Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens
During the middle of the 1992 austral winter in the northern Windmill Islands, continental Antarctica, a highly unusual climatic event occurred in which the air temperature exceeded 0 C for some 60 h, at the end of which there was a significant rain shower before the ambient temperature returned to...
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Online Access: | https://doi.org/10.1046/j.1469-8137.1997.00785.x http://ecite.utas.edu.au/10342 |
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ftunivtasecite:oai:ecite.utas.edu.au:10342 2023-05-15T13:56:40+02:00 Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens Hovenden, MJ 1997 https://doi.org/10.1046/j.1469-8137.1997.00785.x http://ecite.utas.edu.au/10342 en eng Blackwell Publishing Ltd http://dx.doi.org/10.1046/j.1469-8137.1997.00785.x Hovenden, MJ, Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens, New Phytologist, 137, (2) pp. 241-246. ISSN 0028-646X (1997) [Refereed Article] http://ecite.utas.edu.au/10342 Biological Sciences Ecology Terrestrial Ecology Refereed Article PeerReviewed 1997 ftunivtasecite https://doi.org/10.1046/j.1469-8137.1997.00785.x 2019-12-13T20:55:49Z During the middle of the 1992 austral winter in the northern Windmill Islands, continental Antarctica, a highly unusual climatic event occurred in which the air temperature exceeded 0 C for some 60 h, at the end of which there was a significant rain shower before the ambient temperature returned to subzero conditions. This event caused most of the snow cover to melt and refreeze as clear ice. Lichens were thus rehydrated in the dark, in some places completely inundated, then frozen in ice. The effect that these conditions had on the distribution of K, Na, Mg and Ca within the thallus was estimated for two of the dominant macrolichen species, Umbilicaria decussata (Vill.) Zahlbr. and Usnea sphacelata R.Br, from three sites on a knoll on Clark Peninsula. One site acted as a natural control, owing to the very deep snow cover at the site, which protected lichens from the rewetting event. Despite persistent differences between species and the various sites, there was no overall effect of the climatic event on the membrane integrity of either lichen species. Only Usnea sphacelata from the most exposed site showed a significant leakage of K across the cell membrane, which indicated a loss of membrane integrity. Overall, both species were tolerant of the extreme conditions, although Umbilicaria decussata was the more tolerant. Article in Journal/Newspaper Antarc* Antarctic Antarctica Windmill Islands eCite UTAS (University of Tasmania) Antarctic Austral Clark Peninsula ENVELOPE(110.563,110.563,-66.254,-66.254) Windmill Islands ENVELOPE(110.417,110.417,-66.350,-66.350) New Phytologist 137 2 241 246 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Terrestrial Ecology |
spellingShingle |
Biological Sciences Ecology Terrestrial Ecology Hovenden, MJ Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
topic_facet |
Biological Sciences Ecology Terrestrial Ecology |
description |
During the middle of the 1992 austral winter in the northern Windmill Islands, continental Antarctica, a highly unusual climatic event occurred in which the air temperature exceeded 0 C for some 60 h, at the end of which there was a significant rain shower before the ambient temperature returned to subzero conditions. This event caused most of the snow cover to melt and refreeze as clear ice. Lichens were thus rehydrated in the dark, in some places completely inundated, then frozen in ice. The effect that these conditions had on the distribution of K, Na, Mg and Ca within the thallus was estimated for two of the dominant macrolichen species, Umbilicaria decussata (Vill.) Zahlbr. and Usnea sphacelata R.Br, from three sites on a knoll on Clark Peninsula. One site acted as a natural control, owing to the very deep snow cover at the site, which protected lichens from the rewetting event. Despite persistent differences between species and the various sites, there was no overall effect of the climatic event on the membrane integrity of either lichen species. Only Usnea sphacelata from the most exposed site showed a significant leakage of K across the cell membrane, which indicated a loss of membrane integrity. Overall, both species were tolerant of the extreme conditions, although Umbilicaria decussata was the more tolerant. |
format |
Article in Journal/Newspaper |
author |
Hovenden, MJ |
author_facet |
Hovenden, MJ |
author_sort |
Hovenden, MJ |
title |
Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
title_short |
Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
title_full |
Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
title_fullStr |
Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
title_full_unstemmed |
Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens |
title_sort |
effects of a rapid, unseasonal rewetting event on mineral location in antarctic lichens |
publisher |
Blackwell Publishing Ltd |
publishDate |
1997 |
url |
https://doi.org/10.1046/j.1469-8137.1997.00785.x http://ecite.utas.edu.au/10342 |
long_lat |
ENVELOPE(110.563,110.563,-66.254,-66.254) ENVELOPE(110.417,110.417,-66.350,-66.350) |
geographic |
Antarctic Austral Clark Peninsula Windmill Islands |
geographic_facet |
Antarctic Austral Clark Peninsula Windmill Islands |
genre |
Antarc* Antarctic Antarctica Windmill Islands |
genre_facet |
Antarc* Antarctic Antarctica Windmill Islands |
op_relation |
http://dx.doi.org/10.1046/j.1469-8137.1997.00785.x Hovenden, MJ, Effects of a rapid, unseasonal rewetting event on mineral location in Antarctic lichens, New Phytologist, 137, (2) pp. 241-246. ISSN 0028-646X (1997) [Refereed Article] http://ecite.utas.edu.au/10342 |
op_doi |
https://doi.org/10.1046/j.1469-8137.1997.00785.x |
container_title |
New Phytologist |
container_volume |
137 |
container_issue |
2 |
container_start_page |
241 |
op_container_end_page |
246 |
_version_ |
1766264220558557184 |