Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure
Abstract We quantified the metabolic cost to the Antarctic leafy liverwort Cephaloziella varians of responding to an abrupt increase in ultraviolet B (UVB) radiation exposure in the natural environment at Rothera Point on the western Antarctic Peninsula (67 °34′S, 68 °07′W). The liverwort was protec...
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crwiley:10.1111/j.1365-2486.2009.01929.x 2024-09-30T14:25:01+00:00 Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure SNELL, K. R. S. KOKUBUN, T. GRIFFITHS, H. CONVEY, P. HODGSON, D. A. NEWSHAM, K. K. 2009 http://dx.doi.org/10.1111/j.1365-2486.2009.01929.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2009.01929.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2009.01929.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Global Change Biology volume 15, issue 11, page 2563-2573 ISSN 1354-1013 1365-2486 journal-article 2009 crwiley https://doi.org/10.1111/j.1365-2486.2009.01929.x 2024-09-05T05:09:11Z Abstract We quantified the metabolic cost to the Antarctic leafy liverwort Cephaloziella varians of responding to an abrupt increase in ultraviolet B (UVB) radiation exposure in the natural environment at Rothera Point on the western Antarctic Peninsula (67 °34′S, 68 °07′W). The liverwort was protected from exposure to UVB radiation for 44 days with screens containing Mylar polyester, after which time its thalli, which are normally black in colour, had become green owing to reduced concentrations of an anthocyanidin, identified here as riccionidin A, in thallus tips. Thalli were then exposed to an abrupt increase in UVB radiation by removing the screens. The thalli became visibly darker within 48 h of the screens being removed, resynthesizing riccionidin A to the same concentration as that present in thalli outside screens during this period. Chlorophyll fluorescence measurements indicated that nonphotochemical quenching was higher in the thalli formerly under the screens than in those not previously covered with screens, but that F v / F m and photochemical quenching were the same in the two groups of thalli. We used data from aqueous phase oxygen electrode measurements to calculate an estimate for carbon fixation by C. varians during the 48 h after the screens were removed. Assuming a photosynthetic quotient for Antarctic bryophytes of 1, these analyses indicated that the minimum weight of carbon used to synthesize riccionidin A was equivalent to 1.85% of the carbon fixed by thalli during the 48 h after the abrupt increase in UVB radiation exposure. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Wiley Online Library Antarctic The Antarctic Antarctic Peninsula Rothera ENVELOPE(-68.130,-68.130,-67.568,-67.568) Rothera Point ENVELOPE(-68.133,-68.133,-67.567,-67.567) Global Change Biology 15 11 2563 2573 |
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crwiley |
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English |
description |
Abstract We quantified the metabolic cost to the Antarctic leafy liverwort Cephaloziella varians of responding to an abrupt increase in ultraviolet B (UVB) radiation exposure in the natural environment at Rothera Point on the western Antarctic Peninsula (67 °34′S, 68 °07′W). The liverwort was protected from exposure to UVB radiation for 44 days with screens containing Mylar polyester, after which time its thalli, which are normally black in colour, had become green owing to reduced concentrations of an anthocyanidin, identified here as riccionidin A, in thallus tips. Thalli were then exposed to an abrupt increase in UVB radiation by removing the screens. The thalli became visibly darker within 48 h of the screens being removed, resynthesizing riccionidin A to the same concentration as that present in thalli outside screens during this period. Chlorophyll fluorescence measurements indicated that nonphotochemical quenching was higher in the thalli formerly under the screens than in those not previously covered with screens, but that F v / F m and photochemical quenching were the same in the two groups of thalli. We used data from aqueous phase oxygen electrode measurements to calculate an estimate for carbon fixation by C. varians during the 48 h after the screens were removed. Assuming a photosynthetic quotient for Antarctic bryophytes of 1, these analyses indicated that the minimum weight of carbon used to synthesize riccionidin A was equivalent to 1.85% of the carbon fixed by thalli during the 48 h after the abrupt increase in UVB radiation exposure. |
format |
Article in Journal/Newspaper |
author |
SNELL, K. R. S. KOKUBUN, T. GRIFFITHS, H. CONVEY, P. HODGSON, D. A. NEWSHAM, K. K. |
spellingShingle |
SNELL, K. R. S. KOKUBUN, T. GRIFFITHS, H. CONVEY, P. HODGSON, D. A. NEWSHAM, K. K. Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
author_facet |
SNELL, K. R. S. KOKUBUN, T. GRIFFITHS, H. CONVEY, P. HODGSON, D. A. NEWSHAM, K. K. |
author_sort |
SNELL, K. R. S. |
title |
Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
title_short |
Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
title_full |
Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
title_fullStr |
Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
title_full_unstemmed |
Quantifying the metabolic cost to an Antarctic liverwort of responding to an abrupt increase in UVB radiation exposure |
title_sort |
quantifying the metabolic cost to an antarctic liverwort of responding to an abrupt increase in uvb radiation exposure |
publisher |
Wiley |
publishDate |
2009 |
url |
http://dx.doi.org/10.1111/j.1365-2486.2009.01929.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1365-2486.2009.01929.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1365-2486.2009.01929.x |
long_lat |
ENVELOPE(-68.130,-68.130,-67.568,-67.568) ENVELOPE(-68.133,-68.133,-67.567,-67.567) |
geographic |
Antarctic The Antarctic Antarctic Peninsula Rothera Rothera Point |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula Rothera Rothera Point |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_source |
Global Change Biology volume 15, issue 11, page 2563-2573 ISSN 1354-1013 1365-2486 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1365-2486.2009.01929.x |
container_title |
Global Change Biology |
container_volume |
15 |
container_issue |
11 |
container_start_page |
2563 |
op_container_end_page |
2573 |
_version_ |
1811643152007692288 |