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Coral Reefs

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Evaluating measurements of coral reef net ecosystem calcification rates

  • T. A. CourtneyEmail author
  • A. J. Andersson
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Abstract

Monitoring the rates and drivers of coral reef net ecosystem calcification (NEC) under anthropogenic environmental change is critical for predicting associated changes in reef structures and ecosystem services. However, NEC studies to date show weak agreement between studies and notably reveal no relationship between NEC and benthic calcifier cover. In this study, we tested for the sensitivity of calculated NEC to uncertainties in seawater depths and residence times (± 83% relative to 6 m and 6 h, respectively) using a coral reef total alkalinity (AT) simulator (reefCATS) and found that these errors can interact to drive large asymmetric uncertainties ranging from − 91% to + 1000% in NEC. Furthermore, numerical simulations of hypothetical NEC for coral populations occupying reefs with increasing structural complexity (rugosity = 1–4) showed that the effects of reef-scale rugosity on NEC can be as important as benthic community composition. As a result, uncertainties in seawater depth, residence time, and/or reef structural complexity are enough to mask any potential real correlation between NEC and percent calcifier cover in the field. To improve comparability and validity of NEC studies, we recommend that future studies place a high degree of scrutiny on measurements of seawater hydrodynamics, report all NEC equation parameters ± uncertainties, and ideally include benthic community composition and structural complexity data to further explore the relationship between NEC and calcifier cover.

Keywords

Coral reef Net ecosystem calcification Structural complexity Rugosity Ecosystem services Climate change Biogeochemistry Ecosystem monitoring 

Notes

Acknowledgements

We are grateful to Tyler Cyronak for providing insightful discussions of chemistry-based NEC measurements, Carlos Minces for inspiration of the reefCATS models, and two anonymous reviewers who improved this manuscript with their helpful insights. Funding was provided by NSF DGE-1650112 (TAC) and NSF OCE 12-55042 (AJA). All data from the literature review of previous NEC studies are presented in the supplementary NEC review datasheet.

Author contributions

TAC and AJA conceived the study. TAC constructed the reefCATS model simulations and wrote the first draft of the manuscript with input from AJA.

Compliance with ethical standards

Conflict of interest

On behalf of all authors, the corresponding author states that there is no conflict of interest.

Supplementary material

338_2019_1828_MOESM1_ESM.xlsx (18 kb)
Supplementary material 1 (XLSX 17 kb)

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Scripps Institution of OceanographyUniversity of California, San DiegoLa JollaUSA

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