Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition
A natural marine phytoplankton assemblage from a coastal environment of Antarctica was experimentally exposed to low salinity sea water (30 vs 34 in the control) during 8. days in order to study their physiological and community responses to hypoosmotic stress conditions. Hypoosmotic conditions favo...
Published in: | Journal of Experimental Marine Biology and Ecology |
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ftconicet:oai:ri.conicet.gov.ar:11336/38822 2023-10-09T21:45:04+02:00 Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition Hernando, Marcelo Pablo Schloss, Irene Ruth Malanga, Gabriela Fabiana Almandoz, Gaston Osvaldo Ferreyra, Gustavo Adolfo Aguiar, María Belén Puntarulo, Susana Ángela application/pdf http://hdl.handle.net/11336/38822 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2015.02.012 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022098115000428 http://hdl.handle.net/11336/38822 Hernando, Marcelo Pablo; Schloss, Irene Ruth; Malanga, Gabriela Fabiana; Almandoz, Gaston Osvaldo; Ferreyra, Gustavo Adolfo; et al.; Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition; Elsevier Science; Journal of Experimental Marine Biology and Ecology; 466; 5-2015; 110-119 0022-0981 CONICET Digital CONICET info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ Antarctica Dcfh-Da Diatoms Meltwater Αt Βc https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 info:eu-repo/semantics/article info:ar-repo/semantics/artículo info:eu-repo/semantics/publishedVersion ftconicet https://doi.org/10.1016/j.jembe.2015.02.012 2023-09-24T19:31:51Z A natural marine phytoplankton assemblage from a coastal environment of Antarctica was experimentally exposed to low salinity sea water (30 vs 34 in the control) during 8. days in order to study their physiological and community responses to hypoosmotic stress conditions. Hypoosmotic conditions favour water influx into the cells, which results in increased turgor pressure and increased oxidative stress. This stress is linked to a number of other cellular toxic processes, including damages to proteins, enzyme inactivation and DNA breakage. Inhibition of the instantaneous growth rate started after 48. h exposure to low salinity, but at the end of experiment, growth was significantly higher in the low than in the normal (control) salinity treatment. Hypoosmotic conditions prevented phytoplankton biomass accumulation, as evidenced by reduced Chlorophyll-a concentrations as compared to the control treatment. However, in terms of cell numbers and species composition, we observed a gradual replacement of big centric by small pennate diatoms, which became dominant by the end of the experiment. In addition, the content of reactive oxygen species (ROS) and 2-thiobarbituric acid-reactive substances (TBARS), which are indicative of oxidative stress, were studied. In the low salinity treatments, ROS concentrations were significantly higher than control values on days 4 and 6, decreasing thereafter to nearly initial values. TBARS content increased during the first 48. h and then decreased until around day 0 values. This coincided with significant increased values of the antioxidants α-tocopherol and β-carotene in low salinity treatments over the control. These results suggest the existence of protection mechanisms against lipid peroxidation, and lead to the conclusion that the response to stress is species-specific, so that at the community level a change in the relative abundance of phytoplankton taxa appears as a response to hypoosmotic conditions. This could have important consequences for the trophic food web dynamics in ... Article in Journal/Newspaper Antarc* Antarctic Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Journal of Experimental Marine Biology and Ecology 466 110 119 |
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Open Polar |
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CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Antarctica Dcfh-Da Diatoms Meltwater Αt Βc https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Antarctica Dcfh-Da Diatoms Meltwater Αt Βc https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Hernando, Marcelo Pablo Schloss, Irene Ruth Malanga, Gabriela Fabiana Almandoz, Gaston Osvaldo Ferreyra, Gustavo Adolfo Aguiar, María Belén Puntarulo, Susana Ángela Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
topic_facet |
Antarctica Dcfh-Da Diatoms Meltwater Αt Βc https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
A natural marine phytoplankton assemblage from a coastal environment of Antarctica was experimentally exposed to low salinity sea water (30 vs 34 in the control) during 8. days in order to study their physiological and community responses to hypoosmotic stress conditions. Hypoosmotic conditions favour water influx into the cells, which results in increased turgor pressure and increased oxidative stress. This stress is linked to a number of other cellular toxic processes, including damages to proteins, enzyme inactivation and DNA breakage. Inhibition of the instantaneous growth rate started after 48. h exposure to low salinity, but at the end of experiment, growth was significantly higher in the low than in the normal (control) salinity treatment. Hypoosmotic conditions prevented phytoplankton biomass accumulation, as evidenced by reduced Chlorophyll-a concentrations as compared to the control treatment. However, in terms of cell numbers and species composition, we observed a gradual replacement of big centric by small pennate diatoms, which became dominant by the end of the experiment. In addition, the content of reactive oxygen species (ROS) and 2-thiobarbituric acid-reactive substances (TBARS), which are indicative of oxidative stress, were studied. In the low salinity treatments, ROS concentrations were significantly higher than control values on days 4 and 6, decreasing thereafter to nearly initial values. TBARS content increased during the first 48. h and then decreased until around day 0 values. This coincided with significant increased values of the antioxidants α-tocopherol and β-carotene in low salinity treatments over the control. These results suggest the existence of protection mechanisms against lipid peroxidation, and lead to the conclusion that the response to stress is species-specific, so that at the community level a change in the relative abundance of phytoplankton taxa appears as a response to hypoosmotic conditions. This could have important consequences for the trophic food web dynamics in ... |
format |
Article in Journal/Newspaper |
author |
Hernando, Marcelo Pablo Schloss, Irene Ruth Malanga, Gabriela Fabiana Almandoz, Gaston Osvaldo Ferreyra, Gustavo Adolfo Aguiar, María Belén Puntarulo, Susana Ángela |
author_facet |
Hernando, Marcelo Pablo Schloss, Irene Ruth Malanga, Gabriela Fabiana Almandoz, Gaston Osvaldo Ferreyra, Gustavo Adolfo Aguiar, María Belén Puntarulo, Susana Ángela |
author_sort |
Hernando, Marcelo Pablo |
title |
Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
title_short |
Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
title_full |
Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
title_fullStr |
Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
title_full_unstemmed |
Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition |
title_sort |
effects of salinity changes on coastal antarctic phytoplankton physiology and assemblage composition |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/38822 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2015.02.012 info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0022098115000428 http://hdl.handle.net/11336/38822 Hernando, Marcelo Pablo; Schloss, Irene Ruth; Malanga, Gabriela Fabiana; Almandoz, Gaston Osvaldo; Ferreyra, Gustavo Adolfo; et al.; Effects of salinity changes on coastal Antarctic phytoplankton physiology and assemblage composition; Elsevier Science; Journal of Experimental Marine Biology and Ecology; 466; 5-2015; 110-119 0022-0981 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.jembe.2015.02.012 |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
466 |
container_start_page |
110 |
op_container_end_page |
119 |
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1779315753830318080 |