Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh
Coastal brackish and salt marshes in the High Arctic are very limited floristically and in areal extent. Small marshes located on the northeast coast of Devon Island are dominated by distinct zones of Puccinellia phryganodes nearest the sea with Carex ursina, C. stans, Dupontia fisheri, and Alopecur...
Published in: | Canadian Journal of Botany |
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Language: | French |
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Canadian Science Publishing
1987
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Online Access: | http://dx.doi.org/10.1139/b87-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-118 |
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crcansciencepubl:10.1139/b87-118 2023-12-17T10:25:20+01:00 Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh Dawson, Todd E. Bliss, L. C. 1987 http://dx.doi.org/10.1139/b87-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-118 fr fre Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Botany volume 65, issue 5, page 863-868 ISSN 0008-4026 Plant Science journal-article 1987 crcansciencepubl https://doi.org/10.1139/b87-118 2023-11-19T13:38:33Z Coastal brackish and salt marshes in the High Arctic are very limited floristically and in areal extent. Small marshes located on the northeast coast of Devon Island are dominated by distinct zones of Puccinellia phryganodes nearest the sea with Carex ursina, C. stans, Dupontia fisheri, and Alopecurus alpinus dominated zones landward. Soil salinity and chloride ion content increase seaward, but plant water potential becomes less negative, opposite to the expected pattern. Fresh water from the melting pack ice forms a lens over the more dense seawater below it. This meltwater dilutes the salts in the upper soil layer, creating a low salinity condition for the plants that inhabit the zones nearest the sea. We hypothesize that it is this "fresh" water that comes into contact with the roots of Puccinellia and Carex ursina, and thus, less-negative water potentials are maintained in these species. Although plant zonation can be explained in part by such considerations, we conclude that edaphic characteristics are not the only factors involved. A number of hypotheses are entertained. Article in Journal/Newspaper Arctic Devon Island Dupontia fisheri Puccinellia phryganodes Canadian Science Publishing (via Crossref) Arctic Devon Island ENVELOPE(-88.000,-88.000,75.252,75.252) Canadian Journal of Botany 65 5 863 868 |
institution |
Open Polar |
collection |
Canadian Science Publishing (via Crossref) |
op_collection_id |
crcansciencepubl |
language |
French |
topic |
Plant Science |
spellingShingle |
Plant Science Dawson, Todd E. Bliss, L. C. Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
topic_facet |
Plant Science |
description |
Coastal brackish and salt marshes in the High Arctic are very limited floristically and in areal extent. Small marshes located on the northeast coast of Devon Island are dominated by distinct zones of Puccinellia phryganodes nearest the sea with Carex ursina, C. stans, Dupontia fisheri, and Alopecurus alpinus dominated zones landward. Soil salinity and chloride ion content increase seaward, but plant water potential becomes less negative, opposite to the expected pattern. Fresh water from the melting pack ice forms a lens over the more dense seawater below it. This meltwater dilutes the salts in the upper soil layer, creating a low salinity condition for the plants that inhabit the zones nearest the sea. We hypothesize that it is this "fresh" water that comes into contact with the roots of Puccinellia and Carex ursina, and thus, less-negative water potentials are maintained in these species. Although plant zonation can be explained in part by such considerations, we conclude that edaphic characteristics are not the only factors involved. A number of hypotheses are entertained. |
format |
Article in Journal/Newspaper |
author |
Dawson, Todd E. Bliss, L. C. |
author_facet |
Dawson, Todd E. Bliss, L. C. |
author_sort |
Dawson, Todd E. |
title |
Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
title_short |
Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
title_full |
Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
title_fullStr |
Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
title_full_unstemmed |
Species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
title_sort |
species patterns, edaphic characteristics, and plant water potential in a high-arctic brackish marsh |
publisher |
Canadian Science Publishing |
publishDate |
1987 |
url |
http://dx.doi.org/10.1139/b87-118 http://www.nrcresearchpress.com/doi/pdf/10.1139/b87-118 |
long_lat |
ENVELOPE(-88.000,-88.000,75.252,75.252) |
geographic |
Arctic Devon Island |
geographic_facet |
Arctic Devon Island |
genre |
Arctic Devon Island Dupontia fisheri Puccinellia phryganodes |
genre_facet |
Arctic Devon Island Dupontia fisheri Puccinellia phryganodes |
op_source |
Canadian Journal of Botany volume 65, issue 5, page 863-868 ISSN 0008-4026 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/b87-118 |
container_title |
Canadian Journal of Botany |
container_volume |
65 |
container_issue |
5 |
container_start_page |
863 |
op_container_end_page |
868 |
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1785575792825073664 |