In situ net primary productivity of an Antarctic fast ice bottom algal community
Net primary production was measured in situ in an Antarctic fast ice bottom algal mat at Cape Evans, McMurdo Sound, Antarctica. Under-ice PAR irradiances between 18 November and 4 December 1997 were between 3 and 55 mol photons m-2 s-1. This produced a net oxygen export between 0.0084 and 0.0440 nmo...
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ftunivtasecite:oai:ecite.utas.edu.au:20145 2023-05-15T13:59:07+02:00 In situ net primary productivity of an Antarctic fast ice bottom algal community McMinn, A Ashworth, CM Ryan, KG 2000 application/pdf https://doi.org/10.3354/ame021177 http://ecite.utas.edu.au/20145 en eng Inter-Research http://ecite.utas.edu.au/20145/1/McMinn 2000.pdf http://dx.doi.org/10.3354/ame021177 McMinn, A and Ashworth, CM and Ryan, KG, In situ net primary productivity of an Antarctic fast ice bottom algal community, Aquatic Microbial Ecology, 21, (2) pp. 177-185. ISSN 0948-3055 (2000) [Refereed Article] http://ecite.utas.edu.au/20145 Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) Refereed Article PeerReviewed 2000 ftunivtasecite https://doi.org/10.3354/ame021177 2019-12-13T21:02:37Z Net primary production was measured in situ in an Antarctic fast ice bottom algal mat at Cape Evans, McMurdo Sound, Antarctica. Under-ice PAR irradiances between 18 November and 4 December 1997 were between 3 and 55 mol photons m-2 s-1. This produced a net oxygen export between 0.0084 and 0.0440 nmol O2 cm-2 s-1. Pmax was 0.034 nmol O2 cm-2 s-1, Ek was 14 mol photons m-2 s-1 the compensation point was approximately 2 mol photons m-2 s-1. These values are equivalent to a carbon-based production of 3.50 to 18.46 mg C m-2 h-1 and assimilation numbers of between 0.294 and 2.01 mg C mg-1 chl ah-1. Production levels on sunny days were so high that oxygen bubbles formed at the ice water interface and presumably contributed to the demise of the algal mat. Grazing by amphipods was also observed. While increasing net oxygen export was found to be strongly correlated with increasing irradiance, increasing under-ice current velocity was also found to increase production. The reduction in diffusive boundary layer thickness caused by increasing current velocity would have allowed both a more efficient transport of nutrients into the mat and a more efficient transport of oxygen away from the mat. Accumulation of sea ice algal biomass is not just a function of light but is also influenced by under-ice current velocity and possibly by oxygen build-up and grazing by amphipods and other invertebrates. In spite of the high under-ice irradiances reported from Cape Evans, loss mechanisms such as grazing and possibly oxygen toxicity were able to prevent the build-up of additional biomass. Article in Journal/Newspaper Antarc* Antarctic Antarctica McMurdo Sound Sea ice eCite UTAS (University of Tasmania) Antarctic McMurdo Sound Cape Evans ENVELOPE(161.550,161.550,-75.100,-75.100) Aquatic Microbial Ecology 21 177 185 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
spellingShingle |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) McMinn, A Ashworth, CM Ryan, KG In situ net primary productivity of an Antarctic fast ice bottom algal community |
topic_facet |
Biological Sciences Ecology Marine and Estuarine Ecology (incl. Marine Ichthyology) |
description |
Net primary production was measured in situ in an Antarctic fast ice bottom algal mat at Cape Evans, McMurdo Sound, Antarctica. Under-ice PAR irradiances between 18 November and 4 December 1997 were between 3 and 55 mol photons m-2 s-1. This produced a net oxygen export between 0.0084 and 0.0440 nmol O2 cm-2 s-1. Pmax was 0.034 nmol O2 cm-2 s-1, Ek was 14 mol photons m-2 s-1 the compensation point was approximately 2 mol photons m-2 s-1. These values are equivalent to a carbon-based production of 3.50 to 18.46 mg C m-2 h-1 and assimilation numbers of between 0.294 and 2.01 mg C mg-1 chl ah-1. Production levels on sunny days were so high that oxygen bubbles formed at the ice water interface and presumably contributed to the demise of the algal mat. Grazing by amphipods was also observed. While increasing net oxygen export was found to be strongly correlated with increasing irradiance, increasing under-ice current velocity was also found to increase production. The reduction in diffusive boundary layer thickness caused by increasing current velocity would have allowed both a more efficient transport of nutrients into the mat and a more efficient transport of oxygen away from the mat. Accumulation of sea ice algal biomass is not just a function of light but is also influenced by under-ice current velocity and possibly by oxygen build-up and grazing by amphipods and other invertebrates. In spite of the high under-ice irradiances reported from Cape Evans, loss mechanisms such as grazing and possibly oxygen toxicity were able to prevent the build-up of additional biomass. |
format |
Article in Journal/Newspaper |
author |
McMinn, A Ashworth, CM Ryan, KG |
author_facet |
McMinn, A Ashworth, CM Ryan, KG |
author_sort |
McMinn, A |
title |
In situ net primary productivity of an Antarctic fast ice bottom algal community |
title_short |
In situ net primary productivity of an Antarctic fast ice bottom algal community |
title_full |
In situ net primary productivity of an Antarctic fast ice bottom algal community |
title_fullStr |
In situ net primary productivity of an Antarctic fast ice bottom algal community |
title_full_unstemmed |
In situ net primary productivity of an Antarctic fast ice bottom algal community |
title_sort |
in situ net primary productivity of an antarctic fast ice bottom algal community |
publisher |
Inter-Research |
publishDate |
2000 |
url |
https://doi.org/10.3354/ame021177 http://ecite.utas.edu.au/20145 |
long_lat |
ENVELOPE(161.550,161.550,-75.100,-75.100) |
geographic |
Antarctic McMurdo Sound Cape Evans |
geographic_facet |
Antarctic McMurdo Sound Cape Evans |
genre |
Antarc* Antarctic Antarctica McMurdo Sound Sea ice |
genre_facet |
Antarc* Antarctic Antarctica McMurdo Sound Sea ice |
op_relation |
http://ecite.utas.edu.au/20145/1/McMinn 2000.pdf http://dx.doi.org/10.3354/ame021177 McMinn, A and Ashworth, CM and Ryan, KG, In situ net primary productivity of an Antarctic fast ice bottom algal community, Aquatic Microbial Ecology, 21, (2) pp. 177-185. ISSN 0948-3055 (2000) [Refereed Article] http://ecite.utas.edu.au/20145 |
op_doi |
https://doi.org/10.3354/ame021177 |
container_title |
Aquatic Microbial Ecology |
container_volume |
21 |
container_start_page |
177 |
op_container_end_page |
185 |
_version_ |
1766267507802374144 |