Impacts of increased ocean temperatures on a low-latitude coral reef fish - processes related to oxygen uptake and delivery

Rodgers, G.G., Rummer, J.L., Johnson, L.K., and McCormick, M. (2019) Impacts of increased ocean temperatures on a low-latitude coral reef fish - processes related to oxygen uptake and delivery. Journal of Thermal Biology, 79. pp. 95-102.

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Abstract

Increasing temperatures are expected to significantly affect the physiological performance of ectotherms, particularly in tropical locations. The shape of an organism's thermal reaction norm can provide important information on its capacity to persist under climate change scenarios; however, difficulty lies in choosing a measurable trait that best depicts physiological performance. This study investigated the effects of elevated temperatures on processes related to oxygen uptake and delivery, including oxygen consumption, haematology, and tissue health for a low-latitude population of coral reef damselfish. Acanthochromis polyacanthus were collected from the Torres Strait (10 degrees 31-46'S, 142 degrees 20-35'E) and maintained at current average ocean temperatures (+0 C; seasonally cycling), + 1.5 degrees C and + 3 degrees C higher than present day temperatures for 10 months. Aerobic performance indicated a limit to metabolic function at + 3 degrees C (33 degrees C), following an increase in aerobic capacity at + 1.5 degrees C (31.5 degrees C). Neither haematological parameters nor gill morphology showed the same improvement in performance at + 1.5 degrees C. Gill histopathology provided the first indicator of a decline in organism health, which corresponded with mortality observations from previous research. Findings from this study suggest thermal specialisation in this low-latitude population as well as variation in thermal sensitivity, depending on the physiological trait.

Item ID: 57094
Item Type: Article (Research - C1)
ISSN: 1879-0992
Keywords: Thermal tolerance, Acanthochromis polyacanthus, Physiological performance, Climate change, Thermal reaction norm
Copyright Information: © 2018 Elsevier Ltd. All rights reserved.
Funders: Australian Research Council (ARC), ARC Centre of Excellence for Coral Reef Studies (CECRS), James Cook University (JCU)
Projects and Grants: ARC grant (DP120101993), JCU Higher Degree Research Enhancement Funding Scheme
Research Data: http://doi.org/10.25903/5c0eff685e349
Date Deposited: 13 Feb 2019 07:40
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060205 Marine and Estuarine Ecology (incl Marine Ichthyology) @ 100%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960808 Marine Flora, Fauna and Biodiversity @ 100%
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