Response of Antarctic Cryoconite Microbial Communities to Light
Microbial communities on polar glacier surfaces are found dispersed on the ice surface, or concentrated in cryoconite holes and cryolakes, which are accumulations of debris covered by a layer of ice for some or all of the year. The ice lid limits the penetration of photosynthetically available radia...
Main Authors: | , , , , , , , , |
---|---|
Format: | Text |
Language: | unknown |
Published: |
PDXScholar
2016
|
Subjects: | |
Online Access: | https://pdxscholar.library.pdx.edu/geology_fac/99 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1098&context=geology_fac |
id |
ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1098 |
---|---|
record_format |
openpolar |
spelling |
ftportlandstate:oai:pdxscholar.library.pdx.edu:geology_fac-1098 2023-05-15T13:52:18+02:00 Response of Antarctic Cryoconite Microbial Communities to Light Bagshaw, Elizabeth A. Wadham, Jemma L. Tranter, Martyn Perkins, Rupert Morgan, Alistair Williamson, Christopher J. Fountain, Andrew G. Fitzsimons, Sean Dubnick, Ashley 2016-01-01T08:00:00Z application/pdf https://pdxscholar.library.pdx.edu/geology_fac/99 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1098&context=geology_fac unknown PDXScholar https://pdxscholar.library.pdx.edu/geology_fac/99 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1098&context=geology_fac Geology Faculty Publications and Presentations Cryoconite -- Antarctica -- Effect of light on Glaciers -- Ecology -- Antarctica Carbon cycle (Biogeochemistry) Photobiology Photochemistry Environmental Sciences Geology Glaciology text 2016 ftportlandstate 2022-01-09T19:39:54Z Microbial communities on polar glacier surfaces are found dispersed on the ice surface, or concentrated in cryoconite holes and cryolakes, which are accumulations of debris covered by a layer of ice for some or all of the year. The ice lid limits the penetration of photosynthetically available radiation (PAR) to the sediment layer, since the ice attenuates up to 99% of incoming radiation. This suite of field and laboratory experiments demonstrates that PAR is an important control on primary production in cryoconite and cryolake ecosystems. Increased light intensity increased efficiency of primary production in controlled laboratory incubations of debris from the surface of Joyce Glacier, McMurdo Dry Valleys, Antarctica. However, when light intensity was increased to levels near that received on the ice surface, without the protection of an ice lid, efficiency decreased and measurements of photophysiology showed that the communities suffered light stress. The communities are therefore well adapted to low light levels. Comparison with Arctic cryoconite communities, which are typically not covered by an ice lid for the majority of the ablation season, showed that these organisms were also stressed by high light, so they must employ strategies to protect against photodamage. Text Antarc* Antarctic Antarctica Arctic McMurdo Dry Valleys Portland State University: PDXScholar Antarctic Arctic Joyce Glacier ENVELOPE(163.700,163.700,-78.017,-78.017) McMurdo Dry Valleys |
institution |
Open Polar |
collection |
Portland State University: PDXScholar |
op_collection_id |
ftportlandstate |
language |
unknown |
topic |
Cryoconite -- Antarctica -- Effect of light on Glaciers -- Ecology -- Antarctica Carbon cycle (Biogeochemistry) Photobiology Photochemistry Environmental Sciences Geology Glaciology |
spellingShingle |
Cryoconite -- Antarctica -- Effect of light on Glaciers -- Ecology -- Antarctica Carbon cycle (Biogeochemistry) Photobiology Photochemistry Environmental Sciences Geology Glaciology Bagshaw, Elizabeth A. Wadham, Jemma L. Tranter, Martyn Perkins, Rupert Morgan, Alistair Williamson, Christopher J. Fountain, Andrew G. Fitzsimons, Sean Dubnick, Ashley Response of Antarctic Cryoconite Microbial Communities to Light |
topic_facet |
Cryoconite -- Antarctica -- Effect of light on Glaciers -- Ecology -- Antarctica Carbon cycle (Biogeochemistry) Photobiology Photochemistry Environmental Sciences Geology Glaciology |
description |
Microbial communities on polar glacier surfaces are found dispersed on the ice surface, or concentrated in cryoconite holes and cryolakes, which are accumulations of debris covered by a layer of ice for some or all of the year. The ice lid limits the penetration of photosynthetically available radiation (PAR) to the sediment layer, since the ice attenuates up to 99% of incoming radiation. This suite of field and laboratory experiments demonstrates that PAR is an important control on primary production in cryoconite and cryolake ecosystems. Increased light intensity increased efficiency of primary production in controlled laboratory incubations of debris from the surface of Joyce Glacier, McMurdo Dry Valleys, Antarctica. However, when light intensity was increased to levels near that received on the ice surface, without the protection of an ice lid, efficiency decreased and measurements of photophysiology showed that the communities suffered light stress. The communities are therefore well adapted to low light levels. Comparison with Arctic cryoconite communities, which are typically not covered by an ice lid for the majority of the ablation season, showed that these organisms were also stressed by high light, so they must employ strategies to protect against photodamage. |
format |
Text |
author |
Bagshaw, Elizabeth A. Wadham, Jemma L. Tranter, Martyn Perkins, Rupert Morgan, Alistair Williamson, Christopher J. Fountain, Andrew G. Fitzsimons, Sean Dubnick, Ashley |
author_facet |
Bagshaw, Elizabeth A. Wadham, Jemma L. Tranter, Martyn Perkins, Rupert Morgan, Alistair Williamson, Christopher J. Fountain, Andrew G. Fitzsimons, Sean Dubnick, Ashley |
author_sort |
Bagshaw, Elizabeth A. |
title |
Response of Antarctic Cryoconite Microbial Communities to Light |
title_short |
Response of Antarctic Cryoconite Microbial Communities to Light |
title_full |
Response of Antarctic Cryoconite Microbial Communities to Light |
title_fullStr |
Response of Antarctic Cryoconite Microbial Communities to Light |
title_full_unstemmed |
Response of Antarctic Cryoconite Microbial Communities to Light |
title_sort |
response of antarctic cryoconite microbial communities to light |
publisher |
PDXScholar |
publishDate |
2016 |
url |
https://pdxscholar.library.pdx.edu/geology_fac/99 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1098&context=geology_fac |
long_lat |
ENVELOPE(163.700,163.700,-78.017,-78.017) |
geographic |
Antarctic Arctic Joyce Glacier McMurdo Dry Valleys |
geographic_facet |
Antarctic Arctic Joyce Glacier McMurdo Dry Valleys |
genre |
Antarc* Antarctic Antarctica Arctic McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica Arctic McMurdo Dry Valleys |
op_source |
Geology Faculty Publications and Presentations |
op_relation |
https://pdxscholar.library.pdx.edu/geology_fac/99 https://pdxscholar.library.pdx.edu/cgi/viewcontent.cgi?article=1098&context=geology_fac |
_version_ |
1766256592936763392 |