Responses of a coral reef shark acutely exposed to ocean acidification conditions

Rummer, Jodie L., Bouyoucos, Ian A., Mourier, Johann, Nakamura, Nao, and Planes, Serge (2020) Responses of a coral reef shark acutely exposed to ocean acidification conditions. Coral Reefs, 39. pp. 1215-1220.

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Abstract

Anthropogenic ocean acidification (OA) is a threat to coral reef fishes, but few studies have investigated responses of high-trophic-level predators, including sharks. We tested the effects of 72-hr exposure to OA-relevant elevated partial pressures of carbon dioxide (pCO2) on oxygen uptake rates, acid–base status, and haematology of newborn tropical blacktip reef sharks (Carcharhinus melanopterus). Acute exposure to end-of-century pCO2 levels resulted in elevated haematocrit (i.e. stress or compensation of oxygen uptake rates) and blood lactate concentrations (i.e. prolonged recovery) in the newborns. Conversely, whole blood and mean corpuscular haemoglobin concentrations, blood pH, estimates of standard and maximum metabolic rates, and aerobic scope remained unaffected. Taken together, newborn blacktip reef sharks appear physiologically robust to end-of-century pCO2 levels, but less so than other, previously investigated, tropical carpet sharks. Our results suggest peak fluctuating pCO2 levels in coral reef lagoons could still physiologically affect newborn reef sharks, but studies assessing the effects of long-term exposure and in combination with other anthropogenic stressors are needed.

Item ID: 65082
Item Type: Article (Research - C1)
ISSN: 1432-0975
Keywords: Acid–base, Blacktip reef shark, Haematology, Climate change, Oxygen uptake rates, Physiology
Copyright Information: (C) Springer-Verlag GmbH Germany, part of Springer Nature 2020
Funders: Australian Research Council (ARC), L'Oréal-United Nations Educational, Scientific and Cultural Organization (UNESCO) Women in Science Foundation, Institut des Recifs Coralliens du Pacifique Fellowship, James Cook University, Institute for Research and Development, ARC Centre of Excellence for Coral Reef Studies
Projects and Grants: ARC PDE150101266
Date Deposited: 18 Nov 2020 02:15
FoR Codes: 06 BIOLOGICAL SCIENCES > 0699 Other Biological Sciences > 069902 Global Change Biology @ 50%
06 BIOLOGICAL SCIENCES > 0606 Physiology > 060604 Comparative Physiology @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970106 Expanding Knowledge in the Biological Sciences @ 100%
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