Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica
We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including some ponds with basal brines created by meromictic stratification. Primary production ranged from 1.07 to 65.72 mgC m ^−3 h ^−1 in surface waters....
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ftdoajarticles:oai:doaj.org/article:25c93f609eed452faaf747e9d7756542 2023-09-05T13:12:23+02:00 Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica Brian K Sorrell Ian Hawes Karl Safi 2013-01-01T00:00:00Z https://doi.org/10.1088/1748-9326/8/3/035043 https://doaj.org/article/25c93f609eed452faaf747e9d7756542 EN eng IOP Publishing https://doi.org/10.1088/1748-9326/8/3/035043 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/8/3/035043 1748-9326 https://doaj.org/article/25c93f609eed452faaf747e9d7756542 Environmental Research Letters, Vol 8, Iss 3, p 035043 (2013) nutrient limitation photosynthesis respiration regression trees thymidine leucine Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 article 2013 ftdoajarticles https://doi.org/10.1088/1748-9326/8/3/035043 2023-08-13T00:37:31Z We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including some ponds with basal brines created by meromictic stratification. Primary production ranged from 1.07 to 65.72 mgC m ^−3 h ^−1 in surface waters. In stratified ponds primary production was always more than ten times higher in basal brines than in the corresponding mixolimnion. Regression tree analysis ( r ^2 = 0.80) identified inorganic nitrogen (as ${\mathrm{NH}}_{4}^{+}$ ) as the main factor limiting planktonic primary production. However, there was also evidence of inorganic carbon co-limitation of photosynthesis in some of the more oligotrophic waters. Neither C nor N limited carbon fixation at [NH _4 –N] > 50 mg m ^−3 , with photoinhibition the factor most likely limiting photosynthesis under such conditions. Primary production was the only factor significantly correlated to bacterial production and the relationship ( r ^2 = 0.56) was non-linear. Nitrogen limitation and tight coupling of planktonic primary and bacterial production is surprising in these ponds, as all have large pools of dissolved organic carbon (1.2–260 g m ^−3 ) and organic nitrogen (all >130 mg m ^−3 ). The dissolved pools of organic carbon and nitrogen appear to be recalcitrant and bacterial production to be constrained by limited release of labile organics from phytoplankton. Article in Journal/Newspaper Antarc* Antarctica Ice Shelf McMurdo Ice Shelf Directory of Open Access Journals: DOAJ Articles McMurdo Ice Shelf ENVELOPE(166.500,166.500,-78.000,-78.000) Environmental Research Letters 8 3 035043 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
nutrient limitation photosynthesis respiration regression trees thymidine leucine Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
spellingShingle |
nutrient limitation photosynthesis respiration regression trees thymidine leucine Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 Brian K Sorrell Ian Hawes Karl Safi Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
topic_facet |
nutrient limitation photosynthesis respiration regression trees thymidine leucine Environmental technology. Sanitary engineering TD1-1066 Environmental sciences GE1-350 Science Q Physics QC1-999 |
description |
We compared planktonic primary and secondary production across twenty meltwater ponds on the surface of the McMurdo Ice Shelf in January 2007, including some ponds with basal brines created by meromictic stratification. Primary production ranged from 1.07 to 65.72 mgC m ^−3 h ^−1 in surface waters. In stratified ponds primary production was always more than ten times higher in basal brines than in the corresponding mixolimnion. Regression tree analysis ( r ^2 = 0.80) identified inorganic nitrogen (as ${\mathrm{NH}}_{4}^{+}$ ) as the main factor limiting planktonic primary production. However, there was also evidence of inorganic carbon co-limitation of photosynthesis in some of the more oligotrophic waters. Neither C nor N limited carbon fixation at [NH _4 –N] > 50 mg m ^−3 , with photoinhibition the factor most likely limiting photosynthesis under such conditions. Primary production was the only factor significantly correlated to bacterial production and the relationship ( r ^2 = 0.56) was non-linear. Nitrogen limitation and tight coupling of planktonic primary and bacterial production is surprising in these ponds, as all have large pools of dissolved organic carbon (1.2–260 g m ^−3 ) and organic nitrogen (all >130 mg m ^−3 ). The dissolved pools of organic carbon and nitrogen appear to be recalcitrant and bacterial production to be constrained by limited release of labile organics from phytoplankton. |
format |
Article in Journal/Newspaper |
author |
Brian K Sorrell Ian Hawes Karl Safi |
author_facet |
Brian K Sorrell Ian Hawes Karl Safi |
author_sort |
Brian K Sorrell |
title |
Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
title_short |
Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
title_full |
Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
title_fullStr |
Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
title_full_unstemmed |
Nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the McMurdo Ice Shelf, Antarctica |
title_sort |
nitrogen and carbon limitation of planktonic primary production and phytoplankton–bacterioplankton coupling in ponds on the mcmurdo ice shelf, antarctica |
publisher |
IOP Publishing |
publishDate |
2013 |
url |
https://doi.org/10.1088/1748-9326/8/3/035043 https://doaj.org/article/25c93f609eed452faaf747e9d7756542 |
long_lat |
ENVELOPE(166.500,166.500,-78.000,-78.000) |
geographic |
McMurdo Ice Shelf |
geographic_facet |
McMurdo Ice Shelf |
genre |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf |
genre_facet |
Antarc* Antarctica Ice Shelf McMurdo Ice Shelf |
op_source |
Environmental Research Letters, Vol 8, Iss 3, p 035043 (2013) |
op_relation |
https://doi.org/10.1088/1748-9326/8/3/035043 https://doaj.org/toc/1748-9326 doi:10.1088/1748-9326/8/3/035043 1748-9326 https://doaj.org/article/25c93f609eed452faaf747e9d7756542 |
op_doi |
https://doi.org/10.1088/1748-9326/8/3/035043 |
container_title |
Environmental Research Letters |
container_volume |
8 |
container_issue |
3 |
container_start_page |
035043 |
_version_ |
1776200109198934016 |