Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii).
Climate change is believed to be altering the Earth's climate, and driving ocean systems into conditions which could fundamentally and irreversibly modify ecology systems, in particular ectothermic marine ecosystems are at great risk. By understanding the relationship between temperature and ra...
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University of Canterbury
2017
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Online Access: | http://hdl.handle.net/10092/13780 https://doi.org/10.26021/5720 |
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ftunivcanter:oai:ir.canterbury.ac.nz:10092/13780 2023-05-15T13:55:49+02:00 Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). Burn, Courtney Jayne 2017 application/pdf http://hdl.handle.net/10092/13780 https://doi.org/10.26021/5720 English en eng University of Canterbury http://hdl.handle.net/10092/13780 http://dx.doi.org/10.26021/5720 All Rights Reserved https://canterbury.libguides.com/rights/theses Theses / Dissertations 2017 ftunivcanter https://doi.org/10.26021/5720 2022-09-08T13:27:55Z Climate change is believed to be altering the Earth's climate, and driving ocean systems into conditions which could fundamentally and irreversibly modify ecology systems, in particular ectothermic marine ecosystems are at great risk. By understanding the relationship between temperature and rates we gain insight into species thermoregulatory behaviour. This project was aimed at investigating what effects chronic and acute temperature changes will have on three species of fish species, blue cod an endemic New Zealand species, black cod a Sub-Antarctic species, and emerald cod an Antarctic species. Fish were exposed to chronic temperature changes for a period of four weeks to gain insight into their ability to acclimate to new temperatures. Blue cod were chronically exposed to 8°C, 12°C, 18°C, black cod were chronically exposed to 8°C, 12°C and emerald cod were exposed to 2°C. Ventilation rate, heart rate and oxygen consumption were measured during acute temperature changes to determine tolerance ranges and the limiting factors to thermal tolerance. Each species was exposed to a different range of acute temperatures depending on chronic exposure temperature. The results showed that blue cod proved to be the most thermally flexible species, showing partial to complete acclimation, with large shifts in tolerance range between acclimations. Black cod and emerald cod showed a shift in tolerance ranges but did not show strong acclimation. In conclusion ventilation rate and heart rate proved to be limiting factors to thermal tolerance. At higher acute exposure temperatures fish were pushed past their tolerance ranges and oxygen consumption reached levels so high that even if ventilatory and circulatory systems did not fail, it would only be a matter of time before mortality occurred. Further studies are needed to understand the mechanisms behind limitation of thermal tolerance to gain an in-depth understanding of how climate change will impact marine ecosystems. Other/Unknown Material Antarc* Antarctic University of Canterbury, Christchurch: UC Research Repository Antarctic New Zealand |
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Open Polar |
collection |
University of Canterbury, Christchurch: UC Research Repository |
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ftunivcanter |
language |
English |
description |
Climate change is believed to be altering the Earth's climate, and driving ocean systems into conditions which could fundamentally and irreversibly modify ecology systems, in particular ectothermic marine ecosystems are at great risk. By understanding the relationship between temperature and rates we gain insight into species thermoregulatory behaviour. This project was aimed at investigating what effects chronic and acute temperature changes will have on three species of fish species, blue cod an endemic New Zealand species, black cod a Sub-Antarctic species, and emerald cod an Antarctic species. Fish were exposed to chronic temperature changes for a period of four weeks to gain insight into their ability to acclimate to new temperatures. Blue cod were chronically exposed to 8°C, 12°C, 18°C, black cod were chronically exposed to 8°C, 12°C and emerald cod were exposed to 2°C. Ventilation rate, heart rate and oxygen consumption were measured during acute temperature changes to determine tolerance ranges and the limiting factors to thermal tolerance. Each species was exposed to a different range of acute temperatures depending on chronic exposure temperature. The results showed that blue cod proved to be the most thermally flexible species, showing partial to complete acclimation, with large shifts in tolerance range between acclimations. Black cod and emerald cod showed a shift in tolerance ranges but did not show strong acclimation. In conclusion ventilation rate and heart rate proved to be limiting factors to thermal tolerance. At higher acute exposure temperatures fish were pushed past their tolerance ranges and oxygen consumption reached levels so high that even if ventilatory and circulatory systems did not fail, it would only be a matter of time before mortality occurred. Further studies are needed to understand the mechanisms behind limitation of thermal tolerance to gain an in-depth understanding of how climate change will impact marine ecosystems. |
format |
Other/Unknown Material |
author |
Burn, Courtney Jayne |
spellingShingle |
Burn, Courtney Jayne Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
author_facet |
Burn, Courtney Jayne |
author_sort |
Burn, Courtney Jayne |
title |
Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
title_short |
Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
title_full |
Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
title_fullStr |
Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
title_full_unstemmed |
Cod in hot water : the thermal physiology of blue cod (Parapercis colias), black cod (Paranotothenia angustata) and emerald rock cod (Trematomus bernacchii). |
title_sort |
cod in hot water : the thermal physiology of blue cod (parapercis colias), black cod (paranotothenia angustata) and emerald rock cod (trematomus bernacchii). |
publisher |
University of Canterbury |
publishDate |
2017 |
url |
http://hdl.handle.net/10092/13780 https://doi.org/10.26021/5720 |
geographic |
Antarctic New Zealand |
geographic_facet |
Antarctic New Zealand |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
http://hdl.handle.net/10092/13780 http://dx.doi.org/10.26021/5720 |
op_rights |
All Rights Reserved https://canterbury.libguides.com/rights/theses |
op_doi |
https://doi.org/10.26021/5720 |
_version_ |
1766262664216969216 |