Elevated CO₂ and heatwave conditions affect the aerobic and swimming performance of juvenile Australasian snapper

McMahon, Shannon J., Parsons, Darren M., Donelson, Jennifer M., Pether, Steve M.J., and Munday, Philip L. (2020) Elevated CO₂ and heatwave conditions affect the aerobic and swimming performance of juvenile Australasian snapper. Marine Biology: international journal on life in oceans and coastal waters, 167 (1). 6.

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As climate change advances, coastal marine ecosystems are predicted to experience increasingly frequent and intense heatwaves. At the same time, already variable CO₂ levels in coastal habitats will be exacerbated by ocean acidification. High temperature and elevated CO₂ levels can be stressful to marine organisms, especially during critical early life stages. Here, we used a fully cross-factored experiment to test the effects of simulated heatwave conditions (+ 4 °C) and elevated CO₂ (1000 µatm) on the aerobic physiology and swimming performance of juvenile Australasian snapper, Chrysophrys auratus, an ecologically and economically important mesopredatory fish. Both elevated temperature and elevated CO₂ increased resting metabolic rate of juvenile snapper, by 21-22% and 9-10%, respectively. By contrast, maximum metabolic rate was increased by elevated temperature (16-17%) and decreased by elevated CO₂ (14-15%). The differential effects of elevated temperature and elevated CO₂ on maximum metabolic rate resulted in aerobic scope being reduced only in the elevated CO₂ treatment. Critical swimming speed also increased with elevated temperature and decreased with elevated CO₂, matching the results for maximum metabolic rate. Periods of elevated CO₂ already occur in the coastal habitats occupied by juvenile snapper, and these events will be exacerbated by ongoing ocean acidification. Our results show that elevated CO₂ has a greater effect on metabolic rates and swimming performance than heatwave conditions for juvenile snapper, and could reduce their overall performance and potentially have negative consequences for population recruitment.

Item ID: 62490
Item Type: Article (Research - C1)
ISSN: 0025-3162
Copyright Information: © Springer-Verlag GmbH Germany, part of Springer Nature 2019.
Funders: New Zealand Ministry of Primary Industries (NZMPI), New Zealand Business Innovation and Employment (NZBIE), ARC Centre of Excellence for Coral Reef Studies
Projects and Grants: NZMPI ZBD201403), NZBIE Coastal Impact: Rate, Impact and Management project
Research Data: http://dx.doi.org/10.25903/5db68cc96296b
Date Deposited: 11 Mar 2020 07:36
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310305 Marine and estuarine ecology (incl. marine ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9603 Climate and Climate Change > 960305 Ecosystem Adaptation to Climate Change @ 100%
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