Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica
Abstract. Bryum argenteum, B. pseudotriquetrum and Ceratodon purpureus are the predominant mosses in Victoria Land, continental Antarctica. All have cosmopolitan distributions and are widespread throughout Antarctica with wide ecological amplitudes resulting in considerable morphological variation....
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crwiley:10.2307/3237144 2024-09-15T17:42:40+00:00 Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica Lewis Smith, R.I. 1999 http://dx.doi.org/10.2307/3237144 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3237144 https://onlinelibrary.wiley.com/doi/pdf/10.2307/3237144 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Vegetation Science volume 10, issue 2, page 231-242 ISSN 1100-9233 1654-1103 journal-article 1999 crwiley https://doi.org/10.2307/3237144 2024-07-25T04:19:27Z Abstract. Bryum argenteum, B. pseudotriquetrum and Ceratodon purpureus are the predominant mosses in Victoria Land, continental Antarctica. All have cosmopolitan distributions and are widespread throughout Antarctica with wide ecological amplitudes resulting in considerable morphological variation. They are well adapted to tolerate the physiological stresses imposed by the severe environment. This study investigates aspects of their growth, physiology and survival in response to habitat constraints, especially hydrology. Their distribution is controlled almost exclusively by moisture availability. Each species tends to predominate in a specific zone along hydrological gradients, with B. pseudotriquetrum on moist soil, C. purpureus on drier soil, and B. argenteum on unstable stream margins, fluvial deposits and the marginal capillary zone. Where conditions are optimal, each species can form a turf 6–10 cm thick. Nutrient status of the soil does not appear to be an important determinant in the distribution pattern within communities. The thermal regime of the moss turf varies according to its moisture content; for a period of ca. six weeks during the summer, with the frequent long spells of 24‐h sunshine, temperatures remain above 0 °C for much of the time even though air temperatures are frequently below the freezing point. This allows growth and metabolic activity to proceed continuously at a relatively rapid rate for quite long periods. Annual shoot incremental growth can exceed 3.5 mm in each species. Growth of B. argenteum may be inhibited by UV‐ B radiation. The optimal temperature for photosynthesis in each species is around 15 °C, but significant carbon fixation occurs at 5 °C. Photosynthetic rates at 5, 10 and 20 °C were B. argenteum > B. pseudotriquetrum > C. purpureus. Article in Journal/Newspaper Antarc* Antarctica Victoria Land Wiley Online Library Journal of Vegetation Science 10 2 231 242 |
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description |
Abstract. Bryum argenteum, B. pseudotriquetrum and Ceratodon purpureus are the predominant mosses in Victoria Land, continental Antarctica. All have cosmopolitan distributions and are widespread throughout Antarctica with wide ecological amplitudes resulting in considerable morphological variation. They are well adapted to tolerate the physiological stresses imposed by the severe environment. This study investigates aspects of their growth, physiology and survival in response to habitat constraints, especially hydrology. Their distribution is controlled almost exclusively by moisture availability. Each species tends to predominate in a specific zone along hydrological gradients, with B. pseudotriquetrum on moist soil, C. purpureus on drier soil, and B. argenteum on unstable stream margins, fluvial deposits and the marginal capillary zone. Where conditions are optimal, each species can form a turf 6–10 cm thick. Nutrient status of the soil does not appear to be an important determinant in the distribution pattern within communities. The thermal regime of the moss turf varies according to its moisture content; for a period of ca. six weeks during the summer, with the frequent long spells of 24‐h sunshine, temperatures remain above 0 °C for much of the time even though air temperatures are frequently below the freezing point. This allows growth and metabolic activity to proceed continuously at a relatively rapid rate for quite long periods. Annual shoot incremental growth can exceed 3.5 mm in each species. Growth of B. argenteum may be inhibited by UV‐ B radiation. The optimal temperature for photosynthesis in each species is around 15 °C, but significant carbon fixation occurs at 5 °C. Photosynthetic rates at 5, 10 and 20 °C were B. argenteum > B. pseudotriquetrum > C. purpureus. |
format |
Article in Journal/Newspaper |
author |
Lewis Smith, R.I. |
spellingShingle |
Lewis Smith, R.I. Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
author_facet |
Lewis Smith, R.I. |
author_sort |
Lewis Smith, R.I. |
title |
Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
title_short |
Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
title_full |
Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
title_fullStr |
Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
title_full_unstemmed |
Biological and environmental characteristics of three cosmopolitan mosses dominant in continental Antarctica |
title_sort |
biological and environmental characteristics of three cosmopolitan mosses dominant in continental antarctica |
publisher |
Wiley |
publishDate |
1999 |
url |
http://dx.doi.org/10.2307/3237144 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F3237144 https://onlinelibrary.wiley.com/doi/pdf/10.2307/3237144 |
genre |
Antarc* Antarctica Victoria Land |
genre_facet |
Antarc* Antarctica Victoria Land |
op_source |
Journal of Vegetation Science volume 10, issue 2, page 231-242 ISSN 1100-9233 1654-1103 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/3237144 |
container_title |
Journal of Vegetation Science |
container_volume |
10 |
container_issue |
2 |
container_start_page |
231 |
op_container_end_page |
242 |
_version_ |
1810489315542695936 |