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The influence of micro-topography and external bioerosion on coral-reef-building organisms: recruitment, community composition and carbonate production over time

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Abstract

The continued health and function of tropical coral reefs is highly dependent on the ability of reef-building organisms to build large, complex, three-dimensional structures that continue to accrete and evolve over time. The recent deterioration of reef health globally, including loss of coral cover, has resulted in significant declines in architectural complexity at a large, reef-scape scale. Interestingly, the fine-scale role of micro-structure in initiating and facilitating future reef development and calcium carbonate production has largely been overlooked. In this study, experimental substrates with and without micro-ridges were deployed in the lagoon at One Tree Island for 34 months. This study assessed how the presence or absence of micro-ridges promoted recruitment by key reef-building sclerobionts (corals and encrusters) and their subsequent development at micro (mm) and macro (cm) scales. Experimental plates were examined after 11 and 34 months to assess whether long-term successional and calcification processes on different micro-topographies led to convergent or divergent communities over time. Sclerobionts were most prevalent in micro-grooves when they were available. Interestingly, in shallow lagoon reef sites characterised by shoals of small parrotfish and low urchin abundance, flat substrates were also successfully recruited to. Mean rates of carbonate production were 374 ± 154 (SD) g CaCO3 m−2 yr−1 within the lagoon. Substrates with micro-ridges were characterised by significantly greater rates of carbonate production than smooth substrates. The orientation of the substrate and period of immersion also significantly impacted rates of carbonate production, with CaCO3 on cryptic tiles increasing by 28% between 11 and 34 months. In contrast, rates on exposed tiles declined by 35% over the same time. In conclusion, even at sites characterised by small-sized parrotfish and low urchin density, micro-topography is an important settlement niche clearly favouring sclerobiont early life-history processes and subsequent carbonate production.

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Acknowledgements

JM thanks Rebecca Fox for thoughtful discussion throughout this study and helpful comments on this manuscript, and Terry Neeman, ANU statistician, for advice. JM was funded by an Australian Research Council Discovery Early Career Researcher Award. All fieldwork was undertaken with the permission of the Great Barrier Reef Marine Park Authority (GBRMPA Permit Number G12.35021.1) and One Tree Island Research Station. Special thanks for help in the field at One Tree Island to Rebecca Fox, Adam Leavesley, Chris Bloomfield and Christine Schoenberg. JM thanks three reviewers for thoughtful input.

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  1. Research School of Biology and Research School of Earth Sciences, Australian National University, Canberra, ACT, 0200, Australia

    Jennie Mallela

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Correspondence to Jennie Mallela.

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Communicated by Biology Editor Dr. Mark J.A. Vermeij

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Mallela, J. The influence of micro-topography and external bioerosion on coral-reef-building organisms: recruitment, community composition and carbonate production over time. Coral Reefs 37, 227–237 (2018). https://doi.org/10.1007/s00338-017-1650-1

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