Phospholipid fatty acids are correlated with critical thermal tolerance but not with critical pressure tolerance in the shallow-water shrimp Palaemon varians during sustained exposure to low temperature
Phospholipid fatty acids are correlated with critical thermal tolerance but not with critical pressure tolerance in the shallow-water shrimp Palaemon varians during sustained exposure to low temperature
Some extant deep-sea shrimp are known to be descended from shallow-water ancestors that adapted to environmental conditions (constant low temperature and high hydrostatic pressure) in the deep sea. During acclimation to low temperature and high hydrostatic pressure representative of the deep-sea, critical thermal tolerance decreases and critical pressure tolerance increases in the shallow-water shrimp Palaemon varians. It has been suggested that these shifts may depend in part on adjustments to phospholipid fatty acid composition and/or metabolic adjustments. Here, we present evidence that metabolic rate does not change during sustained exposure to low temperature (5°C) in the shallow-water shrimp Palaemon varians, and that metabolic rate and acute environmental tolerances are not correlated during sustained exposure to low temperature, suggesting that standard metabolic rate does not affect acute environmental tolerances. In contrast, we present evidence that phospholipid fatty acid composition does shift during sustained exposure to low temperature. Desaturation of fatty acids during sustained exposure to low temperature supports the suggestion that cell lipid bilayer homeoviscous modifications are important in low temperature acclimation. Shifts in several individual phospholipid fatty acids during sustained low temperature exposure are correlated with critical thermal tolerance. Exploring the greater complexity apparent in the responses of these phospholipid fatty acids to sustained low temperature exposures suggests a potential homeostatic impact moderating adverse impacts on nervous system function. However, shifts in phospholipid fatty acids are not correlated with critical pressure tolerance during exposure to low temperature, suggesting that shifts in critical pressure tolerance are related to modifications other than cell lipid bilayer composition.
Adaptation, Caridea, Deep sea, Ecology, Physiology, Shallow water
Brown, Alastair E
e8ff3585-dd26-47bc-bdcb-55eeda5001d2
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Pond, David
1997312b-b198-4a52-89e0-e7bfc5aa9250
Oliphant, Andrew
a080aa80-9deb-4e70-aadb-7c0b02600735
1 August 2020
Brown, Alastair E
e8ff3585-dd26-47bc-bdcb-55eeda5001d2
Thatje, Sven
f1011fe3-1048-40c0-97c1-e93b796e6533
Pond, David
1997312b-b198-4a52-89e0-e7bfc5aa9250
Oliphant, Andrew
a080aa80-9deb-4e70-aadb-7c0b02600735
Brown, Alastair E, Thatje, Sven, Pond, David and Oliphant, Andrew
(2020)
Phospholipid fatty acids are correlated with critical thermal tolerance but not with critical pressure tolerance in the shallow-water shrimp Palaemon varians during sustained exposure to low temperature.
Journal of Experimental Marine Biology and Ecology, 529, [151394].
(doi:10.1016/j.jembe.2020.151394).
Abstract
Some extant deep-sea shrimp are known to be descended from shallow-water ancestors that adapted to environmental conditions (constant low temperature and high hydrostatic pressure) in the deep sea. During acclimation to low temperature and high hydrostatic pressure representative of the deep-sea, critical thermal tolerance decreases and critical pressure tolerance increases in the shallow-water shrimp Palaemon varians. It has been suggested that these shifts may depend in part on adjustments to phospholipid fatty acid composition and/or metabolic adjustments. Here, we present evidence that metabolic rate does not change during sustained exposure to low temperature (5°C) in the shallow-water shrimp Palaemon varians, and that metabolic rate and acute environmental tolerances are not correlated during sustained exposure to low temperature, suggesting that standard metabolic rate does not affect acute environmental tolerances. In contrast, we present evidence that phospholipid fatty acid composition does shift during sustained exposure to low temperature. Desaturation of fatty acids during sustained exposure to low temperature supports the suggestion that cell lipid bilayer homeoviscous modifications are important in low temperature acclimation. Shifts in several individual phospholipid fatty acids during sustained low temperature exposure are correlated with critical thermal tolerance. Exploring the greater complexity apparent in the responses of these phospholipid fatty acids to sustained low temperature exposures suggests a potential homeostatic impact moderating adverse impacts on nervous system function. However, shifts in phospholipid fatty acids are not correlated with critical pressure tolerance during exposure to low temperature, suggesting that shifts in critical pressure tolerance are related to modifications other than cell lipid bilayer composition.
Text
Brown_al._J_Exp_Mar_Biol_Ecol_revised2_clean_deposited
- Accepted Manuscript
More information
Accepted/In Press date: 29 April 2020
Published date: 1 August 2020
Keywords:
Adaptation, Caridea, Deep sea, Ecology, Physiology, Shallow water
Identifiers
Local EPrints ID: 440663
URI: http://eprints.soton.ac.uk/id/eprint/440663
ISSN: 0022-0981
PURE UUID: e86dd614-56b6-435e-8fa6-2600f45416b0
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Date deposited: 13 May 2020 16:33
Last modified: 17 Mar 2024 05:32
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Contributors
Author:
Alastair E Brown
Author:
Sven Thatje
Author:
David Pond
Author:
Andrew Oliphant
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