Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt)
The impacts of different CO2 concentrations on the growth, physiology and ultrastructure of noncalcifying microalga Chaetoceros gracilis F.Schütt (Diatom) were studied. We incubated Ch. gracilis under different CO2 concentrations, preindustrial and current ambient atmospheric concentrations (285 and...
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ftdoajarticles:oai:doaj.org/article:8875dbbeaa7a49b6bdc24ab9c6e08d13 2023-05-15T17:50:59+02:00 Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) Hanan M. Khairy Nayrah A. Shaltout Mona F. El-Naggar Naglaa A. El-Naggar 2014-01-01T00:00:00Z https://doi.org/10.1016/j.ejar.2014.08.002 https://doaj.org/article/8875dbbeaa7a49b6bdc24ab9c6e08d13 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1687428514000703 https://doaj.org/toc/1687-4285 1687-4285 doi:10.1016/j.ejar.2014.08.002 https://doaj.org/article/8875dbbeaa7a49b6bdc24ab9c6e08d13 Egyptian Journal of Aquatic Research, Vol 40, Iss 3, Pp 243-250 (2014) Ocean acidification Carbonate chemistry Nutrient salts Chaetoceros gracilis Growth Protein Carbohydrate Lipids TEM Aquaculture. Fisheries. Angling SH1-691 Environmental sciences GE1-350 article 2014 ftdoajarticles https://doi.org/10.1016/j.ejar.2014.08.002 2022-12-31T00:38:12Z The impacts of different CO2 concentrations on the growth, physiology and ultrastructure of noncalcifying microalga Chaetoceros gracilis F.Schütt (Diatom) were studied. We incubated Ch. gracilis under different CO2 concentrations, preindustrial and current ambient atmospheric concentrations (285 and 385 μatm, respectively) or predicted year-2100 CO2 levels (550, 750 and 1050 μatm) in continuous culture conditions. The growth of Ch. gracilis measured as cell number was decreased by increasing the pCO2 concentration from nowadays concentration (385 μatm) to 1050 μatm. The lowest percentage changes of oxidizable organic matter, nitrite, nitrate, phosphate and silicate were recorded at a higher pCO2 (1050 μatm), and this is in consistence with the lowest recorded cell number indicating unsuitable conditions for the growth of Ch. gracilis. The minimum cell numbers obtained at higher levels of CO2 clearly demonstrate that, low improvement occurred when the carbon level was raised. This was confirmed by a highly negative correlation between cell number and carbon dioxide partial pressure (r = −0.742, p ⩽ 0.05). On the other hand, highest growth rate at pCO2 = 385 μatm was also confirmed by the maximum uptake of nutrient salts (NO3 = 68.96 μmol.l−1, PO4 = 29.75 μmol.l−1, Si2O3 = 36.99 μmol.l−1). Total protein, carbohydrate and lipid composition showed significant differences (p ⩽ 0.05) at different carbon dioxide concentrations during the exponential growth phase (day 8). Transmission Electron Microscopy of Ch. gracilis showed enlargement of the cell, chloroplast damage, disorganization and disintegration of thylakoid membranes; cell lysis occurs at a higher CO2 concentration (1050 μatm). It is concluded from this regression equation and from the results that the growth of Ch. gracilis is expected to decrease by increasing pCO2 and increasing ocean acidification. Article in Journal/Newspaper Ocean acidification Directory of Open Access Journals: DOAJ Articles The Egyptian Journal of Aquatic Research 40 3 243 250 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Ocean acidification Carbonate chemistry Nutrient salts Chaetoceros gracilis Growth Protein Carbohydrate Lipids TEM Aquaculture. Fisheries. Angling SH1-691 Environmental sciences GE1-350 |
spellingShingle |
Ocean acidification Carbonate chemistry Nutrient salts Chaetoceros gracilis Growth Protein Carbohydrate Lipids TEM Aquaculture. Fisheries. Angling SH1-691 Environmental sciences GE1-350 Hanan M. Khairy Nayrah A. Shaltout Mona F. El-Naggar Naglaa A. El-Naggar Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
topic_facet |
Ocean acidification Carbonate chemistry Nutrient salts Chaetoceros gracilis Growth Protein Carbohydrate Lipids TEM Aquaculture. Fisheries. Angling SH1-691 Environmental sciences GE1-350 |
description |
The impacts of different CO2 concentrations on the growth, physiology and ultrastructure of noncalcifying microalga Chaetoceros gracilis F.Schütt (Diatom) were studied. We incubated Ch. gracilis under different CO2 concentrations, preindustrial and current ambient atmospheric concentrations (285 and 385 μatm, respectively) or predicted year-2100 CO2 levels (550, 750 and 1050 μatm) in continuous culture conditions. The growth of Ch. gracilis measured as cell number was decreased by increasing the pCO2 concentration from nowadays concentration (385 μatm) to 1050 μatm. The lowest percentage changes of oxidizable organic matter, nitrite, nitrate, phosphate and silicate were recorded at a higher pCO2 (1050 μatm), and this is in consistence with the lowest recorded cell number indicating unsuitable conditions for the growth of Ch. gracilis. The minimum cell numbers obtained at higher levels of CO2 clearly demonstrate that, low improvement occurred when the carbon level was raised. This was confirmed by a highly negative correlation between cell number and carbon dioxide partial pressure (r = −0.742, p ⩽ 0.05). On the other hand, highest growth rate at pCO2 = 385 μatm was also confirmed by the maximum uptake of nutrient salts (NO3 = 68.96 μmol.l−1, PO4 = 29.75 μmol.l−1, Si2O3 = 36.99 μmol.l−1). Total protein, carbohydrate and lipid composition showed significant differences (p ⩽ 0.05) at different carbon dioxide concentrations during the exponential growth phase (day 8). Transmission Electron Microscopy of Ch. gracilis showed enlargement of the cell, chloroplast damage, disorganization and disintegration of thylakoid membranes; cell lysis occurs at a higher CO2 concentration (1050 μatm). It is concluded from this regression equation and from the results that the growth of Ch. gracilis is expected to decrease by increasing pCO2 and increasing ocean acidification. |
format |
Article in Journal/Newspaper |
author |
Hanan M. Khairy Nayrah A. Shaltout Mona F. El-Naggar Naglaa A. El-Naggar |
author_facet |
Hanan M. Khairy Nayrah A. Shaltout Mona F. El-Naggar Naglaa A. El-Naggar |
author_sort |
Hanan M. Khairy |
title |
Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
title_short |
Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
title_full |
Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
title_fullStr |
Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
title_full_unstemmed |
Impact of elevated CO2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (Chaetoceros gracilis F.Schütt) |
title_sort |
impact of elevated co2 concentrations on the growth and ultrastructure of non-calcifying marine diatom (chaetoceros gracilis f.schütt) |
publisher |
Elsevier |
publishDate |
2014 |
url |
https://doi.org/10.1016/j.ejar.2014.08.002 https://doaj.org/article/8875dbbeaa7a49b6bdc24ab9c6e08d13 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Egyptian Journal of Aquatic Research, Vol 40, Iss 3, Pp 243-250 (2014) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1687428514000703 https://doaj.org/toc/1687-4285 1687-4285 doi:10.1016/j.ejar.2014.08.002 https://doaj.org/article/8875dbbeaa7a49b6bdc24ab9c6e08d13 |
op_doi |
https://doi.org/10.1016/j.ejar.2014.08.002 |
container_title |
The Egyptian Journal of Aquatic Research |
container_volume |
40 |
container_issue |
3 |
container_start_page |
243 |
op_container_end_page |
250 |
_version_ |
1766157947892662272 |