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Modeling the influence of time and temperature on the levels of fatty acids in the liver of Antarctic fish Trematomus bernacchii
- Source :
- Polar Biology
- Publication Year :
- 2019
- Publisher :
- Springer Science and Business Media LLC, 2019.
-
Abstract
- Antarctic fish (Trematomus bernacchii) are an ideal group for studying the effect of ocean warming on vital physiological and biochemical mechanisms of adaptation, including changes in the fatty acid composition to higher heat tolerance in the sub-zero waters of the Southern Ocean. Despite the awareness of the impact of ocean warming on marine life, bioclimatic models describing the effect of temperature and time on fatty acid levels in marine species have not been considered yet. The objective of the present study was to investigate changes in the concentrations of fatty acids in liver fromT. bernacchiiin response to an increase in temperature in the Antarctic region. Changes in the concentrations of fatty acids in liver fromT. bernacchiiwere observed after varying simultaneously and systematically the temperature and time. The fatty acid profiles were determined by gas chromatography prior to acclimation (− 1.8 °C) and after acclimation (0.0, 1.0, and 2.0 °C) at different times (1, 5, and 10 days). The observed changes were graphically visualized by expressing the fatty acid concentration in absolute units (mg g−1) as a function of the temperature and time using polynomial models. Major changes in fatty acid composition were observed at day 1 of exposition at all temperatures. At day 5, the fish seem to tolerate the new temperature condition. The concentrations of saturated fatty acids were almost constant throughout the various conditions. The concentrations of monounsaturated fatty acids (in particular 18:1n− 9) decrease at day 1 for all temperatures. In contrast, there was an increase in the concentrations of polyunsaturated fatty acids (in particular 20:5n− 3 and 22:6n− 3) with increasing temperatures after 1, 5, and 10 days of exposure. The proposed models were in agreement with reported studies on polar and temperate fish, indicating possibly similar adaptation mechanisms for teleost to cope with global warming.
- Subjects :
- chemistry.chemical_classification
0303 health sciences
Effects of global warming on oceans
Fatty acid
010501 environmental sciences
Biology
biology.organism_classification
01 natural sciences
Acclimatization
03 medical and health sciences
chemistry
Trematomus
Temperate climate
Fish
Food science
Fatty acid composition
General Agricultural and Biological Sciences
030304 developmental biology
0105 earth and related environmental sciences
Polyunsaturated fatty acid
Subjects
Details
- ISSN :
- 14322056 and 07224060
- Volume :
- 42
- Database :
- OpenAIRE
- Journal :
- Polar Biology
- Accession number :
- edsair.doi.dedup.....0c9ca6e25ce0eb68347144afb5ad868d