期刊
MARINE ENVIRONMENTAL RESEARCH
卷 150, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.marenvres.2019.104779
关键词
Notothenia; Metabolism; Temperature; Admiralty Bay; Biomarker; Effects-fish
资金
- Brazilian Ministry of Environment (MMA)
- Ministry of Science, Technology and Innovation (MCTI)
- National Council for the Development of Scientific and Technological Research (CNPq)
- Brazilian Federal Agency for Support and Evaluation of Graduate Education (CAPES)
- Secretariat of the Commission for the Resources of the Sea (SeCIRM)
- CAPES
- CNPq
- FAPERJ [2443/2011, 305969/2012-9, 304208/2016-6, 574018/2008-5, E-26/170.023/2008]
The warming of the Southern Ocean waters may affect the biological processes and the performance of the fish inhabiting it. The notothenioid group is metabolically specialized to low-temperature environments and may be vulnerable to the climatic changes imposed on the Antarctic continent. However, gradual temperature changes potentially allow an opportunity for plasticity adjustments. The present study evaluated the effect of gradual increase of temperature on the enzymatic and nonenzymatic parameters of energy metabolism in renal, branchial, hepatic, and encephalic tissue of Notothenia rossii subjected to a gradual temperature change of 0.5 degrees C/day until reaching 2 degrees C, 4 degrees C, 6 degrees C, and 8 degrees C. Under the effect of an acclimation rate of 0.5 degrees C/day, the gill tissue showed increased phosphofructokinase (PFK) enzyme activity. In the kidney, there was increased activity of the malate dehydrogenase (MDH), glucose-6-phosphatase (G6PDH), and glycogen phosphorylase (GP) enzymes. There was an increase in lactate concentration in the liver and an increase in GP enzyme activity in the brain. The specific tissue responses indicate the presence of thermal plasticity and an attempt to regulate energy metabolism to mitigate thermal stress in this species under these experimental conditions, possibly through the activation of glycolysis, gluconeogenesis, and glycogenolysis.
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