Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice
Antarctic sea ice is an important feature of the southern ocean where at its maximum it can cover 8 % of the Southern Hemisphere. It provides a stable environment for the colonisation of diverse and highly specialised microbes which play a central role in the assimilation and regulation of energy th...
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ftvictoriauwfig:oai:figshare.com:article/16992562 2023-05-15T13:35:14+02:00 Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice Cowie, Rebecca Olivia MacLennan 2011-01-01T00:00:00Z https://doi.org/10.26686/wgtn.16992562.v1 https://figshare.com/articles/thesis/Bacterial_Community_Structure_Function_and_Diversity_in_Antarctic_Sea_Ice/16992562 unknown doi:10.26686/wgtn.16992562.v1 https://figshare.com/articles/thesis/Bacterial_Community_Structure_Function_and_Diversity_in_Antarctic_Sea_Ice/16992562 Author Retains Copyright Biological Sciences not elsewhere classified Microbial ecology Prokaryotic diversity School: School of Biological Sciences 069999 Biological Sciences not elsewhere classified Marsden: 270307 Microbial Ecology Degree Discipline: Ecology and Biodiversity Degree Level: Doctoral Degree Name: Doctor of Philosophy Text Thesis 2011 ftvictoriauwfig https://doi.org/10.26686/wgtn.16992562.v1 2021-11-18T00:09:03Z Antarctic sea ice is an important feature of the southern ocean where at its maximum it can cover 8 % of the Southern Hemisphere. It provides a stable environment for the colonisation of diverse and highly specialised microbes which play a central role in the assimilation and regulation of energy through the Antarctic food web. Polar environments are sensitive to changes in the environment. Small changes in temperature can have large effects on sea ice thickness and extent and Antarctic sea ice cover is expected to shrink by 25 % over the next century. It is unknown how the sea ice microbiota will respond. In order to understand the effects of climate change on the sea ice ecosystem it is necessary to obtain information about the community structure, function and diversity and their reactions with the environment. Studies have focused on algal diversity and physiology in Antarctic sea ice and in comparison studies on the prokaryotic community are few. Although prokaryotic diversity has been investigated using clone libraries and culture based methods, it is likely that certain species have still not been described. Almost nothing is known about the Antarctic sea ice bacterial community spatial and temporal dynamics under changing abiotic and biotic conditions or their role in biogeochemical cycles. This is the first study linking Antarctic bacterial communities to function by using statistics to investigate the relationships between environmental variables and community structure. Bacterial community structure was investigated by extracting both the DNA and RNA from the environment to understand both the metabolically active (RNA) and total (DNA) bacterial community. The thickness of the sea ice and nutrient concentrations were key factors regulating bacterial community composition in Antarctic sea ice. Sea ice thickness is likely to have an effect on the physiological responses of algae leading to changes in photosynthate concentrations and composition of dissolved organic matter (DOM). Further investigations ... Thesis Antarc* Antarctic Sea ice Southern Ocean Open Access Victoria University of Wellington / Te Herenga Waka Antarctic Marsden ENVELOPE(66.067,66.067,-67.867,-67.867) Southern Ocean The Antarctic |
institution |
Open Polar |
collection |
Open Access Victoria University of Wellington / Te Herenga Waka |
op_collection_id |
ftvictoriauwfig |
language |
unknown |
topic |
Biological Sciences not elsewhere classified Microbial ecology Prokaryotic diversity School: School of Biological Sciences 069999 Biological Sciences not elsewhere classified Marsden: 270307 Microbial Ecology Degree Discipline: Ecology and Biodiversity Degree Level: Doctoral Degree Name: Doctor of Philosophy |
spellingShingle |
Biological Sciences not elsewhere classified Microbial ecology Prokaryotic diversity School: School of Biological Sciences 069999 Biological Sciences not elsewhere classified Marsden: 270307 Microbial Ecology Degree Discipline: Ecology and Biodiversity Degree Level: Doctoral Degree Name: Doctor of Philosophy Cowie, Rebecca Olivia MacLennan Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
topic_facet |
Biological Sciences not elsewhere classified Microbial ecology Prokaryotic diversity School: School of Biological Sciences 069999 Biological Sciences not elsewhere classified Marsden: 270307 Microbial Ecology Degree Discipline: Ecology and Biodiversity Degree Level: Doctoral Degree Name: Doctor of Philosophy |
description |
Antarctic sea ice is an important feature of the southern ocean where at its maximum it can cover 8 % of the Southern Hemisphere. It provides a stable environment for the colonisation of diverse and highly specialised microbes which play a central role in the assimilation and regulation of energy through the Antarctic food web. Polar environments are sensitive to changes in the environment. Small changes in temperature can have large effects on sea ice thickness and extent and Antarctic sea ice cover is expected to shrink by 25 % over the next century. It is unknown how the sea ice microbiota will respond. In order to understand the effects of climate change on the sea ice ecosystem it is necessary to obtain information about the community structure, function and diversity and their reactions with the environment. Studies have focused on algal diversity and physiology in Antarctic sea ice and in comparison studies on the prokaryotic community are few. Although prokaryotic diversity has been investigated using clone libraries and culture based methods, it is likely that certain species have still not been described. Almost nothing is known about the Antarctic sea ice bacterial community spatial and temporal dynamics under changing abiotic and biotic conditions or their role in biogeochemical cycles. This is the first study linking Antarctic bacterial communities to function by using statistics to investigate the relationships between environmental variables and community structure. Bacterial community structure was investigated by extracting both the DNA and RNA from the environment to understand both the metabolically active (RNA) and total (DNA) bacterial community. The thickness of the sea ice and nutrient concentrations were key factors regulating bacterial community composition in Antarctic sea ice. Sea ice thickness is likely to have an effect on the physiological responses of algae leading to changes in photosynthate concentrations and composition of dissolved organic matter (DOM). Further investigations ... |
format |
Thesis |
author |
Cowie, Rebecca Olivia MacLennan |
author_facet |
Cowie, Rebecca Olivia MacLennan |
author_sort |
Cowie, Rebecca Olivia MacLennan |
title |
Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
title_short |
Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
title_full |
Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
title_fullStr |
Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
title_full_unstemmed |
Bacterial Community Structure, Function and Diversity in Antarctic Sea Ice |
title_sort |
bacterial community structure, function and diversity in antarctic sea ice |
publishDate |
2011 |
url |
https://doi.org/10.26686/wgtn.16992562.v1 https://figshare.com/articles/thesis/Bacterial_Community_Structure_Function_and_Diversity_in_Antarctic_Sea_Ice/16992562 |
long_lat |
ENVELOPE(66.067,66.067,-67.867,-67.867) |
geographic |
Antarctic Marsden Southern Ocean The Antarctic |
geographic_facet |
Antarctic Marsden Southern Ocean The Antarctic |
genre |
Antarc* Antarctic Sea ice Southern Ocean |
genre_facet |
Antarc* Antarctic Sea ice Southern Ocean |
op_relation |
doi:10.26686/wgtn.16992562.v1 https://figshare.com/articles/thesis/Bacterial_Community_Structure_Function_and_Diversity_in_Antarctic_Sea_Ice/16992562 |
op_rights |
Author Retains Copyright |
op_doi |
https://doi.org/10.26686/wgtn.16992562.v1 |
_version_ |
1766063270478741504 |