Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters
The amphipod Gammarus oceanicus can survive being frozen into solid sea ice at a temperature of –6 to 7C- The animals appear to be supercooled at this temperature. No thermal hysteresis agents were present the haemolymph, and the prevention of internal freezing in the animals thus requires a body su...
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Norwegian Polar Institute
1988
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ftjpolarres:oai:journals.openacademia.net:article/2416 2023-05-15T18:02:40+02:00 Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters Vollan Aarset, Arne Zachariassen, Karl Erik 1988-01-06 application/pdf https://polarresearch.net/index.php/polar/article/view/2416 https://doi.org/10.3402/polar.v6i1.6844 eng eng Norwegian Polar Institute https://polarresearch.net/index.php/polar/article/view/2416/5666 https://polarresearch.net/index.php/polar/article/view/2416 doi:10.3402/polar.v6i1.6844 Copyright (c) 2018 Polar Research Polar Research; Vol. 6 No. 1 (1988); 35-41 1751-8369 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 1988 ftjpolarres https://doi.org/10.3402/polar.v6i1.6844 2021-11-11T19:12:43Z The amphipod Gammarus oceanicus can survive being frozen into solid sea ice at a temperature of –6 to 7C- The animals appear to be supercooled at this temperature. No thermal hysteresis agents were present the haemolymph, and the prevention of internal freezing in the animals thus requires a body surface with a low Permeability to water and ice. Gammarus oceanicus is a euryhaline species. Below 700 mOsm seawater, it displays a very efficient osmoregulation, whereas it is an osmoconformer at seawater osmolalities above this value. At +5°C the amphipods die whenever their body fluid osmolality exceeds about 1000 mOsm. When the animals are trapped in freezing seawater, the osmolality of the brine may exceed this value considerably. The tolerance of the animals to hyperosmotic stress thus seems to be higher at subzero temperatures than at +5°C. Article in Journal/Newspaper Polar Research Sea ice Spitsbergen Polar Research (E-Journal) Polar Research 6 1 35 41 |
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Open Polar |
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Polar Research (E-Journal) |
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ftjpolarres |
language |
English |
description |
The amphipod Gammarus oceanicus can survive being frozen into solid sea ice at a temperature of –6 to 7C- The animals appear to be supercooled at this temperature. No thermal hysteresis agents were present the haemolymph, and the prevention of internal freezing in the animals thus requires a body surface with a low Permeability to water and ice. Gammarus oceanicus is a euryhaline species. Below 700 mOsm seawater, it displays a very efficient osmoregulation, whereas it is an osmoconformer at seawater osmolalities above this value. At +5°C the amphipods die whenever their body fluid osmolality exceeds about 1000 mOsm. When the animals are trapped in freezing seawater, the osmolality of the brine may exceed this value considerably. The tolerance of the animals to hyperosmotic stress thus seems to be higher at subzero temperatures than at +5°C. |
format |
Article in Journal/Newspaper |
author |
Vollan Aarset, Arne Zachariassen, Karl Erik |
spellingShingle |
Vollan Aarset, Arne Zachariassen, Karl Erik Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
author_facet |
Vollan Aarset, Arne Zachariassen, Karl Erik |
author_sort |
Vollan Aarset, Arne |
title |
Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
title_short |
Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
title_full |
Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
title_fullStr |
Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
title_full_unstemmed |
Low temperature tolerance and osmotic regulation in the amphipod Gammarus oceanicus from Spitsbergen waters |
title_sort |
low temperature tolerance and osmotic regulation in the amphipod gammarus oceanicus from spitsbergen waters |
publisher |
Norwegian Polar Institute |
publishDate |
1988 |
url |
https://polarresearch.net/index.php/polar/article/view/2416 https://doi.org/10.3402/polar.v6i1.6844 |
genre |
Polar Research Sea ice Spitsbergen |
genre_facet |
Polar Research Sea ice Spitsbergen |
op_source |
Polar Research; Vol. 6 No. 1 (1988); 35-41 1751-8369 |
op_relation |
https://polarresearch.net/index.php/polar/article/view/2416/5666 https://polarresearch.net/index.php/polar/article/view/2416 doi:10.3402/polar.v6i1.6844 |
op_rights |
Copyright (c) 2018 Polar Research |
op_doi |
https://doi.org/10.3402/polar.v6i1.6844 |
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Polar Research |
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6 |
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1 |
container_start_page |
35 |
op_container_end_page |
41 |
_version_ |
1766173102375436288 |