Abstract
Water renewal exerts a preponderant role in eutrophication, yet few hydrodynamic indicators exist for performing quick and cost-effective assessments of ecosystem vulnerability. Using field data, we closed the water budget of a shallow coral reef lagoon recently exposed to high levels of nutrient loading that triggered green tides. Then, we tested the relevance of modelling flushing-time, a proxy of water renewal, from oceanic and atmospheric open access data. Water inflows in the lagoon were mainly driven by waves breaking on exposed reefs, but tide and wind also influenced water renewal during low-wave periods. Modelling flushing-time as a function of the wave features (significant wave height, direction, and period), tide, and wind direction provided the most convincing model, with greater contribution of wave height, and adequately reproduced observations for an independent dataset. Using this model to hindcast flushing-time over the period 2000–2019 highlighted that green tides that recently struck the area in January 2018 and June 2019 followed periods of slow water renewal, which therefore contributed to amplify the blooms. The analysis also demonstrated that renewal events even slower than those recorded in 2018–2019 are frequent in this lagoon, which highlights the high vulnerability of this UNESCO World Heritage Site to other pulses of nutrient loading. Since the methodology developed in this study can be easily applied to many other coastal barrier and fringing reefs, it offers a promising perspective for quick and cost-effective assessments of coral reef vulnerability to eutrophication and other ecosystem crises magnified by slow water renewal.
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Acknowledgements
We are grateful to R. Laigle, P. Laigle, G. Sarrailh, V. Bouvot, E. Le Tesson, J. Herlin, and C. Helleringer for their logistical support during field trips, to J. Lefèvre for sharing personal data regarding water surface slope at PGD, and to two anonymous reviewers who made constructive comments on the manuscript. The study was funded by the ELADE project, with operating budget supported by La province Sud and salary budget supported by Ifremer (grant C.458-19).
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The study was funded by the ELADE project, with operating budget supported by La province Sud, grant C.458–19 to Simon Van Wynsberge.
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Lalau, N., Van Wynsberge, S., Soulard, B. et al. A quick and cost-effective method for modelling water renewal in shallow coral reef lagoons. Coral Reefs 41, 1611–1626 (2022). https://doi.org/10.1007/s00338-022-02319-7
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DOI: https://doi.org/10.1007/s00338-022-02319-7