urn:ieda:metadata:Effects-of-acute-warming-on-cardiovascular-performance-of-Antarctic-fishes
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Interdisciplinary Earth Data Alliance
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Effects of acute warming on cardiovascular performance of Antarctic fishes
2020-12-18
publication
2020-12-18
released
urn:usap-dc:metadata:601410
Axelsson, Michael
author
Crockett, Elizabeth
crockett@ohio.edu
author
Egginton, Stuart
author
Farrell, Anthony
author
Joyce, William
author
O'Brien, Kristin
University of Alaska, Fairbanks, AK, 99775, US
kmobrien@alaska.edu
http://orcid.org/ORCID:0000-0002-3311-0690
ORCID
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U.S. Antarctic Program (USAP) Data Center
publisher
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.
funderName:NSF:GEO:PLR:Antarctic Organisms and Ecosystems
awardNumber:1341602
awardTitle:Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes
funderName:NSF:GEO:PLR:Antarctic Organisms and Ecosystems
awardNumber:1341663
awardTitle:Collaborative Research: The Physiological and Biochemical Underpinnings of Thermal Tolerance in Antarctic Notothenioid Fishes
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Axelsson, Michael
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Fish
living thing
Biology
IEDA data type categories
IEDA integrated catalog keyword vocabulary
2017-10-11
creation
Cryosphere
IEDA topic
IEDA integrated catalog keyword vocabulary
2017-10-11
creation
Antarctica
place
Antarctic Peninsula
place
US Antarctic Program Data Center (USAP-DC)
Data Center
Creative Commons Attribution Only v4.0 Generic [CC BY 4.0]
Creative Commons Attribution Only v4.0 Generic [CC BY 4.0]
eng
Antarctic Peninsula
2014-09-01
2019-08-31
https://www.usap-dc.org/view/dataset/601410
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This metadata record was generated by an xslt transformation from a DataCite metadata record; The transform was created by Damian Ulbricht and Stephen M. Richard. 2017-11-15 these records include new IEDA keywords for geoportal facets Run on 2021-01-05T20:04:12Z
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