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Experimental manipulations of tissue oxygen supply do not affect warming tolerance of European perch

Citation

Brijs, J and Jutfelt, F and Clark, TD and Grans, A and Ekstrom, A and Sandblom, E, Experimental manipulations of tissue oxygen supply do not affect warming tolerance of European perch, Journal of Experimental Biology, 218, (15) pp. 2448-2454. ISSN 0022-0949 (2015) [Refereed Article]

Copyright Statement

Copyright 2015 The Company of Biologists Ltd

DOI: doi:10.1242/jeb.121889

Abstract

A progressive inability of the cardiorespiratory system to maintain systemic oxygen supply at elevated temperatures has been suggested to reduce aerobic scope and the upper thermal limit of aquatic ectotherms. However, few studies have directly investigated the dependence of thermal limits on oxygen transport capacity. By manipulating oxygen availability (via environmental hyperoxia) and blood oxygen carrying capacity (via experimentally induced anaemia) in European perch (Perca fluviatilis Linneaus), we investigated the effects of oxygen transport capacity on aerobic scope and the critical thermal maximum (CTmax). Hyperoxia resulted in a twofold increase in aerobic scope at the control temperature of 23C, but this did not translate to an elevated CTmax in comparison with control fish (34.60.1 versus 34.00.5C, respectively). Anaemia (∼43% reduction in haemoglobin concentration) did not cause a reduction in aerobic scope or CTmax (33.80.3C) compared with control fish. Additionally, oxygen consumption rates of anaemic perch during thermal ramping increased in a similar exponential manner to that in control fish, highlighting that perch have an impressive capacity to compensate for a substantial reduction in blood oxygen carrying capacity. Taken together, these results indicate that oxygen limitation is not a universal mechanism determining the CTmax of fishes.

Item Details

Item Type:Refereed Article
Keywords:metabolism, oxygen consumption, aerobic scope, hyperoxia, anaemia, temperature
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal Behaviour
Objective Division:Environment
Objective Group:Flora, Fauna and Biodiversity
Objective Field:Coastal and Estuarine Flora, Fauna and Biodiversity
UTAS Author:Clark, TD (Dr Timothy Clark)
ID Code:103005
Year Published:2015
Web of Science® Times Cited:25
Deposited By:IMAS Research and Education Centre
Deposited On:2015-09-15
Last Modified:2017-10-31
Downloads:0

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