Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica
Coastal phytoplankton assemblages from Potter Cove in Antarctica were exposed to low salinity (S-) and hightemperature (T+) conditions to simulate oceanic changes resulting from global warming. The treatments were:low salinity (30) and high temperature (S-T+); low salinity and ambient temperature (1...
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Online Access: | http://hdl.handle.net/11336/127140 |
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ftconicet:oai:ri.conicet.gov.ar:11336/127140 2023-10-09T21:47:09+02:00 Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica Hernando, Marcelo Pablo Varela, Diana E. Malanga, Gabriela Almandoz, Gaston Osvaldo Schloss, Irene Ruth application/pdf http://hdl.handle.net/11336/127140 eng eng Elsevier Science info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0022098119303521 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2020.151400 http://hdl.handle.net/11336/127140 Hernando, Marcelo Pablo; Varela, Diana E.; Malanga, Gabriela; Almandoz, Gaston Osvaldo; Schloss, Irene Ruth; Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica; Elsevier Science; Journal of Experimental Marine Biology and Ecology; 530-531; 9-2020; 151400- 0022-0981 CONICET Digital CONICET info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ Phytoplankton assemblages Antarctica High temperature Low salinity Antioxidant Biomass Nutrients 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.2020.151400 2023-09-24T19:57:05Z Coastal phytoplankton assemblages from Potter Cove in Antarctica were exposed to low salinity (S-) and hightemperature (T+) conditions to simulate oceanic changes resulting from global warming. The treatments were:low salinity (30) and high temperature (S-T+); low salinity and ambient temperature (1?2 °C) (S-T0); ambientsalinity (34) and increased temperature (4?5 °C) (S0T+) and ambient salinity with ambient temperature(control, S0T0). Experiments were conducted in 100-L microcosms and monitored for 6 days. Compared to thecontrol treatment, micro-size diatoms (25?50 ìm) dominated the phytoplankton assemblages while prasinophyceaewere less abundant at the end of the S-T+ and S0T+ treatments. Nano-size diatoms (10?20 ìm) alsoincreased significantly at the end of the experiment but only when exposed to S0T+. In S- treatments, theproduction of reactive oxygen/ nitrogen species (ROS/RNS) increased while phytoplankton biomass decreased.Under T+ conditions, the production of ROS/RNS was significantly lower than in T0 treatments. Throughout theexperiment, á-Tocopherol (á-T) consumption may have prevented lipid damage, allowing for increases inphotosynthetic rate and growth when nutrients concentrations were sufficiently high. Our results indicate thatan increase in temperature can compensate for the lipid damage produced by low salinity, and stimulate carbonuptake in both conditions. This study demonstrated that the final composition of phytoplankton assemblages inall experimental treatments was strongly influenced by the original composition. Future changes in naturalphytoplankton assemblages in Antarctic coastal waters will therefore depend on the planktonic species present atthe time of the perturbation, which can strongly impact energy flow along food webs and the magnitude ofcarbon and nutrient fluxes in Antarctic waters. Fil: Hernando, Marcelo Pablo. Comisión Nacional de Energía Atómica; Argentina Fil: Varela, Diana E. University of Victoria; Canadá Fil: Malanga, Gabriela. Universidad Nacional de La Plata. ... Article in Journal/Newspaper Antarc* Antarctic Antarctica CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) Antarctic Potter Cove Argentina Pablo ENVELOPE(-63.717,-63.717,-64.283,-64.283) Varela ENVELOPE(-60.583,-60.583,-62.933,-62.933) Journal of Experimental Marine Biology and Ecology 530-531 151400 |
institution |
Open Polar |
collection |
CONICET Digital (Consejo Nacional de Investigaciones Científicas y Técnicas) |
op_collection_id |
ftconicet |
language |
English |
topic |
Phytoplankton assemblages Antarctica High temperature Low salinity Antioxidant Biomass Nutrients https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
spellingShingle |
