Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica)
The nutrient status of two common Antarctic diatoms (Corethron criophilum and Thalassiosira cf. antarctica) was analysed by studying the growth response in enrichment bioassays and by estimates of the cell quotas of Si, N and P after size-fractionation of net plankton samples Corethron had higher bi...
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1991
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fthighwire:oai:open-archive.highwire.org:plankt:13/1/61 2023-05-15T14:01:23+02:00 Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) Sommer, Ulrich 1991-01-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/13/1/61 https://doi.org/10.1093/plankt/13.1.61 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/13/1/61 http://dx.doi.org/10.1093/plankt/13.1.61 Copyright (C) 1991, Oxford University Press Articles TEXT 1991 fthighwire https://doi.org/10.1093/plankt/13.1.61 2007-06-24T14:39:52Z The nutrient status of two common Antarctic diatoms (Corethron criophilum and Thalassiosira cf. antarctica) was analysed by studying the growth response in enrichment bioassays and by estimates of the cell quotas of Si, N and P after size-fractionation of net plankton samples Corethron had higher biomass-specific N-quotas; Si- and P-quotas were quite similar between both species. Corethron was Si-limited in five enrichment experiments and not nutrient limited in five experiments. Thalassiosira was not nutrient limited in six experiments, N-hmited in four experiments and Si-limited in one experiment Droop-kinetics of Si-limited growth of Corethron and of N-hmited growth of Thalassiosira were obtained by combining the growth rates in the bioassays and the cell quotas from the natural populations. The minimal Si-quota of Corethron was 0 041 mol Si/mol C, the saturating cell quota was 0.158 mol Si/mol C respectively The minimal N-quota of Thalassiosira was 0 0223 mol N/mol C, the saturating cell quota was 0.208 mol N/mol C Corethron was N-saturated at cell quotas of >0 106 mol N/mol C; Thalassiosira was Si-saturated at cell quotas of <0 132 mol Si/mol C. As the better competitor for N and the poorer one for Si, Corethron became more important with increasing Si N ratios, while Thalassiosira became more important with decreasing Si:N ratios in the water Text Antarc* Antarctic Antarctica HighWire Press (Stanford University) Antarctic Journal of Plankton Research 13 1 61 75 |
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Articles Sommer, Ulrich Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
topic_facet |
Articles |
description |
The nutrient status of two common Antarctic diatoms (Corethron criophilum and Thalassiosira cf. antarctica) was analysed by studying the growth response in enrichment bioassays and by estimates of the cell quotas of Si, N and P after size-fractionation of net plankton samples Corethron had higher biomass-specific N-quotas; Si- and P-quotas were quite similar between both species. Corethron was Si-limited in five enrichment experiments and not nutrient limited in five experiments. Thalassiosira was not nutrient limited in six experiments, N-hmited in four experiments and Si-limited in one experiment Droop-kinetics of Si-limited growth of Corethron and of N-hmited growth of Thalassiosira were obtained by combining the growth rates in the bioassays and the cell quotas from the natural populations. The minimal Si-quota of Corethron was 0 041 mol Si/mol C, the saturating cell quota was 0.158 mol Si/mol C respectively The minimal N-quota of Thalassiosira was 0 0223 mol N/mol C, the saturating cell quota was 0.208 mol N/mol C Corethron was N-saturated at cell quotas of >0 106 mol N/mol C; Thalassiosira was Si-saturated at cell quotas of <0 132 mol Si/mol C. As the better competitor for N and the poorer one for Si, Corethron became more important with increasing Si N ratios, while Thalassiosira became more important with decreasing Si:N ratios in the water |
format |
Text |
author |
Sommer, Ulrich |
author_facet |
Sommer, Ulrich |
author_sort |
Sommer, Ulrich |
title |
Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
title_short |
Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
title_full |
Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
title_fullStr |
Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
title_full_unstemmed |
Comparative nutrient status and competitive interactions of two Antarctic diatoms (Corethron criophilum and Thalassiosira antarctica) |
title_sort |
comparative nutrient status and competitive interactions of two antarctic diatoms (corethron criophilum and thalassiosira antarctica) |
publisher |
Oxford University Press |
publishDate |
1991 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/13/1/61 https://doi.org/10.1093/plankt/13.1.61 |
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Antarctic |
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Antarctic |
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Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/13/1/61 http://dx.doi.org/10.1093/plankt/13.1.61 |
op_rights |
Copyright (C) 1991, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/13.1.61 |
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Journal of Plankton Research |
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13 |
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1 |
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61 |
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75 |
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1766271192574984192 |