Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia
Oxygen supply to the heart has been hypothesized to limit cardiac performance and whole animal acute thermal tolerance (CTmax) in fish. We tested these hypotheses by continuously measuring venous oxygen tension (Pvo2) and cardiovascular variables in vivo during acute warming in European perch ( Perc...
Main Authors: | , , , , , |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2016
|
Subjects: | |
Online Access: | http://hdl.handle.net/10536/DRO/DU:30105039 https://figshare.com/articles/journal_contribution/Cardiac_oxygen_limitation_during_an_acute_thermal_challenge_in_the_European_perch_Effects_of_chronic_environmental_warming_and_experimental_hyperoxia/20824054 |
id |
ftdeakinunifig:oai:figshare.com:article/20824054 |
---|---|
record_format |
openpolar |
spelling |
ftdeakinunifig:oai:figshare.com:article/20824054 2024-06-23T07:52:58+00:00 Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia A Ekström J Brijs Timothy Clark A Gräns F Jutfelt E Sandblom 2016-08-01T00:00:00Z http://hdl.handle.net/10536/DRO/DU:30105039 https://figshare.com/articles/journal_contribution/Cardiac_oxygen_limitation_during_an_acute_thermal_challenge_in_the_European_perch_Effects_of_chronic_environmental_warming_and_experimental_hyperoxia/20824054 unknown http://hdl.handle.net/10536/DRO/DU:30105039 https://figshare.com/articles/journal_contribution/Cardiac_oxygen_limitation_during_an_acute_thermal_challenge_in_the_European_perch_Effects_of_chronic_environmental_warming_and_experimental_hyperoxia/20824054 All Rights Reserved Science & Technology Life Sciences & Biomedicine Physiology cardiac performance myocardial oxygenation PvO(2) threshold thermal acclimation teleost TROUT ONCORHYNCHUS-MYKISS ACUTE TEMPERATURE INCREASE RAINBOW-TROUT CLIMATE-CHANGE AEROBIC SCOPE SALMON ONCORHYNCHUS GADUS-MORHUA ACCLIMATION CAPACITY CHINOOK SALMON PACIFIC SALMON Pvo2 threshold Acute Disease Adaptation Physiological Animals Ecosystem Global Warming Heart Heart Rate Heat-Shock Response Myocardium Oxygen Perches Thermotolerance 050204 Environmental Impact Assessment 050205 Environmental Management School of Life and Environmental Sciences 4104 Environmental management Text Journal contribution 2016 ftdeakinunifig 2024-06-06T01:30:02Z Oxygen supply to the heart has been hypothesized to limit cardiac performance and whole animal acute thermal tolerance (CTmax) in fish. We tested these hypotheses by continuously measuring venous oxygen tension (Pvo2) and cardiovascular variables in vivo during acute warming in European perch ( Perca fluviatilis) from a reference area during summer (18°C) and a chronically heated area (Biotest enclosure) that receives warm effluent water from a nuclear power plant and is normally 5–10°C above ambient (24°C at the time of experiments). While CTmaxwas 2.2°C higher in Biotest compared with reference perch, the peaks in cardiac output and heart rate prior to CTmaxoccurred at statistically similar Pvo2values (2.3–4.0 kPa), suggesting that cardiac failure occurred at a common critical Pvo2threshold. Environmental hyperoxia (200% air saturation) increased Pvo2across temperatures in reference fish, but heart rate still declined at a similar temperature. CTmaxof reference fish increased slightly (by 0.9°C) in hyperoxia, but remained significantly lower than in Biotest fish despite an improved cardiac output due to an elevated stroke volume. Thus, while cardiac oxygen supply appears critical to elevate stroke volume at high temperatures, oxygen limitation may not explain the bradycardia and arrhythmia that occur prior to CTmax. Acute thermal tolerance and its thermal plasticity can, therefore, only be partially attributed to cardiac failure from myocardial oxygen limitations, and likely involves limiting factors on multiple organizational levels. Article in Journal/Newspaper Gadus morhua DRO - Deakin Research Online Pacific |
institution |
Open Polar |
collection |
DRO - Deakin Research Online |
op_collection_id |
ftdeakinunifig |
language |
unknown |
topic |
Science & Technology Life Sciences & Biomedicine Physiology cardiac performance myocardial oxygenation PvO(2) threshold thermal acclimation teleost TROUT ONCORHYNCHUS-MYKISS ACUTE TEMPERATURE INCREASE RAINBOW-TROUT CLIMATE-CHANGE AEROBIC SCOPE SALMON ONCORHYNCHUS GADUS-MORHUA ACCLIMATION CAPACITY CHINOOK SALMON PACIFIC SALMON Pvo2 threshold Acute Disease Adaptation Physiological Animals Ecosystem Global Warming Heart Heart Rate Heat-Shock Response Myocardium Oxygen Perches Thermotolerance 050204 Environmental Impact Assessment 050205 Environmental Management School of Life and Environmental Sciences 4104 Environmental management |
