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Strategies of dissolved inorganic carbon use in macroalgae across a gradient of terrestrial influence: implications for the Great Barrier Reef in the context of ocean acidification

Coral Reefs volume 35, pages 1327–1341 (2016)Cite this article

Abstract

Macroalgae are generally used as indicators of coral reef status; thus, understanding the drivers and mechanisms leading to increased macroalgal abundance are of critical importance. Ocean acidification (OA) due to elevated carbon dioxide (CO2) concentrations has been suggested to stimulate macroalgal growth and abundance on reefs. However, little is known about the physiological mechanisms by which reef macroalgae use CO2 from the bulk seawater for photosynthesis [i.e., (1) direct uptake of bicarbonate (HCO3 −) and/or CO2 by means of carbon concentrating mechanisms (CCM) and (2) the diffusive uptake of CO2], which species could benefit from increased CO2 or which habitats may be more susceptible to acidification-induced algal proliferations. Here, we provide the first quantitative examination of CO2-use strategies in coral reef macroalgae and provide information on how the proportion of species and the proportional abundance of species utilising each of the carbon acquisition strategies varies across a gradient of terrestrial influence (from inshore to offshore reefs) in the Great Barrier Reef (GBR). Four macroalgal groups were identified based on their carbon uptake strategies: (1) CCM-only (HCO3 − only users); (2) CCM-HCO3 −/CO2 (active uptake HCO3 − and/or CO2 use); (3) Non-CCM species (those relying on diffusive CO2 uptake); and (4) Calcifiers. δ13C values of macroalgae, confirmed by pH drift assays, show that diffusive CO2 use is more prevalent in deeper waters, possibly due to low light availability that limits activity of CCMs. Inshore shallow reefs had a higher proportion of CCM-only species, while reefs further away from terrestrial influence and exposed to better water quality had a higher number of non-CCM species than inshore and mid-shelf reefs. As non-CCM macroalgae are more responsive to increased seawater CO2 and OA, reef slopes of the outer reefs are probably the habitats most vulnerable to the impacts of OA. Our results suggest a potentially important role of carbon physiology in structuring macroalgal communities in the GBR.

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Acknowledgments

We are grateful for help in the field from A. Hoey and C.P. Arango. A. Ordoñez, and C. Barrón assisted with the carbonate chemistry analyses. To B. Fry for comments on the manuscript. support was provided by an ARC Grant (DP120101778) awarded to GDP. This research was conducted under permit G11/34560 from the Great Barrier Reef Marine Park Authority.

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Authors and Affiliations

  1. Griffith School of Environment, Australian Rivers Institute – Coast and Estuaries, Nathan Campus, Griffith University, 170 Kessels Road, Nathan, Brisbane, QLD, 4111, Australia

    Guillermo Diaz-Pulido, Patrick Gartrell & Dien V. Tran

  2. Australian Research Council Centre of Excellence for Coral Reef Studies, Townsville, Australia

    Guillermo Diaz-Pulido

  3. Department of Botany, University of Otago, 464 Great King Street, Dunedin, 9016, New Zealand

    Christopher Cornwall

  4. School of Earth and Environment, and Australian Research Council Centre of Excellence for Coral Reef Studies, University of Western Australia, 35 Stilring Highway, Crawley, WA, 6009, Australia

    Christopher Cornwall

  5. Institute for Marine and Antarctic Studies, University of Tasmania, 20 Castray Esplanade, Battery Point, Hobart, TAS, 7004, Australia

    Christopher Cornwall & Catriona Hurd

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  1. Guillermo Diaz-Pulido
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  2. Christopher Cornwall
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  4. Catriona Hurd
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Correspondence to Guillermo Diaz-Pulido.

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Communicated by Biology Editor Dr. Anastazia Banaszak

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Diaz-Pulido, G., Cornwall, C., Gartrell, P. et al. Strategies of dissolved inorganic carbon use in macroalgae across a gradient of terrestrial influence: implications for the Great Barrier Reef in the context of ocean acidification. Coral Reefs 35, 1327–1341 (2016). https://doi.org/10.1007/s00338-016-1481-5

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  • DOI: https://doi.org/10.1007/s00338-016-1481-5

Keywords

  • Seaweeds
  • Carbon dioxide
  • Carbon concentrating mechanisms
  • Ocean acidification
  • Terrestrial runoff
  • Great Barrier Reef