Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes
During the short, snow-free growing seasons in the Arctic, sudden “cold snaps” or freeze thaw events (FTE) frequently occur when temperatures fall subzero for 24 to 72 h. Vascular plants exposed to FTE are often irreversibly damaged, but despite their importance, the responses of nonvascular plants...
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ftfloridaintuniv:oai:digitalcommons.fiu.edu:etd-3589 2023-05-15T14:54:00+02:00 Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes Colby, Jane Sarah 2007-10-29T07:00:00Z application/pdf https://digitalcommons.fiu.edu/etd/2403 https://digitalcommons.fiu.edu/cgi/viewcontent.cgi?article=3589&context=etd unknown FIU Digital Commons https://digitalcommons.fiu.edu/etd/2403 https://digitalcommons.fiu.edu/cgi/viewcontent.cgi?article=3589&context=etd FIU Electronic Theses and Dissertations Biology text 2007 ftfloridaintuniv 2023-01-23T21:18:23Z During the short, snow-free growing seasons in the Arctic, sudden “cold snaps” or freeze thaw events (FTE) frequently occur when temperatures fall subzero for 24 to 72 h. Vascular plants exposed to FTE are often irreversibly damaged, but despite their importance, the responses of nonvascular plants to FTE have been little studied. I grew plants of Sphagnum girgensonhii under high and low light and temperature conditions to investigate whether pre-freeze conditions influence damage and recovery of this important moss species. Plants grown at low light and high temperature showed the greatest growth. Upon freezing they also showed irreversible physiological damage and the greatest reduction in growth. Furthermore, some growing conditions resulted in increased production of new branches that were lost during freezing. The findings of this study suggest that the responses of Sphagnum species to climate variation may be important for the structure of arctic plant communities. Text Arctic Florida International University: Digital Commons@FIU Arctic |
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Open Polar |
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Florida International University: Digital Commons@FIU |
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ftfloridaintuniv |
language |
unknown |
topic |
Biology |
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Biology Colby, Jane Sarah Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
topic_facet |
Biology |
description |
During the short, snow-free growing seasons in the Arctic, sudden “cold snaps” or freeze thaw events (FTE) frequently occur when temperatures fall subzero for 24 to 72 h. Vascular plants exposed to FTE are often irreversibly damaged, but despite their importance, the responses of nonvascular plants to FTE have been little studied. I grew plants of Sphagnum girgensonhii under high and low light and temperature conditions to investigate whether pre-freeze conditions influence damage and recovery of this important moss species. Plants grown at low light and high temperature showed the greatest growth. Upon freezing they also showed irreversible physiological damage and the greatest reduction in growth. Furthermore, some growing conditions resulted in increased production of new branches that were lost during freezing. The findings of this study suggest that the responses of Sphagnum species to climate variation may be important for the structure of arctic plant communities. |
format |
Text |
author |
Colby, Jane Sarah |
author_facet |
Colby, Jane Sarah |
author_sort |
Colby, Jane Sarah |
title |
Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
title_short |
Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
title_full |
Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
title_fullStr |
Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
title_full_unstemmed |
Effects of a short-term freeze on Sphagnum girgensohnii grown under different light-temperature regimes |
title_sort |
effects of a short-term freeze on sphagnum girgensohnii grown under different light-temperature regimes |
publisher |
FIU Digital Commons |
publishDate |
2007 |
url |
https://digitalcommons.fiu.edu/etd/2403 https://digitalcommons.fiu.edu/cgi/viewcontent.cgi?article=3589&context=etd |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
FIU Electronic Theses and Dissertations |
op_relation |
https://digitalcommons.fiu.edu/etd/2403 https://digitalcommons.fiu.edu/cgi/viewcontent.cgi?article=3589&context=etd |
_version_ |
1766325699520495616 |