0136 mm year-1 at Mt. Falconer Ridge and 0.0118 mm year-1 at Rhone Bench. Assuming a constant growth rate, thalli at Mt. Falconer Summit had a mean age of 5,367 years, whilst the thalli at the other two sites were much younger, 840–1,026 years. We suggest that the different ages represent the appearance of new substrate for colonisation following climate changes in the Dry Valleys that altered the amount and duration of snow. The results confirm that lichen growth rate differs by almost two orders of magnitude over a latitudinal range of 15 degrees from south to north across Antarctica. |
format |
Article in Journal/Newspaper |
author |
Green, T.G. Allan Brabyn, Lars Beard, Catherine Sancho, Leopoldo G. |
author_facet |
Green, T.G. Allan Brabyn, Lars Beard, Catherine Sancho, Leopoldo G. |
author_sort |
Green, T.G. Allan |
title |
Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
title_short |
Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
title_full |
Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
title_fullStr |
Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
title_full_unstemmed |
Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica |
title_sort |
extremely low lichen growth rates in taylor valley, dry valleys, continental antarctica |
publisher |
Springer |
publishDate |
2011 |
url |
https://hdl.handle.net/10289/5820 https://doi.org/10.1007/s00300-011-1098-7 |
long_lat |
ENVELOPE(163.100,163.100,-77.583,-77.583) ENVELOPE(158.733,158.733,-79.983,-79.983) ENVELOPE(163.000,163.000,-77.617,-77.617) |
geographic |
Falconer Rhone Ross Sea Taylor Valley Victoria Land |
geographic_facet |
Falconer Rhone Ross Sea Taylor Valley Victoria Land |
genre |
Antarc* Antarctica Polar Biology Ross Sea Victoria Land |
genre_facet |
Antarc* Antarctica Polar Biology Ross Sea Victoria Land |
op_relation |
http://www.springerlink.com/content/u226k3m3n2324q41/ Polar Biology Green, T.G.A., Brabyn, L., Beard, C. & Sancho, L.G. (2011). Extremely low lichen growth rates in Taylor Valley, Dry Valleys, continental Antarctica. Polar Biology, published online on 9 September 2011. https://hdl.handle.net/10289/5820 doi:10.1007/s00300-011-1098-7 |
op_doi |
https://doi.org/10.1007/s00300-011-1098-7 |
container_title |
Polar Biology |
container_volume |
35 |
container_issue |
4 |
container_start_page |
535 |
op_container_end_page |
541 |
_version_ |
1784884851884687360 |