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Hypoxia tolerance is conserved across genetically distinct sub-populations of an iconic, tropical Australian teleost (Lates calcarifer)


Collins, GM and Clark, TD and Rummer, JL and Carton, AG, Hypoxia tolerance is conserved across genetically distinct sub-populations of an iconic, tropical Australian teleost (Lates calcarifer), Conservation Physiology, 1, (1) Article cot029. ISSN 2051-1434 (2013) [Refereed Article]


Copyright Statement

The Author 2013. Licensed under Creative Commons Attribution 3.0 Unported (CC BY 3.0)

DOI: doi:10.1093/conphys/cot029


Tropical coastal systems are particularly prone to periods of environmental hypoxia, which can result from organismal respiration as well as thermal stratification, and may be further exacerbated by anthropogenic disturbances. In this study, we used five genetically distinct sub-populations of Australian barramundi (Lates calcarifer) to examine the extent of intraspecific variability in hypoxia tolerance. Fish were maintained at two temperatures (26 or 36C), representing the seasonal thermal range for this species across its tropical distribution in Australia. All fish maintained a constant oxygen consumption rate (O2) as air saturation of the water decreased from 100% down to a critical oxygen saturation ([O2]crit) of 15.44  3.20 and 21.07  3.92% (means  SD) at 26 and 36C, respectively. Mean [O2]crit, used as a performance measure of hypoxia tolerance, did not differ between sub-populations. No differences were found for resting O2 between sub-populations at 26C, but modest differences were detected between two sub-populations at 36C (3.36  0.62 and 2.83  0.27 mg O2 kg−1 min−1 for Gladstone and Broome sub-populations, respectively). Resting O2 was lower for sub-populations at 26C (1.46  0.26 mg O2 kg−1 min−1) than at 36C (3.10  0.43 mg O2 kg−1 min−1), with a temperature coefficient (Q10) of 2.12  0.30. We conclude that both hypoxia tolerance and resting O2 are conserved across the distribution of barramundi in Australia, which reflects the capacity of this species to cope in environments with large fluctuations in both temperature and dissolved oxygen.

Item Details

Item Type:Refereed Article
Keywords:barramundi, climate change, critical oxygen saturation hypoxia, Lates calcarifer, tropical
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal behaviour
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Coastal or estuarine biodiversity
UTAS Author:Clark, TD (Dr Timothy Clark)
ID Code:103350
Year Published:2013
Web of Science® Times Cited:80
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-06
Last Modified:2017-10-31
Downloads:196 View Download Statistics

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