Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods
Antarctic species possess very low metabolic rates and poor capacities to change their physiological state, thus making them extremely vulnerable to changing environmental conditions. Mitochondria are a key element in shaping whole organism energy turnover and functional capacity. In my study, the e...
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Staats- und Universitätsbibliothek Bremen
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ftawi:oai:epic.awi.de:43064 2024-09-15T17:41:55+00:00 Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods Strobel, Anneli 2013 https://epic.awi.de/id/eprint/43064/ http://elib.suub.uni-bremen.de/peid/D00103202.html https://hdl.handle.net/10013/epic.49590 unknown Staats- und Universitätsbibliothek Bremen Strobel, A. orcid:0000-0003-4198-7211 (2013) Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods , PhD thesis, Universität Bremen. hdl:10013/epic.49590 EPIC3Staats- und Universitätsbibliothek Bremen Thesis notRev 2013 ftawi 2024-06-24T04:16:35Z Antarctic species possess very low metabolic rates and poor capacities to change their physiological state, thus making them extremely vulnerable to changing environmental conditions. Mitochondria are a key element in shaping whole organism energy turnover and functional capacity. In my study, the effects of rising temperature and increased seawater PCO2 on the energy metabolism were compared between various nototheniids from sub-Antarctic and cold-temperate and Antarctic waters, and between cephalopods from the Antarctic and temperate latitudes. I determined extra- and intracellular blood carbonate parameters, enzymatic capacities and oxygen consumption at whole animal and mitochondrial level and mitochondrial lipid composition and proton leak as a measure for routine metabolic rate, in order to compare their abilities for metabolic compensation towards climate change. My results showed limited aerobic capacities of high-Antarctic fish mitochondria towards the warmth and higher CO2-levels. The mitochondrial responses of cephalopods to an acute temperature rise suggest that they possess similar mitochondrial flexibilities and capacities towards the warmth as fish. Nevertheless, generally more effective capacities for acid-base regulation and larger energy reserves (lipids) in fish compared to cephalopods will putatively make them win the competition for resources over longer time-scales, when seawater temperatures and PCO2 continue to rise. Thesis Antarc* Antarctic Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Antarctic species possess very low metabolic rates and poor capacities to change their physiological state, thus making them extremely vulnerable to changing environmental conditions. Mitochondria are a key element in shaping whole organism energy turnover and functional capacity. In my study, the effects of rising temperature and increased seawater PCO2 on the energy metabolism were compared between various nototheniids from sub-Antarctic and cold-temperate and Antarctic waters, and between cephalopods from the Antarctic and temperate latitudes. I determined extra- and intracellular blood carbonate parameters, enzymatic capacities and oxygen consumption at whole animal and mitochondrial level and mitochondrial lipid composition and proton leak as a measure for routine metabolic rate, in order to compare their abilities for metabolic compensation towards climate change. My results showed limited aerobic capacities of high-Antarctic fish mitochondria towards the warmth and higher CO2-levels. The mitochondrial responses of cephalopods to an acute temperature rise suggest that they possess similar mitochondrial flexibilities and capacities towards the warmth as fish. Nevertheless, generally more effective capacities for acid-base regulation and larger energy reserves (lipids) in fish compared to cephalopods will putatively make them win the competition for resources over longer time-scales, when seawater temperatures and PCO2 continue to rise. |
format |
Thesis |
author |
Strobel, Anneli |
spellingShingle |
Strobel, Anneli Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
author_facet |
Strobel, Anneli |
author_sort |
Strobel, Anneli |
title |
Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
title_short |
Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
title_full |
Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
title_fullStr |
Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
title_full_unstemmed |
Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods |
title_sort |
physiological response and mitochondrial adaptations to changing abiotic factors in antarctic fish and cephalopods |
publisher |
Staats- und Universitätsbibliothek Bremen |
publishDate |
2013 |
url |
https://epic.awi.de/id/eprint/43064/ http://elib.suub.uni-bremen.de/peid/D00103202.html https://hdl.handle.net/10013/epic.49590 |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
EPIC3Staats- und Universitätsbibliothek Bremen |
op_relation |
Strobel, A. orcid:0000-0003-4198-7211 (2013) Physiological response and mitochondrial adaptations to changing abiotic factors in Antarctic fish and cephalopods , PhD thesis, Universität Bremen. hdl:10013/epic.49590 |
_version_ |
1810488208586178560 |