Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic
Carbon fixation under controlled conditions was measured in three mosses from the maritime Antarctic using an infra-red gas analysis system. Gas exchange parameters were determined during each season in 1993 and 1994 using the Arrhenius equation and a hyperbolic tangent function applied to respirati...
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1996
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fthighwire:oai:open-archive.highwire.org:annbot:78/6/719 2023-05-15T13:42:50+02:00 Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic DAVEY, MARTIN C. ROTHERY, PETER 1996-12-01 00:00:00.0 text/html http://aob.oxfordjournals.org/cgi/content/short/78/6/719 https://doi.org/10.1006/anbo.1996.0182 en eng Oxford University Press http://aob.oxfordjournals.org/cgi/content/short/78/6/719 http://dx.doi.org/10.1006/anbo.1996.0182 Copyright (C) 1996, Oxford University Press ORIGINAL ARTICLES TEXT 1996 fthighwire https://doi.org/10.1006/anbo.1996.0182 2013-05-26T14:15:49Z Carbon fixation under controlled conditions was measured in three mosses from the maritime Antarctic using an infra-red gas analysis system. Gas exchange parameters were determined during each season in 1993 and 1994 using the Arrhenius equation and a hyperbolic tangent function applied to respiration and photosynthesis, respectively. Environmental data was collected in 1994 for comparison. All seasonal variations were greater in Brachythecium than in the species from less hydric habitats. Respiration rates were highest in summer and lowest in winter at all temperatures in Brachythecium , but there was little change in Chorisodontium or Andreaea . There was some seasonal variation in the initial slope (K p ) of the photosynthesis-irradiance curve in all species, although the environmental data suggested that this was of little ecological importance. In all species seasonal changes in the maximum rates of photosynthesis (GP max , NP max ) were observed, generally with a pattern of summer maxima, although there were some interannual differences. These changes are considered to be the most important in affecting the overall annual productivity of the mosses. There were no seasonal variations in the optimum temperatures for either gross or net photosynthesis, or for the irradiance at the onset of light saturation (I k ). The results have important implications for the use of models to estimate the productivity of the Antarctic flora based upon present or predicted climate data. Text Antarc* Antarctic HighWire Press (Stanford University) Antarctic The Antarctic Annals of Botany 78 6 719 728 |
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Open Polar |
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HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
ORIGINAL ARTICLES |
spellingShingle |
ORIGINAL ARTICLES DAVEY, MARTIN C. ROTHERY, PETER Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
topic_facet |
ORIGINAL ARTICLES |
description |
Carbon fixation under controlled conditions was measured in three mosses from the maritime Antarctic using an infra-red gas analysis system. Gas exchange parameters were determined during each season in 1993 and 1994 using the Arrhenius equation and a hyperbolic tangent function applied to respiration and photosynthesis, respectively. Environmental data was collected in 1994 for comparison. All seasonal variations were greater in Brachythecium than in the species from less hydric habitats. Respiration rates were highest in summer and lowest in winter at all temperatures in Brachythecium , but there was little change in Chorisodontium or Andreaea . There was some seasonal variation in the initial slope (K p ) of the photosynthesis-irradiance curve in all species, although the environmental data suggested that this was of little ecological importance. In all species seasonal changes in the maximum rates of photosynthesis (GP max , NP max ) were observed, generally with a pattern of summer maxima, although there were some interannual differences. These changes are considered to be the most important in affecting the overall annual productivity of the mosses. There were no seasonal variations in the optimum temperatures for either gross or net photosynthesis, or for the irradiance at the onset of light saturation (I k ). The results have important implications for the use of models to estimate the productivity of the Antarctic flora based upon present or predicted climate data. |
format |
Text |
author |
DAVEY, MARTIN C. ROTHERY, PETER |
author_facet |
DAVEY, MARTIN C. ROTHERY, PETER |
author_sort |
DAVEY, MARTIN C. |
title |
Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
title_short |
Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
title_full |
Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
title_fullStr |
Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
title_full_unstemmed |
Seasonal Variation in Respiratory and Photosynthetic Parameters in Three Mosses from the Maritime Antarctic |
title_sort |
seasonal variation in respiratory and photosynthetic parameters in three mosses from the maritime antarctic |
publisher |
Oxford University Press |
publishDate |
1996 |
url |
http://aob.oxfordjournals.org/cgi/content/short/78/6/719 https://doi.org/10.1006/anbo.1996.0182 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://aob.oxfordjournals.org/cgi/content/short/78/6/719 http://dx.doi.org/10.1006/anbo.1996.0182 |
op_rights |
Copyright (C) 1996, Oxford University Press |
op_doi |
https://doi.org/10.1006/anbo.1996.0182 |
container_title |
Annals of Botany |
container_volume |
78 |
container_issue |
6 |
container_start_page |
719 |
op_container_end_page |
728 |
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1766173279858458624 |