Ocean warming and freshening effects on lipid metabolism in coastal Antarctic phytoplankton assemblages dominated by sub-Antarctic species

被引：9

作者：

Antacli, J. C. ^{[1
,2
]}

Hernando, M. P. ^{[3
,5
]}

De Troch, M. ^{[4
]}

Malanga, G. ^{[6
]}

Mendiolar, M. ^{[7
]}

Hernandez, D. R. ^{[7
]}

Varela, D. E. ^{[8
,9
]}

Antoni, J. ^{[10
,11
]}

Sahade, R. J. ^{[1
,2
]}

Schloss, I. R. ^{[12
,13
,14
]}

机构：

[1] Univ Nacl Cordoba, Fac Ciencias Exactas Fis & Nat, Ecol Marina Av Velez Sarsfield 299, RA-5000 Cordoba Capital, Argentina

[2] Consejo Nacl Invest Cient & Tecn CONICET, Inst Diversidad & Ecol Anim IDEA, Cordoba Capital, Argentina

[3] Comis Nacl Energia Atom, Dept Radiobiol, Av Gral Paz 1499, Buenos Aires, DF, Argentina

[4] Univ Ghent, Marine Biol, Krijgslaan 281 S8, B-9000 Ghent, Belgium

[5] REMARCO, Red Invest Estresores Marinos Costeros America La, Trnava, Slovakia

[6] Univ Buenos Aires UBA CONICET Fisicoquim, Inst Bioquim & Med Mol IBIMOL, Fac Farm & Bioquim, Junin 956,C1113AAD, Buenos Aires, DF, Argentina

[7] Inst Nacl Invest & Desarrollo Pesquero INIDEP, Paseo Victoria Ocampo 1,B7602HSA, Mar Del Plata, Argentina

[8] Univ Victoria, Dept Biol, Victoria, BC, Canada

[9] Univ Victoria, Sch Earth & Ocean Sci, Victoria, BC, Canada

[10] Consejo Nacl Invest Cient & Tecn CONICET, Buenos Aires, DF, Argentina

[11] Univ Nacl La Plata, Fac Ciencias Nat & Museo, Paseo del Bosque S-N, RA-1900 La Plata, Argentina

[12] Inst Antartico Argentino, 25 Mayo 1143, Buenos Aires, DF, Argentina

[13] Ctr Austral Invest Cient CADIC, CONICET, Bernardo Houssay 200, Ushuaia, Tierra Del Fueg, Argentina

[14] Univ Nacl Tierra Del Fuego, Ushuaia, Tierra Del Fueg, Argentina

来源：

SCIENCE OF THE TOTAL ENVIRONMENT | 2021年 / 790卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Coastal Antarctica; Fatty acids; Lipid damage; Phytoplankton; Salinity decrease; Temperature increase; FATTY-ACID-COMPOSITION; GEORGE ISLAND ANTARCTICA; OXIDATIVE STRESS; SEA-ICE; CHEMICAL-COMPOSITION; HOMEOVISCOUS ADAPTATION; BIOCHEMICAL-COMPOSITION; ELEVATED-TEMPERATURE; NUTRIENT LIMITATION; MARINE DIATOMS;

D O I：

10.1016/j.scitotenv.2021.147879

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Marine phytoplankton can utilize different strategies to cope with ocean warming and freshening from glacial melting in polar regions, which are disproportionally impacted by global warming. In the present study, we investigated the individual and combined effects of a 4 degrees C increase in seawater temperature (T+) and a 4 psu decrease in salinity (S & minus;) from ambient values on biomass, nutrient use, fatty acid composition and lipid damage biochemistry of natural phytoplankton assemblages from Potter Cove (25 de Mayo/King George Island, Antarctica). Experiments were conducted by exposing the assemblages to four treatments during a 7-day incubation period using microcosm located along shore from January 23 to 31, 2016. The N:P ratio decreased in all treatments from day 4 onwards, but especially under high temperature (T+). Lipid damage was mainly detected under S0T+ and S & minus;T+ conditions, and it decreased when the production of the antioxidant alpha-tocopherol increased. This antioxidant protection resulted in a build-up of phytoplankton biomass, especially at T+. Under the combined effect of both stressors (S & minus;T+), the concentration of omega 3 fatty acids increased, potentially leading to higher-quality FA composition. These results, which were related to the dominance of sub-Antarctic species in phytoplankton assemblages, contribute to the understanding of the potential consequences of ocean warming and increase seawater freshening on the trophic webs of the Southern Ocean. (c) 2021 Elsevier B.V. All rights reserved. <comment>Superscript/Subscript Available</comment

引用

页数：16

共 127 条

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