Marine & Environmental Sciences Faculty Articles
Growth impacts in a changing ocean: insights from two coral reef fishes in an extreme environment
Ocean warming, TSR, Coping mechanism, Plasticity, Stress, Physiology, Oxygen limitation
Determining the life-history consequences for fishes living in extreme and variable environments will be vital in predicting the likely impacts of ongoing climate change on reef fish demography. Here, we compare size-at-age and maximum body size of two common reef fish species (Lutjanus ehrenbergii and Pomacanthus maculosus) between the environmentally extreme Arabian/Persian Gulf (‘Arabian Gulf’) and adjacent comparably benign Oman Sea. Additionally, we use otolith increment width profiles to investigate the influence of temperature, salinity and productivity on the individual growth rates. Individuals of both species showed smaller size-at-age and lower maximum size in the Arabian Gulf compared to conspecifics in the less extreme and less variable environment of the Oman Sea, suggesting a life-history trade-off between size and metabolic demands. Salinity was the best environmental predictor of interannual growth across species and regions, with low growth corresponding to more saline conditions. However, salinity had a weaker negative effect on interannual growth of fishes in the Arabian Gulf than in the Oman Sea, indicating Arabian Gulf populations may be better able to acclimate to changing environmental conditions. Temperature had a weak positive effect on the interannual growth of fishes in the Arabian Gulf, suggesting that these populations may still be living within their thermal windows. Our results highlight the potential importance of osmoregulatory cost in impacting growth, and the need to consider the effect of multiple stressors when investigating the consequences of future climate change on fish demography.
This work was funded by a PhD scholarship from the University of Nottingham to DD and supported by NYU Abu Dhabi Marine Biology Core Technology Platform. JB's funding was supported by the NYUAD Water Research Center, funded by Tamkeen under the NYUAD Research Institute Award (project CG007), while GC's funding were supported by the American University of Sharjah (research Grant FRG19-M-G74). Field fish collection was carried with permission of the Environment Agency, Abu Dhabi (protocol No. EAD-TMBS- RP-0), and according to the NYU-Abu Dhabi animal ethics guidelines.
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Danielle D'Agostino, John A. Burt, Veronica Santinelli, Grace O. Vaughan, Ashely M. Fowler, Tom Reader, Brett M. Taylor, Andrew S. Hoey, Georgenes H. Cavalcante, Andrew G. Bauman, and David A. Feary. 2021. Growth impacts in a changing ocean: insights from two coral reef fishes in an extreme environment .Coral Reefs : 433 -446. https://nsuworks.nova.edu/occ_facarticles/1274.
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