CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS
The proliferation of microalgae in the McMurdo Dry Valleys of Antarctica is intricately linked to the seasonal cycle involving the freezing and melting of water. Anecdotal observations and preliminary sampling have found cyanobacterial cells in ice covers on lakes in the McMurdo Dry Valleys, and sev...
Published in: | Journal of Phycology |
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crwiley:10.1046/j.1529-8817.1998.340587.x 2024-06-02T07:58:04+00:00 CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS Fritsen, Christian H. Priscu, John C. 1998 http://dx.doi.org/10.1046/j.1529-8817.1998.340587.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1529-8817.1998.340587.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Phycology volume 34, issue 4, page 587-597 ISSN 0022-3646 1529-8817 journal-article 1998 crwiley https://doi.org/10.1046/j.1529-8817.1998.340587.x 2024-05-03T12:05:28Z The proliferation of microalgae in the McMurdo Dry Valleys of Antarctica is intricately linked to the seasonal cycle involving the freezing and melting of water. Anecdotal observations and preliminary sampling have found cyanobacterial cells in ice covers on lakes in the McMurdo Dry Valleys, and several of these ice covers are known to undergo seasonal freeze–thaw cycles. Therefore, we sought to determine the distribution and abundance of cyanobacterial assemblages in several permanent ice covers throughout the McMurdo Dry Valleys and to determine their rates of growth and their photosynthetic physiologies upon encountering liquid water. We found that the majority of the permanent ice covers contained cyanobacterial assemblages in close association with sedimentary material. Cyanobacterial biomass was conspicuously absent in sediment‐free ice covers, suggesting that the seasonal interaction between the sediments, ice, and solar radiation present the necessary liquid water environment for cyanobacterial growth. All assemblages exhibited extremely low rates of photosynthesis when first exposed to liquid water. Despite the low rates of photosynthesis, a large proportion (41%) of the photosynthate was incorporated into protein, indicating that the cells were undergoing efficient net cellular growth. The short‐term response (24 h) of photosynthesis to a range of temperatures showed optimum rates occurring at temperatures >15° C, which is similar to those of psychrotrophic cyanobacteria isolates from soil and stream habitats, which we believe provides the inoculum for the in‐ ice habitats. Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Dry Valleys Wiley Online Library Antarctic McMurdo Dry Valleys Journal of Phycology 34 4 587 597 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
The proliferation of microalgae in the McMurdo Dry Valleys of Antarctica is intricately linked to the seasonal cycle involving the freezing and melting of water. Anecdotal observations and preliminary sampling have found cyanobacterial cells in ice covers on lakes in the McMurdo Dry Valleys, and several of these ice covers are known to undergo seasonal freeze–thaw cycles. Therefore, we sought to determine the distribution and abundance of cyanobacterial assemblages in several permanent ice covers throughout the McMurdo Dry Valleys and to determine their rates of growth and their photosynthetic physiologies upon encountering liquid water. We found that the majority of the permanent ice covers contained cyanobacterial assemblages in close association with sedimentary material. Cyanobacterial biomass was conspicuously absent in sediment‐free ice covers, suggesting that the seasonal interaction between the sediments, ice, and solar radiation present the necessary liquid water environment for cyanobacterial growth. All assemblages exhibited extremely low rates of photosynthesis when first exposed to liquid water. Despite the low rates of photosynthesis, a large proportion (41%) of the photosynthate was incorporated into protein, indicating that the cells were undergoing efficient net cellular growth. The short‐term response (24 h) of photosynthesis to a range of temperatures showed optimum rates occurring at temperatures >15° C, which is similar to those of psychrotrophic cyanobacteria isolates from soil and stream habitats, which we believe provides the inoculum for the in‐ ice habitats. |
format |
Article in Journal/Newspaper |
author |
Fritsen, Christian H. Priscu, John C. |
spellingShingle |
Fritsen, Christian H. Priscu, John C. CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
author_facet |
Fritsen, Christian H. Priscu, John C. |
author_sort |
Fritsen, Christian H. |
title |
CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
title_short |
CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
title_full |
CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
title_fullStr |
CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
title_full_unstemmed |
CYANOBACTERIAL ASSEMBLAGES IN PERMANENT ICE COVERS ON ANTARCTIC LAKES: DISTRIBUTION, GROWTH RATE, AND TEMPERATURE RESPONSE OF PHOTOSYNTHESIS |
title_sort |
cyanobacterial assemblages in permanent ice covers on antarctic lakes: distribution, growth rate, and temperature response of photosynthesis |
publisher |
Wiley |
publishDate |
1998 |
url |
http://dx.doi.org/10.1046/j.1529-8817.1998.340587.x http://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1046%2Fj.1529-8817.1998.340587.x |
geographic |
Antarctic McMurdo Dry Valleys |
geographic_facet |
Antarctic McMurdo Dry Valleys |
genre |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Dry Valleys |
op_source |
Journal of Phycology volume 34, issue 4, page 587-597 ISSN 0022-3646 1529-8817 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1046/j.1529-8817.1998.340587.x |
container_title |
Journal of Phycology |
container_volume |
34 |
container_issue |
4 |
container_start_page |
587 |
op_container_end_page |
597 |
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1800741318229491712 |