Intra-colony spatial variance of oxyregulation and hypoxic thresholds for key Acropora coral species

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  • Nicole J. Dilernia
  • Stephen Woodcock
  • Emma F. Camp
  • David J. Hughes
  • Kuhl, Michael
  • David J. Suggett
Oxygen (O2) availability is essential for healthy coral reef functioning, yet how continued loss of dissolved O2 via ocean deoxygenation impacts performance of reef building corals remains unclear. Here, we examine how intra-colony spatial geometry of important Great Barrier Reef (GBR) coral species Acropora may influence variation in hypoxic thresholds for upregulation, to better understand capacity to tolerate future reductions in O2 availability. We first evaluate the application of more streamlined models used to parameterise Hypoxia Response Curve data, models that have been used historically to identify variable oxyregulatory capacity. Using closed-system respirometry to analyse O2 drawdown rate, we show that a two-parameter model returns similar outputs as previous 12th-order models for descriptive statistics such as the average oxyregulation capacity (Tpos) and the ambient O2 level at which the coral exerts maximum regulation effort (Pcmax), for diverse Acropora species. Following an experiment to evaluate whether stress induced by coral fragmentation for respirometry affected O2 drawdown rate, we subsequently identify differences in hypoxic response for the interior and exterior colony locations for the species Acropora abrotanoides, Acropora cf. microphthalma and Acropora elseyi. Average regulation capacity across species was greater (0.78–1.03 ± SE 0.08) at the colony interior compared with exterior (0.60–0.85 ± SE 0.08). Moreover, Pcmax occurred at relatively low pO2 of <30% (±1.24; SE) air saturation for all species, across the colony. When compared against ambient O2 availability, these factors corresponded to differences in mean intra-colony oxyregulation, suggesting that lower variation in dissolved O2 corresponds with higher capacity for oxyregulation. Collectively, our data show that intra-colony spatial variation affects coral oxyregulation hypoxic thresholds, potentially driving differences in Acropora oxyregulatory capacity.
OriginalsprogEngelsk
Artikelnummere11100
TidsskriftEcology and Evolution
Vol/bind14
Udgave nummer3
Antal sider16
ISSN2045-7758
DOI
StatusUdgivet - 2024

Bibliografisk note

Funding Information:
This research is supported by an Australian Government Research Training Program Scholarship (N.J.D.) and an Australian Research Council Discovery Project (DP230100210) (awarded to: D.J.S., E.F.C., and M.K.). M.K. also acknowledges additional support from the Gordon and Betty Moore Foundation (grant no. GBMF9206; https://doi.org/10.37807/GBMF9206 ).

Funding Information:
We wish to express thanks to two anonymous Reviewers, whose comments greatly improved our manuscript. The authors would like to express thanks and acknowledge the staff and owners of Wavelength Reef Cruises for their assistance in providing reef access. As well as the Great Barrier Reef Marine Park Authority for their continued support and issuance of Permit No. G20/43740.1. N.J.D. would also like to specifically acknowledge Future Reefs Team members Lorna Howlett, Christine Roper, Paige Strudwick and Gemma Gillette, as well as Natasha Bartels and Amanda Grima, for their assistance during field work and sample collection in February 2022. Open access publishing facilitated by University of Technology Sydney, as part of the Wiley - University of Technology Sydney agreement via the Council of Australian University Librarians.

Publisher Copyright:
© 2024 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

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