Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids?
Heat waves are threatening fish around the world, leading sometimes to mass mortality events. One crucial function of fish failing in high temperatures is oxygen delivery capacity, i.e. cardiovascular function. For anadromous salmonids, increased temperature could be especially detrimental during up...
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Oxford University Press
2022
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ftunivturku:oai:www.utupub.fi:10024/157527 2023-05-15T15:00:00+02:00 Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? Torstein Kristensen Katja Anttila Giovanna Mottola fysiologia ja genetiikka, Physiology and Genetics biologian laitoksen yhteiset, Department of Biology 2606404 2606400 2022-10-27T12:16:59Z https://www.utupub.fi/handle/10024/157527 en eng Oxford University Press Britannia United Kingdom GB 8 coaa101 10.1093/conphys/coaa101 Conservation Physiology 1 https://www.utupub.fi/handle/10024/157527 URN:NBN:fi-fe2021042822947 2051-1434 2022 ftunivturku 2022-11-02T23:59:22Z Heat waves are threatening fish around the world, leading sometimes to mass mortality events. One crucial function of fish failing in high temperatures is oxygen delivery capacity, i.e. cardiovascular function. For anadromous salmonids, increased temperature could be especially detrimental during upstream migration since they need efficiently working oxygen delivery system in order to cross the river rapids to reach upstream areas. The migration also occurs during summer and early autumn exposing salmonids to peak water temperatures, and in shallow rivers there is little availability for thermal refuges as compared to thermally stratified coastal and lake habitats. In order to shed light on the mechanisms underpinning the capacity of migrating fish to face high environmental temperatures, we applied a physiological and molecular approach measuring cardiovascular capacities of migrating and resident Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in Northern Norway. The maximum cardiovascular capacity of migrating fish was significantly lower compared to the resident conspecifics. The onset of cardiac impairment started only 2°C higher than river temperature, meaning that even a small increase in water temperature may already compromise cardiac function. The migrating fish were also under significant cellular stress, expressing increased level of cardiac heat shock proteins. We consider these findings highly valuable when addressing climate change effect on migrating fish and encourage taking action in riverine habitat conservation policies. The significant differences in upper thermal tolerance of resident and migrating fish could also lead changes in population dynamics, which should be taken into account in future conservation plans. Other/Unknown Material Arctic Climate change Northern Norway Salvelinus alpinus University of Turku: UTUPub Arctic Norway |
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University of Turku: UTUPub |
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language |
English |
description |
Heat waves are threatening fish around the world, leading sometimes to mass mortality events. One crucial function of fish failing in high temperatures is oxygen delivery capacity, i.e. cardiovascular function. For anadromous salmonids, increased temperature could be especially detrimental during upstream migration since they need efficiently working oxygen delivery system in order to cross the river rapids to reach upstream areas. The migration also occurs during summer and early autumn exposing salmonids to peak water temperatures, and in shallow rivers there is little availability for thermal refuges as compared to thermally stratified coastal and lake habitats. In order to shed light on the mechanisms underpinning the capacity of migrating fish to face high environmental temperatures, we applied a physiological and molecular approach measuring cardiovascular capacities of migrating and resident Arctic char (Salvelinus alpinus) and brown trout (Salmo trutta) in Northern Norway. The maximum cardiovascular capacity of migrating fish was significantly lower compared to the resident conspecifics. The onset of cardiac impairment started only 2°C higher than river temperature, meaning that even a small increase in water temperature may already compromise cardiac function. The migrating fish were also under significant cellular stress, expressing increased level of cardiac heat shock proteins. We consider these findings highly valuable when addressing climate change effect on migrating fish and encourage taking action in riverine habitat conservation policies. The significant differences in upper thermal tolerance of resident and migrating fish could also lead changes in population dynamics, which should be taken into account in future conservation plans. |
author2 |
fysiologia ja genetiikka, Physiology and Genetics biologian laitoksen yhteiset, Department of Biology 2606404 2606400 |
author |
Torstein Kristensen Katja Anttila Giovanna Mottola |
spellingShingle |
Torstein Kristensen Katja Anttila Giovanna Mottola Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
author_facet |
Torstein Kristensen Katja Anttila Giovanna Mottola |
author_sort |
Torstein Kristensen |
title |
Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
title_short |
Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
title_full |
Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
title_fullStr |
Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
title_full_unstemmed |
Compromised thermal tolerance of cardiovascular capacity in upstream migrating Arctic char and brown trout - are hot summers threatening migrating salmonids? |
title_sort |
compromised thermal tolerance of cardiovascular capacity in upstream migrating arctic char and brown trout - are hot summers threatening migrating salmonids? |
publisher |
Oxford University Press |
publishDate |
2022 |
url |
https://www.utupub.fi/handle/10024/157527 |
geographic |
Arctic Norway |
geographic_facet |
Arctic Norway |
genre |
Arctic Climate change Northern Norway Salvelinus alpinus |
genre_facet |
Arctic Climate change Northern Norway Salvelinus alpinus |
op_relation |
8 coaa101 10.1093/conphys/coaa101 Conservation Physiology 1 https://www.utupub.fi/handle/10024/157527 URN:NBN:fi-fe2021042822947 2051-1434 |
_version_ |
1766332107107336192 |