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Depth-related patterns in coral recruitment across a shallow to mesophotic gradient

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Abstract

There is currently very limited information around the spatial patterns of coral recruitment at mesophotic depths globally. This study investigated depth-related differences in coral recruitment patterns from shallow (~ 3 m) to mesophotic depths (~ 40 m) in the Indian Ocean. A new method is described for assessing coral recruitment, which allows for the improved study of recruitment patterns on deep reefs globally, as the method does not require SCUBA diving. This method allows for comparisons with other studies as there appears to be no influence on the density, composition, or settlement orientation of recruits relative to the most commonly used methods. Using this method, we investigated coral recruitment at Ningaloo Reef, Western Australia, finding the abundance of coral recruits varied significantly with depth and was highest at 25 m. The size of coral recruits changed significantly with depth, with larger recruits observed in shallower areas (3 and 8 m) than in deep areas. Distinct changes in settlement densities on tile surfaces occurred with increasing depth, with a shift to upper tile surfaces between 8 and 25 m, where the proportion of recruits increased from 10.72 to 87.69%, respectively. Overall counts of recruits were low, with minimal recruitment at the deepest sites and moderate but significant correlations between recruit numbers and hard coral cover were observed. This suggests that variations in larval supply, potentially coupled with larval behaviour and local-scale influences, limit exchange of larvae between depths and locations. This is consistent with genetic studies that show limited exchange between shallow and mesophotic reefs and points to a limited potential for mesophotic reefs to act as a source of larvae for impacted shallow reefs.

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Acknowledgements

We thank our funding agency, the BHP-CSIRO Ningaloo Outlook Marine Research Partnership, for support of this work. The views expressed herein are those of the authors and do not necessarily reflect the views of BHP or CSIRO. We thank the crew of the Keshi-Mer who assisted with the deployment and Christopher Doropolous and Ryan Crossing for help with retrieval.

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Authors and Affiliations

  1. School of Biological Sciences and Oceans Institute, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    Joseph A. Turner, Anna K. Cresswell & Russell C. Babcock

  2. CSIRO Oceans and Atmosphere, Indian Ocean Marine Research Centre, University of Western Australia, 35 Stirling Highway, Crawley, WA, 6009, Australia

    Joseph A. Turner, Damian P. Thomson, Anna K. Cresswell, Melanie Trapon & Russell C. Babcock

  3. CSIRO Oceans and Atmosphere, Dutton Park, Brisbane, QLD, 4001, Australia

    Russell C. Babcock

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  1. Joseph A. Turner
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Correspondence to Joseph A. Turner.

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Turner, J.A., Thomson, D.P., Cresswell, A.K. et al. Depth-related patterns in coral recruitment across a shallow to mesophotic gradient. Coral Reefs 37, 711–722 (2018). https://doi.org/10.1007/s00338-018-1696-8

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