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A product of its environment: the epaulette shark (Hemiscyllium ocellatum) exhibits physiological tolerance to elevated environmental CO2

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dc.contributor Australian Institute Of Marine Science
dc.contributor Univ Tasmania
dc.contributor Sch Earth & Environm Sci
dc.contributor Imas
dc.contributor Sch Marine & Trop Biol
dc.contributor James Cook Univ
dc.contributor University Of Tasmania
dc.contributor Australian Inst Marine Sci
dc.contributor Arc Ctr Excellence Coral Reef Studies
dc.contributor Ctr Sustainable Trop Fisheries & Aquaculture
dc.contributor James Cook University
dc.contributor.author MUNDAY, PHILIP L.
dc.contributor.author HEINRICH, DENNIS D. U.
dc.contributor.author RUMMER, JODIE L.
dc.contributor.author MORASH, ANDREA J.
dc.contributor.author WATSON, SUE-ANN
dc.contributor.author SIMPFENDORFER, COLIN A.
dc.contributor.author HEUPEL, MICHELLE R.
dc.date.accessioned 2015-05-04T00:44:01Z
dc.date.accessioned 2017-03-21T01:01:23Z
dc.date.accessioned 2017-03-21T01:01:23Z
dc.date.accessioned 2019-07-08T02:14:40Z
dc.date.available 2015-05-04T00:44:01Z
dc.date.available 2017-03-21T01:01:23Z
dc.date.available 2017-03-21T01:01:23Z
dc.date.available 2019-07-08T02:14:40Z
dc.date.issued 2014-01-01
dc.identifier.citation Heinrich DDU, Rummer JL, Morash AJ, Watson S, Simpfendorfer CA, Heupel MR, Munday PL (2014) A product of its environment: the epaulette shark (Hemiscyllium ocellatum) exhibits physiological tolerance to elevated environmental CO2. Conservation Physiology 2(1): doi: 10.1093/conphys/cou047 en_US
dc.identifier.issn 2051-1434
dc.identifier.uri http://epubs.aims.gov.au/11068/11002
dc.description.abstract Ocean acidification, resulting from increasing anthropogenic CO2 emissions, is predicted to affect the physiological performance of many marine species. Recent studies have shown substantial reductions in aerobic performance in some teleost fish species, but no change or even enhanced performance in others. Notably lacking, however, are studies on the effects of near-future CO2 conditions on larger meso and apex predators, such as elasmobranchs. The epaulette shark (Hemiscyllium ocellatum) lives on shallow coral reef flats and in lagoons, where it may frequently encounter short-term periods of environmental hypoxia and elevated CO2, especially during nocturnal low tides. Indeed, H. ocellatum is remarkably tolerant to short periods (hours) of hypoxia, and possibly hypercapnia, but nothing is known about its response to prolonged exposure. We exposed H. ocellatum individuals to control (390 mu atm) or one of two near-future CO2 treatments (600 or 880 mu atm) for a minimum of 60 days and then measured key aspects of their respiratory physiology, namely the resting oxygen consumption rate, which is used to estimate resting metabolic rate, and critical oxygen tension, a proxy for hypoxia sensitivity. Neither of these respiratory attributes was affected by the long-term exposure to elevated CO2. Furthermore, there was no change in citrate synthase activity, a cellular indicator of aerobic energy production. Plasma bicarbonate concentrations were significantly elevated in sharks exposed to 600 and 880 mu atm CO2 treatments, indicating that acidosis was probably prevented by regulatory changes in acid-base relevant ions. Epaulette sharks may therefore possess adaptations that confer tolerance to CO2 levels projected to occur in the ocean by the end of this century. It remains uncertain whether other elasmobranchs, especially pelagic species that do not experience such diurnal fluctuations in their environment, will be equally tolerant.
dc.description.sponsorship This work was supported by funding from the School of Marine and Tropical Biology ( D. D. U. H., P. L. M.); the School of Earth and Environmental Science ( C. A. S., M. R. H.); AIMS@JCU ( D. D. U. H., M. R. H.); and the Australian Research Council Centre of Excellence for Coral Reef Studies ( J. L. R., P.L.M.).
dc.description.sponsorship This work was supported by funding from the School of Marine and Tropical Biology (D.D.U.H., P.L.M.); the School of Earth and Environmental Science (C.A.S., M.R.H.); AIMS@JCU (D.D.U.H., M.R.H.); and the Australian Research Council Centre of Excellence for Coral Reef Studies (J.L.R., P.L.M.). en_US
dc.description.uri http://conphys.oxfordjournals.org/content/2/1/cou047.full?sid=03d0c00d-6faf-4867-ac89-efdb679c1296 en_US
dc.language English
dc.language.iso en en_US
dc.publisher Oxford Journals - OPEN en_US
dc.relation.ispartof Null
dc.rights Attribution 3.0 Australia *
dc.rights.uri http://creativecommons.org/licenses/by/3.0/au/ *
dc.subject Hypoxia Tolerance
dc.subject Ecology
dc.subject Biodiversity Conservation
dc.subject Physiology
dc.subject Environmental Sciences & Ecology
dc.subject Ecophysiology
dc.subject Environmental Sciences
dc.subject Climate Change
dc.subject Biodiversity & Conservation
dc.subject Elasmobranch
dc.subject Ocean Acidification
dc.title A product of its environment: the epaulette shark (Hemiscyllium ocellatum) exhibits physiological tolerance to elevated environmental CO2
dc.type journal article en_US
dc.identifier.doi 10.1093/conphys/cou047
dc.identifier.wos WOS:000209703800029


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