Effects of acute warming on cardiovascular performance of Antarctic fishes
Abstract: We tested the hypothesis that blackfin icefish (Chaenocephalus aceratus), one of the six species in the family Channichthyidae (the icefishes) that do not express haemoglobin and myoglobin, lack regulatory cardiovascular flexibility during acute warming and activity. The experimental proto...
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IEDA: US Antarctic Program Data Center
2020
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dataone:http://get.iedadata.org/metadata/iso/601410 2024-06-03T18:46:23+00:00 Effects of acute warming on cardiovascular performance of Antarctic fishes 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/601410 unknown IEDA: US Antarctic Program Data Center Fish Biology Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) Dataset 2020 dataone:urn:node:IEDA_USAP 2024-06-03T18:17:00Z Abstract: We tested the hypothesis that blackfin icefish (Chaenocephalus aceratus), one of the six species in the family Channichthyidae (the icefishes) that do not express haemoglobin and myoglobin, lack regulatory cardiovascular flexibility during acute warming and activity. The experimental protocols were designed to optimize the surgical protocol and minimize stress. First, minimally invasive heart rate (fH) measurements were made during a thermal ramp until cardiac failure in C. aceratus and compared with those from the closely related red-blooded black rockcod (Notothenia coriiceps). Then, integrative cardiovascular adjustments were more extensively studied using flow probes and intravascular catheters in C. aceratus during acute warming (from 0 to 8°C) at rest and after imposed activity. Chaenocephalus aceratus had a lower routine fH than N. coriiceps (9 beats min-1 versus 14 beats min-1) and a lower peak fH during acute warming (38 beats min-1 versus 55 beats min-1) with a similar cardiac breakpoint temperature (13 and 14°C, respectively). Routine cardiac output (Q̇) for C. aceratus at ∼0°C was much lower (26.6 ml min-1 kg-1) than previously reported, probably because fish in the present study had a low fH (12 beats min-1) indicative of a high routine vagal tone and low stress. Chaenocephalus aceratus increased oxygen consumption during acute warming and with activity. Correspondingly, Q̇ increased considerably (maximally 86.3 ml min-1 kg-1), as did vascular conductance (5-fold). Thus, unlike earlier suggestions, these data provide convincing evidence that icefish can mount a well-developed cardiovascular regulation of heart rate, cardiac output and vascular conductance, and this regulatory capacity provides flexibility during acute warming. Dataset Antarc* Antarctic Antarctic Peninsula Antarctica Icefish IEDA: US Antarctic Program Data Center (via DataONE) Antarctic Antarctic Peninsula |
institution |
Open Polar |
collection |
IEDA: US Antarctic Program Data Center (via DataONE) |
op_collection_id |
dataone:urn:node:IEDA_USAP |
language |
unknown |
topic |
Fish Biology Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
spellingShingle |
Fish Biology Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) Axelsson, Michael Crockett, Elizabeth Egginton, Stuart Farrell, Anthony Joyce, William O'Brien, Kristin Effects of acute warming on cardiovascular performance of Antarctic fishes |
topic_facet |
Fish Biology Cryosphere Antarctica Antarctic Peninsula US Antarctic Program Data Center (USAP-DC) |
description |
Abstract: We tested the hypothesis that blackfin icefish (Chaenocephalus aceratus), one of the six species in the family Channichthyidae (the icefishes) that do not express haemoglobin and myoglobin, lack regulatory cardiovascular flexibility during acute warming and activity. The experimental protocols were designed to optimize the surgical protocol and minimize stress. First, minimally invasive heart rate (fH) measurements were made during a thermal ramp until cardiac failure in C. aceratus and compared with those from the closely related red-blooded black rockcod (Notothenia coriiceps). Then, integrative cardiovascular adjustments were more extensively studied using flow probes and intravascular catheters in C. aceratus during acute warming (from 0 to 8°C) at rest and after imposed activity. Chaenocephalus aceratus had a lower routine fH than N. coriiceps (9 beats min-1 versus 14 beats min-1) and a lower peak fH during acute warming (38 beats min-1 versus 55 beats min-1) with a similar cardiac breakpoint temperature (13 and 14°C, respectively). Routine cardiac output (Q̇) for C. aceratus at ∼0°C was much lower (26.6 ml min-1 kg-1) than previously reported, probably because fish in the present study had a low fH (12 beats min-1) indicative of a high routine vagal tone and low stress. Chaenocephalus aceratus increased oxygen consumption during acute warming and with activity. Correspondingly, Q̇ increased considerably (maximally 86.3 ml min-1 kg-1), as did vascular conductance (5-fold). Thus, unlike earlier suggestions, these data provide convincing evidence that icefish can mount a well-developed cardiovascular regulation of heart rate, cardiac output and vascular conductance, and this regulatory capacity provides flexibility during acute warming. |
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 |
Effects of acute warming on cardiovascular performance of Antarctic fishes |
title_short |
Effects of acute warming on cardiovascular performance of Antarctic fishes |
title_full |
Effects of acute warming on cardiovascular performance of Antarctic fishes |
title_fullStr |
Effects of acute warming on cardiovascular performance of Antarctic fishes |
title_full_unstemmed |
Effects of acute warming on cardiovascular performance of Antarctic fishes |
title_sort |
effects of acute warming on cardiovascular performance of antarctic fishes |
publisher |
IEDA: US Antarctic Program Data Center |
publishDate |
2020 |
url |
http://get.iedadata.org/metadata/iso/601410 |
op_coverage |
BEGINDATE: 2014-09-01T00:00:00Z ENDDATE: 2019-08-31T00:00:00Z |
geographic |
Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica Icefish |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Icefish |
_version_ |
1800871332368351232 |