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Climate change and the performance of larval coral reef fishes: the interaction between temperature and food availability


McLeod, IM and Rummer, JL and Clark, TD and Jones, GP and McCormick, MI and Wenger, AS and Munday, PL, Climate change and the performance of larval coral reef fishes: the interaction between temperature and food availability, Conservation Physiology, 1, (1) Article cot024. ISSN 2051-1434 (2013) [Refereed Article]

DOI: doi:10.1093/conphys/cot024


Climate-change models predict that tropical ocean temperatures will increase by 23C this century and affect plankton communities that are food for marine fish larvae. Both temperature and food supply can influence development time, growth, and metabolism of marine fishes, particularly during larval stages. However, little is known of the relative importance and potential interacting effects of ocean warming and changes to food supply on the performance of larval fishes. We tested this for larvae of the coral reef anemonefish, Amphiprion percula, in an orthogonal experiment comprising three temperatures and three feeding schedules. Temperatures were chosen to represent present-day summer averages (29.2C) and end-of-century climate change projections of +1.5C (30.7C) and +3C (32.2C). Feeding schedules were chosen to represent a reduction in access to food (fed daily, every 2 days, or every 3 days). Overall, larvae took longer to settle at higher temperatures and with less frequent feeding, and there was a significant interaction between these factors. Time to metamorphosis was fastest in the 30.7oC and high food availability treatment (10.5  0.2 days) and slowest in the 32.2oC and low food availability treatment (15.6  0.5 days; i.e. 50% faster). Fish from the lower feeding regimens had a lower body condition and decreased survivorship to metamorphosis. Routine oxygen consumption rates were highest for fish raised at 32.2C and fed every third day (162  107 mg O2  kg−1 h−1) and lowest for fish raised at 29.2C and fed daily (122  101 mg O2 kg−1 h−1; i.e. 35% lower). The elevated routine oxygen consumption rate, and therefore greater energy use at higher temperatures, may leave less energy available for growth and development, resulting in the longer time to metamorphosis. Overall, these results suggest that larval fishes will be severely impacted by climate-change scenarios that predict both elevated temperatures and reduced food supply.

Item Details

Item Type:Refereed Article
Keywords:connectivity, developmental rate, population viability, thermal reaction norm
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:103352
Year Published:2013
Web of Science® Times Cited:50
Deposited By:IMAS Research and Education Centre
Deposited On:2015-10-06
Last Modified:2018-03-20

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