spellingShingle |
Science & Technology Life Sciences & Biomedicine Physiology cardiac performance myocardial oxygenation PvO(2) threshold thermal acclimation teleost TROUT ONCORHYNCHUS-MYKISS ACUTE TEMPERATURE INCREASE RAINBOW-TROUT CLIMATE-CHANGE AEROBIC SCOPE SALMON ONCORHYNCHUS GADUS-MORHUA ACCLIMATION CAPACITY CHINOOK SALMON PACIFIC SALMON Pvo2 threshold Acute Disease Adaptation Physiological Animals Ecosystem Global Warming Heart Heart Rate Heat-Shock Response Myocardium Oxygen Perches Thermotolerance 050204 Environmental Impact Assessment 050205 Environmental Management School of Life and Environmental Sciences 4104 Environmental management A Ekström J Brijs Timothy Clark A Gräns F Jutfelt E Sandblom Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
topic_facet |
Science & Technology Life Sciences & Biomedicine Physiology cardiac performance myocardial oxygenation PvO(2) threshold thermal acclimation teleost TROUT ONCORHYNCHUS-MYKISS ACUTE TEMPERATURE INCREASE RAINBOW-TROUT CLIMATE-CHANGE AEROBIC SCOPE SALMON ONCORHYNCHUS GADUS-MORHUA ACCLIMATION CAPACITY CHINOOK SALMON PACIFIC SALMON Pvo2 threshold Acute Disease Adaptation Physiological Animals Ecosystem Global Warming Heart Heart Rate Heat-Shock Response Myocardium Oxygen Perches Thermotolerance 050204 Environmental Impact Assessment 050205 Environmental Management School of Life and Environmental Sciences 4104 Environmental management |
description |
Oxygen supply to the heart has been hypothesized to limit cardiac performance and whole animal acute thermal tolerance (CTmax) in fish. We tested these hypotheses by continuously measuring venous oxygen tension (Pvo2) and cardiovascular variables in vivo during acute warming in European perch ( Perca fluviatilis) from a reference area during summer (18°C) and a chronically heated area (Biotest enclosure) that receives warm effluent water from a nuclear power plant and is normally 5–10°C above ambient (24°C at the time of experiments). While CTmaxwas 2.2°C higher in Biotest compared with reference perch, the peaks in cardiac output and heart rate prior to CTmaxoccurred at statistically similar Pvo2values (2.3–4.0 kPa), suggesting that cardiac failure occurred at a common critical Pvo2threshold. Environmental hyperoxia (200% air saturation) increased Pvo2across temperatures in reference fish, but heart rate still declined at a similar temperature. CTmaxof reference fish increased slightly (by 0.9°C) in hyperoxia, but remained significantly lower than in Biotest fish despite an improved cardiac output due to an elevated stroke volume. Thus, while cardiac oxygen supply appears critical to elevate stroke volume at high temperatures, oxygen limitation may not explain the bradycardia and arrhythmia that occur prior to CTmax. Acute thermal tolerance and its thermal plasticity can, therefore, only be partially attributed to cardiac failure from myocardial oxygen limitations, and likely involves limiting factors on multiple organizational levels. |
format |
Article in Journal/Newspaper |
author |
A Ekström J Brijs Timothy Clark A Gräns F Jutfelt E Sandblom |
author_facet |
A Ekström J Brijs Timothy Clark A Gräns F Jutfelt E Sandblom |
author_sort |
A Ekström |
title |
Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
title_short |
Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
title_full |
Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
title_fullStr |
Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
title_full_unstemmed |
Cardiac oxygen limitation during an acute thermal challenge in the European perch: Effects of chronic environmental warming and experimental hyperoxia |
title_sort |
cardiac oxygen limitation during an acute thermal challenge in the european perch: effects of chronic environmental warming and experimental hyperoxia |
publishDate |
2016 |
url |
http://hdl.handle.net/10536/DRO/DU:30105039 https://figshare.com/articles/journal_contribution/Cardiac_oxygen_limitation_during_an_acute_thermal_challenge_in_the_European_perch_Effects_of_chronic_environmental_warming_and_experimental_hyperoxia/20824054 |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Gadus morhua |
genre_facet |
Gadus morhua |
op_relation |
http://hdl.handle.net/10536/DRO/DU:30105039 https://figshare.com/articles/journal_contribution/Cardiac_oxygen_limitation_during_an_acute_thermal_challenge_in_the_European_perch_Effects_of_chronic_environmental_warming_and_experimental_hyperoxia/20824054 |
op_rights |
All Rights Reserved |
_version_ |
1802644427009687552 |