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Abstract

Dissolved inorganic carbon (DIC) assimilation is essential to the reef-building capacity of crustose coralline algae (CCA). Little is known, however, about the DIC uptake strategies and their potential plasticity under ongoing ocean acidification (OA) and warming. The persistence of CCA lineages throughout historical oscillations of pCO2 and temperature suggests that evolutionary history may play a role in selecting for adaptive traits. We evaluated the effects of pCO2 and temperature on the plasticity of DIC uptake strategies and associated energetic consequences in reef-building CCA from different evolutionary lineages. We simulated past, present, moderate (IPCC RCP 6.0) and high pCO2 (RCP 8.5) and present and high (RCP 8.5) temperature conditions and quantified stable carbon isotope fractionation (13ε), organic carbon content, growth and photochemical efficiency. All investigated CCA species possess CO2-concentrating mechanisms (CCMs) and assimilate CO2 via diffusion to varying degrees. Under OA and warming, CCA either increased or maintained CCM capacity, which was associated with overall neutral effects on metabolic performance. More basal taxa, Sporolithales and Hapalidiales, had greater capacity for diffusive CO2 use than Corallinales. We suggest that CCMs are an adaptation that supports a robust carbon physiology and are likely responsible for the endurance of CCA in historically changing oceans.

Item Type:	Article
Authors/Creators:	Bergstrom, E and Ordonez, A and Ho, M and Hurd, C and Fry, B and Diaz-Pulido, G
Keywords:	climate change, ocean acidification, temperature, coralline algae, seaweed, ocean warming, isotopes, fractionation
Journal or Publication Title:	Marine Environmental Research
Publisher:	Elsevier Sci Ltd
ISSN:	0141-1136
DOI / ID Number:	https://doi.org/10.1016/j.marenvres.2020.105107
Copyright Information:	© 2020 Elsevier Ltd. All rights reserved.
Related URLs:	Google Scholar: Hurd, C UTAS Profile: Hurd, C
Item Statistics:	View statistics for this item

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