Diel CO2 cycles do not modify juvenile growth, survival and otolith development in two coral reef fish under ocean acidification

Jarrold, Michael D., and Munday, Philip L. (2018) Diel CO2 cycles do not modify juvenile growth, survival and otolith development in two coral reef fish under ocean acidification. Marine Biology: international journal on life in oceans and coastal waters, 165 (3). 49.

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Abstract

Recent studies show that daily variation in pCO(2) levels can modify the life-history and calcification responses of marine organisms to ocean acidification. The early life stages of coral reef fish exhibit varied growth, survival and otolith development responses to elevated pCO(2), yet no studies to date have considered the substantial diel pCO(2) cycles that occur in shallow reef habitats. Here, we reared three clutches of juvenile Acanthochromis polyacanthus and Amphiprion percula under control (500 mu atm), stable, elevated (1000 mu atm) and diel cycling, elevated (1000 +/- 300 and 1000 +/- 500 mu atm) pCO(2) for 11 and 6 weeks, respectively. Survival was unaffected by exposure to either elevated stable or diel cycling pCO(2) conditions in both species. For A. polyacanthus there was a non-significant trend of decreased standard length and wet weight under stable, elevated pCO(2) conditions, whereas values in both the diel cycling treatments were closer to those observed under control conditions. A similar non-significant trend was observed for Am. percula, except that exposure to stable, elevated pCO(2) conditions resulted in slightly longer and heavier fish. Finally, otolith size, shape and symmetry in both species were unaffected by exposure to either elevated stable or diel cycling pCO(2) conditions. Overall, our results suggest that the growth, survival and otolith development of juvenile coral reef fishes under ocean acidification is unlikely to be affected, in isolation, by diel cycles in pCO(2).

Item ID: 53599
Item Type: Article (Research - C1)
ISSN: 1432-1793
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Copyright Information: © Springer-Verlag GmbH Germany, part of Springer Nature 2018
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A version of this publication was included as Chapter 2 of the following PhD thesis: Jarrold, Michael D. (2018) Effects of diel CO₂ cycles on the early development and behaviour of coral reef fishes under ocean acidification. PhD thesis, James Cook University, which is available Open Access in ResearchOnline@JCU. Please see the Related URLs for access.

Funders: Australian Research Council (ARC)
Projects and Grants: ARC Future Fellowship
Date Deposited: 09 May 2018 08:41
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050211 Wildlife and Habitat Management @ 100%
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