Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves
The response of phytoplankton to variations in the light regime was studied during the VULCAN and ACDA cruises in the Antarctic. Unenriched batch cultures of 12–19 days' duration reached chl concentrations of 10–50 μg−1 and exhibited exponential growth rates, with the maximal rate being 0.41 do...
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1986
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fthighwire:oai:open-archive.highwire.org:plankt:8/3/459 2023-05-15T14:03:03+02:00 Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves Sakshaug, Egil Holm-Hansen, Osmund 1986-01-01 00:00:00.0 text/html http://plankt.oxfordjournals.org/cgi/content/short/8/3/459 https://doi.org/10.1093/plankt/8.3.459 en eng Oxford University Press http://plankt.oxfordjournals.org/cgi/content/short/8/3/459 http://dx.doi.org/10.1093/plankt/8.3.459 Copyright (C) 1986, Oxford University Press Articles TEXT 1986 fthighwire https://doi.org/10.1093/plankt/8.3.459 2015-02-28T21:56:11Z The response of phytoplankton to variations in the light regime was studied during the VULCAN and ACDA cruises in the Antarctic. Unenriched batch cultures of 12–19 days' duration reached chl concentrations of 10–50 μg−1 and exhibited exponential growth rates, with the maximal rate being 0.41 doubl, day−1. Ice edge algae exhibited maximum growth rates at photon flux densities (PFD) of 30–100 μE m−2S−1 and the growth rate was reduced by about 30% at 500–1000 μE m−2S−1 The chl/C ratio ranged between 0.004 and 0.018, with the lowest ratios at PFDs above 500 μE m−2S−1 chl/C ratios were also below maximum at PFDs below 40–50 μE m−2S−1 The C:N:P ratios were close to the Redfield ratios; the Si/C ratio averaged 0.16 (atoms), and the ATP/C ratio averaged from 0.0024 to 0.0050 in different culture senes. When thawed after having been frozen for 10 days, shade-adapted cultures were in a much better condition than sun-adapted ones. P versus I data showed that the maximum assimilation number varied from 0.75 to 4.4 μg C (μg chl)−1h−1. It varied inversely with the chl/C ratio; therefore the maximum carbon turnover rate varied little between samples (0.024/0.035 h−1). Low biomass communities exhibited relatively high values for α (the initial slope of P versus I curves), low values for 1 sat (160–330 μE m−2S−1), and they were susceptible to photoinhibition. In contrast, communities dominated by Odontella weissflogii exhibited low values for α, a high value for I sat (560 μE m−2S−1 and they tolerated high PFDs. The photo-adaptational status of the phytoplankton in natural water samples is discussed relative to the profile of water column stability and mixing processes. Text Antarc* Antarctic HighWire Press (Stanford University) Antarctic The Antarctic Journal of Plankton Research 8 3 459 473 |
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Articles Sakshaug, Egil Holm-Hansen, Osmund Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
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Articles |
description |
The response of phytoplankton to variations in the light regime was studied during the VULCAN and ACDA cruises in the Antarctic. Unenriched batch cultures of 12–19 days' duration reached chl concentrations of 10–50 μg−1 and exhibited exponential growth rates, with the maximal rate being 0.41 doubl, day−1. Ice edge algae exhibited maximum growth rates at photon flux densities (PFD) of 30–100 μE m−2S−1 and the growth rate was reduced by about 30% at 500–1000 μE m−2S−1 The chl/C ratio ranged between 0.004 and 0.018, with the lowest ratios at PFDs above 500 μE m−2S−1 chl/C ratios were also below maximum at PFDs below 40–50 μE m−2S−1 The C:N:P ratios were close to the Redfield ratios; the Si/C ratio averaged 0.16 (atoms), and the ATP/C ratio averaged from 0.0024 to 0.0050 in different culture senes. When thawed after having been frozen for 10 days, shade-adapted cultures were in a much better condition than sun-adapted ones. P versus I data showed that the maximum assimilation number varied from 0.75 to 4.4 μg C (μg chl)−1h−1. It varied inversely with the chl/C ratio; therefore the maximum carbon turnover rate varied little between samples (0.024/0.035 h−1). Low biomass communities exhibited relatively high values for α (the initial slope of P versus I curves), low values for 1 sat (160–330 μE m−2S−1), and they were susceptible to photoinhibition. In contrast, communities dominated by Odontella weissflogii exhibited low values for α, a high value for I sat (560 μE m−2S−1 and they tolerated high PFDs. The photo-adaptational status of the phytoplankton in natural water samples is discussed relative to the profile of water column stability and mixing processes. |
format |
Text |
author |
Sakshaug, Egil Holm-Hansen, Osmund |
author_facet |
Sakshaug, Egil Holm-Hansen, Osmund |
author_sort |
Sakshaug, Egil |
title |
Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
title_short |
Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
title_full |
Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
title_fullStr |
Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
title_full_unstemmed |
Photoadaptation in Antarctic phytopfankton: variations in growth rate, chemical composition and P versus I curves |
title_sort |
photoadaptation in antarctic phytopfankton: variations in growth rate, chemical composition and p versus i curves |
publisher |
Oxford University Press |
publishDate |
1986 |
url |
http://plankt.oxfordjournals.org/cgi/content/short/8/3/459 https://doi.org/10.1093/plankt/8.3.459 |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://plankt.oxfordjournals.org/cgi/content/short/8/3/459 http://dx.doi.org/10.1093/plankt/8.3.459 |
op_rights |
Copyright (C) 1986, Oxford University Press |
op_doi |
https://doi.org/10.1093/plankt/8.3.459 |
container_title |
Journal of Plankton Research |
container_volume |
8 |
container_issue |
3 |
container_start_page |
459 |
op_container_end_page |
473 |
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1766273531565309952 |