Acclimation of cardiovascular function in Notothenia coriiceps
Abstract: The Southern Ocean has experienced stable, cold temperatures for over 10 million years, yet particular regions are currently undergoing rapid warming. To investigate the impacts of warming on cardiovascular oxygen transport, we compared the cardio-respiratory performance in an Antarctic no...
Main Authors: | , , , , , |
---|---|
Format: | Dataset |
Language: | unknown |
Published: |
IEDA: US Antarctic Program Data Center
2020
|
Subjects: | |
Online Access: | http://get.iedadata.org/metadata/iso/601408 |
id |
dataone:http://get.iedadata.org/metadata/iso/601408 |
---|---|
record_format |
openpolar |
spelling |
dataone:http://get.iedadata.org/metadata/iso/601408 2024-06-03T18:46:23+00:00 Acclimation of cardiovascular function in Notothenia coriiceps Axelsson, Michael Crockett, Elizabeth Egginton, Stuart Farrell, Anthony Joyce, William O'Brien, Kristin BEGINDATE: 2014-09-01T00:00:00Z ENDDATE: 2019-08-31T00:00:00Z 2020-12-18T00:00:00Z http://get.iedadata.org/metadata/iso/601408 unknown IEDA: US Antarctic Program Data Center Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) Dataset 2020 dataone:urn:node:IEDA_USAP 2024-06-03T18:17:00Z Abstract: The Southern Ocean has experienced stable, cold temperatures for over 10 million years, yet particular regions are currently undergoing rapid warming. To investigate the impacts of warming on cardiovascular oxygen transport, we compared the cardio-respiratory performance in an Antarctic notothenioid (Notothenia coriiceps) that was maintained at 0 or 5°C for 6.0-9.5 weeks. When compared at the fish's respective acclimation temperature, the oxygen consumption rate and cardiac output were significantly higher in 5°C-acclimated than 0°C-acclimated fish. The 2.7-fold elevation in cardiac output in 5°C-acclimated fish (17.4 vs. 6.5 ml min-1 kg-1) was predominantly due to a doubling of stroke volume, likely in response to increased cardiac preload, as measured by higher central venous pressure (0.15 vs. 0.08 kPa); tachycardia was minor (29.5 vs. 25.2 beats min-1). When fish were acutely warmed, oxygen consumption rate increased by similar amounts in 0°C- and 5°C-acclimated fish at equivalent test temperatures. In both acclimation groups, the increases in oxygen consumption rate during acute heating were supported by increased cardiac output achieved by elevating heart rate, while stroke volume changed relatively little. Cardiac output was similar between both acclimation groups until 12°C when cardiac output became significantly higher in 5°C-acclimated fish, driven largely by their higher stroke volume. Although cardiac arrhythmias developed at a similar temperature (~14.5°C) in both acclimation groups, the hearts of 5°C-acclimated fish continued to pump until significantly higher temperatures (CTmax for cardiac function 17.7 vs. 15.0°C for 0°C-acclimated fish). These results demonstrate that N. coriiceps is capable of increasing routine cardiac output during both acute and chronic warming, although the mechanisms are different (heart rate-dependent versus primarily stroke volume-dependent regulation, respectively). Cardiac performance was enhanced at higher temperatures following 5°C acclimation, suggesting cardiovascular function may not constrain the capacity of N. coriiceps to withstand a warming climate. Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Antarctic Peninsula Southern Ocean |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) Axelsson, Michael Crockett, Elizabeth Egginton, Stuart Farrell, Anthony Joyce, William O'Brien, Kristin Acclimation of cardiovascular function in Notothenia coriiceps |
topic_facet |
Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: The Southern Ocean has experienced stable, cold temperatures for over 10 million years, yet particular regions are currently undergoing rapid warming. To investigate the impacts of warming on cardiovascular oxygen transport, we compared the cardio-respiratory performance in an Antarctic notothenioid (Notothenia coriiceps) that was maintained at 0 or 5°C for 6.0-9.5 weeks. When compared at the fish's respective acclimation temperature, the oxygen consumption rate and cardiac output were significantly higher in 5°C-acclimated than 0°C-acclimated fish. The 2.7-fold elevation in cardiac output in 5°C-acclimated fish (17.4 vs. 6.5 ml min-1 kg-1) was predominantly due to a doubling of stroke volume, likely in response to increased cardiac preload, as measured by higher central venous pressure (0.15 vs. 0.08 kPa); tachycardia was minor (29.5 vs. 25.2 beats min-1). When fish were acutely warmed, oxygen consumption rate increased by similar amounts in 0°C- and 5°C-acclimated fish at equivalent test temperatures. In both acclimation groups, the increases in oxygen consumption rate during acute heating were supported by increased cardiac output achieved by elevating heart rate, while stroke volume changed relatively little. Cardiac output was similar between both acclimation groups until 12°C when cardiac output became significantly higher in 5°C-acclimated fish, driven largely by their higher stroke volume. Although cardiac arrhythmias developed at a similar temperature (~14.5°C) in both acclimation groups, the hearts of 5°C-acclimated fish continued to pump until significantly higher temperatures (CTmax for cardiac function 17.7 vs. 15.0°C for 0°C-acclimated fish). These results demonstrate that N. coriiceps is capable of increasing routine cardiac output during both acute and chronic warming, although the mechanisms are different (heart rate-dependent versus primarily stroke volume-dependent regulation, respectively). Cardiac performance was enhanced at higher temperatures following 5°C acclimation, suggesting cardiovascular function may not constrain the capacity of N. coriiceps to withstand a warming climate. |
format |
Dataset |
author |
Axelsson, Michael Crockett, Elizabeth Egginton, Stuart Farrell, Anthony Joyce, William O'Brien, Kristin |
author_facet |
Axelsson, Michael Crockett, Elizabeth Egginton, Stuart Farrell, Anthony Joyce, William O'Brien, Kristin |
author_sort |
Axelsson, Michael |
title |
Acclimation of cardiovascular function in Notothenia coriiceps |
title_short |
Acclimation of cardiovascular function in Notothenia coriiceps |
title_full |
Acclimation of cardiovascular function in Notothenia coriiceps |
title_fullStr |
Acclimation of cardiovascular function in Notothenia coriiceps |
title_full_unstemmed |
Acclimation of cardiovascular function in Notothenia coriiceps |
title_sort |
acclimation of cardiovascular function in notothenia coriiceps |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2020 |
url |
http://get.iedadata.org/metadata/iso/601408 |
op_coverage |
BEGINDATE: 2014-09-01T00:00:00Z ENDDATE: 2019-08-31T00:00:00Z |
geographic |
Antarctic Antarctic Peninsula Southern Ocean |
geographic_facet |
Antarctic Antarctic Peninsula Southern Ocean |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Southern Ocean |
_version_ |
1800871097364643840 |