Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities.
Antarctic krill (Euphausia superba) from South Georgia comprise one of the most northern and abundant krill stocks. South Georgia waters are undergoing rapid warming, as a result of climate change, which in turn could alter the oxygen concentration of the water. We investigated gene expression in An...
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ftdatacite:10.1594/pangaea.834807 2023-05-15T13:59:27+02:00 Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. Tremblay, Nelly Cascella, Kévin Toullec, Jean-Yves Held, Christoph Fielding, Sophie Tarling, Geraint A Abele, Doris 2014 application/zip https://dx.doi.org/10.1594/pangaea.834807 https://doi.pangaea.de/10.1594/PANGAEA.834807 en eng PANGAEA - Data Publisher for Earth & Environmental Science Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 CC-BY Rectangular midwater trawl 4500 µm article Supplementary Collection of Datasets Collection 2014 ftdatacite https://doi.org/10.1594/pangaea.834807 2022-02-09T13:31:34Z Antarctic krill (Euphausia superba) from South Georgia comprise one of the most northern and abundant krill stocks. South Georgia waters are undergoing rapid warming, as a result of climate change, which in turn could alter the oxygen concentration of the water. We investigated gene expression in Antarctic krill related to aerobic metabolism, antioxidant defence, and heat-shock response under severe (2.5% O2 saturation or 0.6 kPa) and threshold (20% O2 saturation or 4 kPa) hypoxia exposure compared to in situ levels (normoxic; 100% O2 saturation or 21 kPa). Biochemical metabolic and oxidative stress indicators complemented the genic expression analysis to detect in vivo signs of stress during the hypoxia treatments. Expression levels of the genes citrate synthase (CS), mitochondrial manganese superoxide dismutase (SODMn-m) and one heat-shock protein isoform (E) were higher in euphausiids incubated 6 h at 20% O2 saturation than in animals exposed to control (normoxic) conditions. All biochemical antioxidant defence parameters remained unchanged among treatments. Levels of lipid peroxidation were raised after 6 h of severe hypoxia. Overall, short-term exposure to hypoxia altered mitochondrial metabolic and antioxidant capacity, but did not induce anaerobic metabolism. Antarctic krill are swarming organisms and may experience short periods of hypoxia when present in dense swarms. A future, warmer Southern ocean, where oxygen saturation levels are decreased, may result in smaller, less dense swarms as they act to avoid greater levels of hypoxia. Article in Journal/Newspaper Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean DataCite Metadata Store (German National Library of Science and Technology) Antarctic Southern Ocean The Antarctic Tremblay ENVELOPE(-120.853,-120.853,55.783,55.783) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
Rectangular midwater trawl 4500 µm |
spellingShingle |
Rectangular midwater trawl 4500 µm Tremblay, Nelly Cascella, Kévin Toullec, Jean-Yves Held, Christoph Fielding, Sophie Tarling, Geraint A Abele, Doris Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
topic_facet |
Rectangular midwater trawl 4500 µm |
description |
Antarctic krill (Euphausia superba) from South Georgia comprise one of the most northern and abundant krill stocks. South Georgia waters are undergoing rapid warming, as a result of climate change, which in turn could alter the oxygen concentration of the water. We investigated gene expression in Antarctic krill related to aerobic metabolism, antioxidant defence, and heat-shock response under severe (2.5% O2 saturation or 0.6 kPa) and threshold (20% O2 saturation or 4 kPa) hypoxia exposure compared to in situ levels (normoxic; 100% O2 saturation or 21 kPa). Biochemical metabolic and oxidative stress indicators complemented the genic expression analysis to detect in vivo signs of stress during the hypoxia treatments. Expression levels of the genes citrate synthase (CS), mitochondrial manganese superoxide dismutase (SODMn-m) and one heat-shock protein isoform (E) were higher in euphausiids incubated 6 h at 20% O2 saturation than in animals exposed to control (normoxic) conditions. All biochemical antioxidant defence parameters remained unchanged among treatments. Levels of lipid peroxidation were raised after 6 h of severe hypoxia. Overall, short-term exposure to hypoxia altered mitochondrial metabolic and antioxidant capacity, but did not induce anaerobic metabolism. Antarctic krill are swarming organisms and may experience short periods of hypoxia when present in dense swarms. A future, warmer Southern ocean, where oxygen saturation levels are decreased, may result in smaller, less dense swarms as they act to avoid greater levels of hypoxia. |
format |
Article in Journal/Newspaper |
author |
Tremblay, Nelly Cascella, Kévin Toullec, Jean-Yves Held, Christoph Fielding, Sophie Tarling, Geraint A Abele, Doris |
author_facet |
Tremblay, Nelly Cascella, Kévin Toullec, Jean-Yves Held, Christoph Fielding, Sophie Tarling, Geraint A Abele, Doris |
author_sort |
Tremblay, Nelly |
title |
Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
title_short |
Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
title_full |
Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
title_fullStr |
Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
title_full_unstemmed |
Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities, supplement to: Tremblay, Nelly; Cascella, Kévin; Toullec, Jean-Yves; Held, Christoph; Fielding, Sophie; Tarling, Geraint A; Abele, Doris (submitted): Gene expression and physiological changes of the Antarctic krill Euphausia superba under different hypoxia intensities. |
title_sort |
gene expression and physiological changes of the antarctic krill euphausia superba under different hypoxia intensities, supplement to: tremblay, nelly; cascella, kévin; toullec, jean-yves; held, christoph; fielding, sophie; tarling, geraint a; abele, doris (submitted): gene expression and physiological changes of the antarctic krill euphausia superba under different hypoxia intensities. |
publisher |
PANGAEA - Data Publisher for Earth & Environmental Science |
publishDate |
2014 |
url |
https://dx.doi.org/10.1594/pangaea.834807 https://doi.pangaea.de/10.1594/PANGAEA.834807 |
long_lat |
ENVELOPE(-120.853,-120.853,55.783,55.783) |
geographic |
Antarctic Southern Ocean The Antarctic Tremblay |
geographic_facet |
Antarctic Southern Ocean The Antarctic Tremblay |
genre |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Krill Euphausia superba Southern Ocean |
op_rights |
Creative Commons Attribution 3.0 Unported https://creativecommons.org/licenses/by/3.0/legalcode cc-by-3.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/pangaea.834807 |
_version_ |
1766268006721126400 |