Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard
Two abundant and partly dominating lichen species, Celraria nivalis and Cetraria delisei, were compared with respect to their thallus water content and their gas-exchange response to light, temperature and moisture in the field and in the laboratory. C. nivalis had higher net photosynthetic rates th...
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Language: | English |
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Norwegian Polar Institute
1992
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Online Access: | https://polarresearch.net/index.php/polar/article/view/2288 https://doi.org/10.3402/polar.v11i2.6717 |
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ftjpolarres:oai:journals.openacademia.net:article/2288 2023-05-15T15:06:39+02:00 Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard Schipperges, Barbara 1992-01-12 application/pdf https://polarresearch.net/index.php/polar/article/view/2288 https://doi.org/10.3402/polar.v11i2.6717 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2288/5538 https://polarresearch.net/index.php/polar/article/view/2288 doi:10.3402/polar.v11i2.6717 Copyright (c) 2018 Polar Research Polar Research; Vol. 11 No. 2 (1992); 47-68 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1992 ftjpolarres https://doi.org/10.3402/polar.v11i2.6717 2021-11-11T19:12:21Z Two abundant and partly dominating lichen species, Celraria nivalis and Cetraria delisei, were compared with respect to their thallus water content and their gas-exchange response to light, temperature and moisture in the field and in the laboratory. C. nivalis had higher net photosynthetic rates than C. delisei. The differences between the species were more pronounced when photosynthesis was related to dry weight than to chlorophyll content. Light compensation and light saturation of photosynthesis increased with increasing temperature. Higher light compensation and saturation values were found in C. delisei than in C. nivalis. The chionophobous C. nivalis showed moisture compensation and optimum water content for net photosynthesis at higher thallus water contents than the chionophilous C. delisei. Depression of net photosynthesis at thallus saturation, found in both species, is thought to be due to the increased internal CO2 diffusive resistance at high thallus water content. The maximum thallus water contents of C. nivalis were higher than those of C. delisei. The lower drying rate, found in C. delisei in comparison with that of C. nivalis, is attributed to the more sheltered position of its habitat and to morphological characteristics. Article in Journal/Newspaper Arctic Ny Ålesund Ny-Ålesund Polar Research Svalbard Polar Research (E-Journal) Arctic Ny-Ålesund Svalbard Polar Research 11 2 47 68 |
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Open Polar |
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Polar Research (E-Journal) |
op_collection_id |
ftjpolarres |
language |
English |
description |
Two abundant and partly dominating lichen species, Celraria nivalis and Cetraria delisei, were compared with respect to their thallus water content and their gas-exchange response to light, temperature and moisture in the field and in the laboratory. C. nivalis had higher net photosynthetic rates than C. delisei. The differences between the species were more pronounced when photosynthesis was related to dry weight than to chlorophyll content. Light compensation and light saturation of photosynthesis increased with increasing temperature. Higher light compensation and saturation values were found in C. delisei than in C. nivalis. The chionophobous C. nivalis showed moisture compensation and optimum water content for net photosynthesis at higher thallus water contents than the chionophilous C. delisei. Depression of net photosynthesis at thallus saturation, found in both species, is thought to be due to the increased internal CO2 diffusive resistance at high thallus water content. The maximum thallus water contents of C. nivalis were higher than those of C. delisei. The lower drying rate, found in C. delisei in comparison with that of C. nivalis, is attributed to the more sheltered position of its habitat and to morphological characteristics. |
format |
Article in Journal/Newspaper |
author |
Schipperges, Barbara |
spellingShingle |
Schipperges, Barbara Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
author_facet |
Schipperges, Barbara |
author_sort |
Schipperges, Barbara |
title |
Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
title_short |
Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
title_full |
Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
title_fullStr |
Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
title_full_unstemmed |
Patterns of CO2 gas-exchange and thallus water content in Arctic lichens along a ridge profile near Ny Ålesund, Svalbard |
title_sort |
patterns of co2 gas-exchange and thallus water content in arctic lichens along a ridge profile near ny ålesund, svalbard |
publisher |
Norwegian Polar Institute |
publishDate |
1992 |
url |
https://polarresearch.net/index.php/polar/article/view/2288 https://doi.org/10.3402/polar.v11i2.6717 |
geographic |
Arctic Ny-Ålesund Svalbard |
geographic_facet |
Arctic Ny-Ålesund Svalbard |
genre |
Arctic Ny Ålesund Ny-Ålesund Polar Research Svalbard |
genre_facet |
Arctic Ny Ålesund Ny-Ålesund Polar Research Svalbard |
op_source |
Polar Research; Vol. 11 No. 2 (1992); 47-68 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2288/5538 https://polarresearch.net/index.php/polar/article/view/2288 doi:10.3402/polar.v11i2.6717 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v11i2.6717 |
container_title |
Polar Research |
container_volume |
11 |
container_issue |
2 |
container_start_page |
47 |
op_container_end_page |
68 |
_version_ |
1766338220492062720 |