Mitochondrial acclimation capacities to ocean warming and acidification are limited in the antarctic Nototheniid Fish, Notothenia rossii and Lepidonotothen squamifrons
| Autor: | Hans O. Poertner, Anneli Strobel, Felix Christopher Mark, Martin Graeve |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
0106 biological sciences
Acclimatization Effects of global warming on oceans lcsh:Medicine Global Warming Biochemistry 01 natural sciences Notothenia rossii chemistry.chemical_compound Global Change Ecology Inner mitochondrial membrane lcsh:Science chemistry.chemical_classification 0303 health sciences Multidisciplinary Ecology Electron Transport Complex II Fatty Acids Temperature Marine Ecology Lipids Mitochondria Mitochondrial Membranes Carbon dioxide Metabolic Pathways Research Article Oceans and Seas Antarctic Regions Zoology Marine Biology Biology 010603 evolutionary biology 03 medical and health sciences Oxygen Consumption Fish physiology Respiration Animals Animal Physiology 14. Life underwater 030304 developmental biology Electron Transport Complex I lcsh:R Fatty acid Carbon Dioxide Lipid Metabolism biology.organism_classification Perciformes Metabolism chemistry 13. Climate action lcsh:Q Acids |
| Zdroj: | PLoS ONE, Vol 8, Iss 7, p e68865 (2013) PLoS ONE EPIC3PLoS ONE, 8(7), pp. e68865, ISSN: 1932-6203 |
| ISSN: | 1932-6203 |
| Popis: | Antarctic notothenioid fish are characterized by their evolutionary adaptation to the cold, thermostable Southern Ocean, which is associated with unique physiological adaptations to withstand the cold and reduce energetic requirements but also entails limited compensation capacities to environmental change. This study compares the capacities of mitochondrial acclimation to ocean warming and acidification between the Antarctic nototheniid Notothenia rossii and the sub-Antarctic Lepidonotothen squamifrons, which share a similar ecology, but different habitat temperatures. After acclimation of L. squamifrons to 9°C and N. rossii to 7°C (normocapnic/hypercapnic, 0.2 kPa CO2/2000 ppm CO2) for 4–6 weeks, we compared the capacities of their mitochondrial respiratory complexes I (CI) and II (CII), their P/O ratios (phosphorylation efficiency), proton leak capacities and mitochondrial membrane fatty acid compositions. Our results reveal reduced CII respiration rates in warm-acclimated L. squamifrons and cold hypercapnia-acclimated N. rossii. Generally, L. squamifrons displayed a greater ability to increase CI contribution during acute warming and after warm-acclimation than N. rossii. Membrane unsaturation was not altered by warm or hypercapnia-acclimation in both species, but membrane fatty acids of warm-acclimated L. squamifrons were less saturated than in warm normocapnia−/hypercapnia-acclimated N. rossii. Proton leak capacities were not affected by warm or hypercapnia-acclimation of N. rossii. We conclude that an acclimatory response of mitochondrial capacities may include higher thermal plasticity of CI supported by enhanced utilization of anaplerotic substrates (via oxidative decarboxylation reactions) feeding into the citrate cycle. L. squamifrons possesses higher relative CI plasticities than N. rossii, which may facilitate the usage of energy efficient NADH-related substrates under conditions of elevated energy demand, possibly induced by ocean warming and acidification. The observed adjustments of electron transport system complexes with a higher flux through CI under warming and acidification suggest a metabolic acclimation potential of the sub-Antarctic L. squamifrons, but only limited acclimation capacities for N. rossii. |
| Databáze: | OpenAIRE |
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