Heart rate and ventilation in Antarctic fishes are largely determined by ecotype

Campbell, H., Davison, W., Fraser, K.P.P., Peck, L.S. and Egginton, S. (2009) Heart rate and ventilation in Antarctic fishes are largely determined by ecotype. Journal of Fish Biology, 74 3: 535-552. doi:10.1111/j.1095-8649.2008.02141.x

Author Campbell, H.
Davison, W.
Fraser, K.P.P.
Peck, L.S.
Egginton, S.
Title Heart rate and ventilation in Antarctic fishes are largely determined by ecotype
Journal name Journal of Fish Biology   Check publisher's open access policy
ISSN 0022-1112
Publication date 2009-02
Sub-type Article (original research)
DOI 10.1111/j.1095-8649.2008.02141.x
Volume 74
Issue 3
Start page 535
End page 552
Total pages 18
Place of publication United Kingdom
Publisher Wiley-Blackwell Publishing Ltd.
Language eng
Formatted abstract
Extrinsic neural and humoral influences on heart rate (fH) and ventilation frequency (fV) were examined following varying periods of post-surgical recovery in eight related Antarctic fish species inhabiting an array of inshore niches. Resting fH after recovery from handling was lower than previous reports, and the novel measurement of routine fH in free-swimming Dissostichus mawsoni (6.14 beats min-1, bpm) is the lowest recorded for any fish. The extent of cardio-depressive cholinergic (vagal) tonus explained the large range of fH among species and varied with behavioural repertoire, being lower in the more active species, apart from Notothenia coriiceps. Adrenergic tonus was low compared with cholinergic tonus, with the exception of Trematomus newnesi. Hence, high cardiac cholinergic tonus may be a genotypic trait of the notothenioids that diverged with ecotype. Power spectral analysis showed that the vagal influence produced comparable spectra among species of similar morphology and ecotype. Removal of autonomic tonus resulted in a remarkably similar intrinsic fH between species. Simultaneous measurements of cardio-respiratory variables and oxygen consumption (ṀO2) were made in the benthic Trematomus bernacchii and cryopelagic Pagothenia borchgrevinki. The slopes of the relationship between fH and ṀO2 were similar. Trematomus bernacchii, however, had a higher ṀO2 for a given fH than P. borchgrevinki, and P. borchgrevinki required a two-fold larger range in fH to reach a similar maximum ṀO2, suggesting that there is a difference in cardiovascular fitness between the two species. Overall, the data suggest that cardio-respiratory control in Antarctic nototheniids is largely determined by activity levels associated with a given ecotype.

Keyword Heart rate variability
Oxygen consumption
Power spectral analysis
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 4 times in Thomson Reuters Web of Science Article | Citations
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Created: Thu, 03 Sep 2009, 08:50:11 EST by Mr Andrew Martlew on behalf of School of Biological Sciences