Phytoplankton assemblages Antarctica High temperature Low salinity Antioxidant Biomass Nutrients https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 Hernando, Marcelo Pablo Varela, Diana E. Malanga, Gabriela Almandoz, Gaston Osvaldo Schloss, Irene Ruth Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
topic_facet |
Phytoplankton assemblages Antarctica High temperature Low salinity Antioxidant Biomass Nutrients https://purl.org/becyt/ford/1.6 https://purl.org/becyt/ford/1 |
description |
Coastal phytoplankton assemblages from Potter Cove in Antarctica were exposed to low salinity (S-) and hightemperature (T+) conditions to simulate oceanic changes resulting from global warming. The treatments were:low salinity (30) and high temperature (S-T+); low salinity and ambient temperature (1?2 °C) (S-T0); ambientsalinity (34) and increased temperature (4?5 °C) (S0T+) and ambient salinity with ambient temperature(control, S0T0). Experiments were conducted in 100-L microcosms and monitored for 6 days. Compared to thecontrol treatment, micro-size diatoms (25?50 ìm) dominated the phytoplankton assemblages while prasinophyceaewere less abundant at the end of the S-T+ and S0T+ treatments. Nano-size diatoms (10?20 ìm) alsoincreased significantly at the end of the experiment but only when exposed to S0T+. In S- treatments, theproduction of reactive oxygen/ nitrogen species (ROS/RNS) increased while phytoplankton biomass decreased.Under T+ conditions, the production of ROS/RNS was significantly lower than in T0 treatments. Throughout theexperiment, á-Tocopherol (á-T) consumption may have prevented lipid damage, allowing for increases inphotosynthetic rate and growth when nutrients concentrations were sufficiently high. Our results indicate thatan increase in temperature can compensate for the lipid damage produced by low salinity, and stimulate carbonuptake in both conditions. This study demonstrated that the final composition of phytoplankton assemblages inall experimental treatments was strongly influenced by the original composition. Future changes in naturalphytoplankton assemblages in Antarctic coastal waters will therefore depend on the planktonic species present atthe time of the perturbation, which can strongly impact energy flow along food webs and the magnitude ofcarbon and nutrient fluxes in Antarctic waters. Fil: Hernando, Marcelo Pablo. Comisión Nacional de Energía Atómica; Argentina Fil: Varela, Diana E. University of Victoria; Canadá Fil: Malanga, Gabriela. Universidad Nacional de La Plata. ... |
format |
Article in Journal/Newspaper |
author |
Hernando, Marcelo Pablo Varela, Diana E. Malanga, Gabriela Almandoz, Gaston Osvaldo Schloss, Irene Ruth |
author_facet |
Hernando, Marcelo Pablo Varela, Diana E. Malanga, Gabriela Almandoz, Gaston Osvaldo Schloss, Irene Ruth |
author_sort |
Hernando, Marcelo Pablo |
title |
Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
title_short |
Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
title_full |
Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
title_fullStr |
Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
title_full_unstemmed |
Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica |
title_sort |
effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal antarctica |
publisher |
Elsevier Science |
url |
http://hdl.handle.net/11336/127140 |
long_lat |
ENVELOPE(-63.717,-63.717,-64.283,-64.283) ENVELOPE(-60.583,-60.583,-62.933,-62.933) |
geographic |
Antarctic Potter Cove Argentina Pablo Varela |
geographic_facet |
Antarctic Potter Cove Argentina Pablo Varela |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/url/https://linkinghub.elsevier.com/retrieve/pii/S0022098119303521 info:eu-repo/semantics/altIdentifier/doi/10.1016/j.jembe.2020.151400 http://hdl.handle.net/11336/127140 Hernando, Marcelo Pablo; Varela, Diana E.; Malanga, Gabriela; Almandoz, Gaston Osvaldo; Schloss, Irene Ruth; Effects of climate-induced changes in temperature and salinity on phytoplankton physiology and stress responses in coastal Antarctica; Elsevier Science; Journal of Experimental Marine Biology and Ecology; 530-531; 9-2020; 151400- 0022-0981 CONICET Digital CONICET |
op_rights |
info:eu-repo/semantics/restrictedAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
op_doi |
https://doi.org/10.1016/j.jembe.2020.151400 |
container_title |
Journal of Experimental Marine Biology and Ecology |
container_volume |
530-531 |
container_start_page |
151400 |
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1779309952861470720 |