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Effect of combined stress (salinity and temperature) in European sea bass Dicentrarchus labrax osmoregulatory processes.

Abstract

European sea bass Dicentrarchus labrax undertake seasonal migrations to estuaries and lagoons that are characterized by fluctuations in environmental conditions. Their ability to cope with these unstable habitats is undeniable, but it is still not clear how and to what extent salinity acclimation mechanisms are affected at temperatures higher than in the sea. In this study, juvenile sea bass were pre-acclimated to seawater (SW) at 18°C (temperate) or 24°C (warm) for 2weeks and then transferred to fresh water (FW) or SW at the respective temperature. Transfer to FW for two weeks resulted in decreased blood osmolalities and plasma Cl- at both temperatures. In FW warm conditions, plasma Na+ was ~15% lower and Cl- was ~32% higher than in the temperate-water group. Branchial Na+/K+-ATPase (NKA) activity measured at the acclimation temperature (Vapparent) did not change according to the conditions. Branchial Na+/K+-ATPase activity measured at 37°C (Vmax) was lower in warm conditions and increased in FW compared to SW conditions whatever the considered temperature. Mitochondrion-rich cell (MRC) density increased in FW, notably due to the appearance of lamellar MRCs, but this increase was less pronounced in warm conditions where MRC's size was lower. In SW warm conditions, pavement cell apical microridges are less developed than in other conditions. Overall gill morphometrical parameters (filament thickness, lamellar length and width) differ between fish that have been pre-acclimated to different temperatures. This study shows that a thermal change affects gill plasticity affecting whole-organism ion balance two weeks after salinity transfer.

Authors+Show Affiliations

Université Montpellier, UMR 9190 MARBEC, UM-CNRS-IRD-IFREFMER, cc 092, Place E. Bataillon, 34095 Montpellier Cedex 05, France.Université Montpellier, UMR 9190 MARBEC, UM-CNRS-IRD-IFREFMER, cc 092, Place E. Bataillon, 34095 Montpellier Cedex 05, France.Université Montpellier, UMR 9190 MARBEC, UM-CNRS-IRD-IFREFMER, cc 092, Place E. Bataillon, 34095 Montpellier Cedex 05, France.Université Montpellier, UMR 9190 MARBEC, UM-CNRS-IRD-IFREFMER, cc 092, Place E. Bataillon, 34095 Montpellier Cedex 05, France. Electronic address: catherine.lorin@umontpellier.fr.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29056479

Citation

Masroor, Waliullah, et al. "Effect of Combined Stress (salinity and Temperature) in European Sea Bass Dicentrarchus Labrax Osmoregulatory Processes." Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, vol. 215, 2018, pp. 45-54.
Masroor W, Farcy E, Gros R, et al. Effect of combined stress (salinity and temperature) in European sea bass Dicentrarchus labrax osmoregulatory processes. Comp Biochem Physiol, Part A Mol Integr Physiol. 2018;215:45-54.
Masroor, W., Farcy, E., Gros, R., & Lorin-Nebel, C. (2018). Effect of combined stress (salinity and temperature) in European sea bass Dicentrarchus labrax osmoregulatory processes. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 215, pp. 45-54. doi:10.1016/j.cbpa.2017.10.019.
Masroor W, et al. Effect of Combined Stress (salinity and Temperature) in European Sea Bass Dicentrarchus Labrax Osmoregulatory Processes. Comp Biochem Physiol, Part A Mol Integr Physiol. 2018;215:45-54. PubMed PMID: 29056479.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of combined stress (salinity and temperature) in European sea bass Dicentrarchus labrax osmoregulatory processes. AU - Masroor,Waliullah, AU - Farcy,Emilie, AU - Gros,Romain, AU - Lorin-Nebel,Catherine, Y1 - 2017/10/19/ PY - 2017/07/19/received PY - 2017/10/17/revised PY - 2017/10/17/accepted PY - 2017/10/24/pubmed PY - 2018/5/2/medline PY - 2017/10/24/entrez KW - Gill plasticity KW - Hydromineral balance KW - Ionocytes KW - NKA activity KW - Osmoregulation KW - Teleost KW - Thermal acclimation SP - 45 EP - 54 JF - Comparative biochemistry and physiology. Part A, Molecular & integrative physiology JO - Comp. Biochem. Physiol., Part A Mol. Integr. Physiol. VL - 215 N2 - European sea bass Dicentrarchus labrax undertake seasonal migrations to estuaries and lagoons that are characterized by fluctuations in environmental conditions. Their ability to cope with these unstable habitats is undeniable, but it is still not clear how and to what extent salinity acclimation mechanisms are affected at temperatures higher than in the sea. In this study, juvenile sea bass were pre-acclimated to seawater (SW) at 18°C (temperate) or 24°C (warm) for 2weeks and then transferred to fresh water (FW) or SW at the respective temperature. Transfer to FW for two weeks resulted in decreased blood osmolalities and plasma Cl- at both temperatures. In FW warm conditions, plasma Na+ was ~15% lower and Cl- was ~32% higher than in the temperate-water group. Branchial Na+/K+-ATPase (NKA) activity measured at the acclimation temperature (Vapparent) did not change according to the conditions. Branchial Na+/K+-ATPase activity measured at 37°C (Vmax) was lower in warm conditions and increased in FW compared to SW conditions whatever the considered temperature. Mitochondrion-rich cell (MRC) density increased in FW, notably due to the appearance of lamellar MRCs, but this increase was less pronounced in warm conditions where MRC's size was lower. In SW warm conditions, pavement cell apical microridges are less developed than in other conditions. Overall gill morphometrical parameters (filament thickness, lamellar length and width) differ between fish that have been pre-acclimated to different temperatures. This study shows that a thermal change affects gill plasticity affecting whole-organism ion balance two weeks after salinity transfer. SN - 1531-4332 UR - https://www.unboundmedicine.com/medline/citation/29056479/Effect_of_combined_stress__salinity_and_temperature__in_European_sea_bass_Dicentrarchus_labrax_osmoregulatory_processes_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S1095-6433(17)30233-7 DB - PRIME DP - Unbound Medicine ER -