Foraging behaviour of the epaulette shark Hemiscyllium ocellatum is not affected by elevated CO2

Heinrich, Dennis D.U., Watson, Sue-Ann, Rummer, Jodie L., Brandl, Simon J., Simpfendorfer, Colin A., Heupel, Michelle R., and Munday, Philip L. (2016) Foraging behaviour of the epaulette shark Hemiscyllium ocellatum is not affected by elevated CO2. ICES Journal of Marine Science, 73 (3). pp. 633-640.

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Increased oceanic uptake of atmospheric carbon dioxide (CO2) is a threat to marine organisms and ecosystems. Among the most dramatic consequences predicted to date are behavioural impairments in marine fish which appear to be caused by the interference of elevated CO2 with a key neurotransmitter receptor in the brain. In this study, we tested the effects of elevated CO2 on the foraging and shelter-seeking behaviours of the reef-dwelling epaulette shark, Hemiscyllium ocellatum. Juvenile sharks were exposed for 30 d to control CO2 (400 matm) and two elevated CO2 treatments (615 and 910 matm), consistent with medium- and high-end projections for ocean pCO2 by 2100. Contrary to the effects observed in teleosts and in some other sharks, behaviour of the epaulette shark was unaffected by elevated CO2. A potential explanation is the remarkable adaptation of H. ocellatum to low environmental oxygen conditions (hypoxia) and diel fluctuations in CO2 encountered in their shallow reef habitat. This ability translates into behavioural tolerance of near-future ocean acidification, suggesting that behavioural tolerance and subsequent adaptation to projected future CO2 levels might be possible in some other fish, if adaptation can keep pace with the rate of rising CO2 levels.

Item ID: 39939
Item Type: Article (Research - C1)
ISSN: 1095-9289
Keywords: carbon dioxide, climate change, elasmobranch, foraging behaviour, hypercapnia
Funders: ARC Centre of Excellence for Coral Reef Studies, James Cook University, Centre for Tropical Fisheries and Aquaculture
Date Deposited: 06 Aug 2015 01:41
FoR Codes: 41 ENVIRONMENTAL SCIENCES > 4101 Climate change impacts and adaptation > 410102 Ecological impacts of climate change and ecological adaptation @ 50%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 20%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 30%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 50%
96 ENVIRONMENT > 9603 Climate and Climate Change > 960399 Climate and Climate Change not elsewhere classified @ 50%
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