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Depth gradients in abundance and functional roles suggest limited depth refuges for herbivorous fishes

Coral Reefs volume 40, pages 365–379 (2021)Cite this article

Abstract

As some types of disturbance to coral reefs are attenuated with depth, the resilience of herbivorous fish species utilizing shallow areas (< 30 m) is likely enhanced if their population footprint extends into adjacent deeper reef areas. Using field surveys from an isolated coral reef, off northwest Australia, we created data-driven models relating herbivorous fish communities to habitat across an extended depth range (4–76 m). Models assessed variations in functional redundancy across depth to test if the ecological functions provided by herbivores at shallow reefs can be replenished by deep water populations. Eighty percent of herbivorous species (1967 fishes, 48 species total) were associated with depths < 30 m, where hard coral was the dominant benthos (peak diversity ~ 20 m). Some species were restricted to shallow reef (< 30 m), while others were ubiquitous (4–70 m), or most abundant in deeper reef (30–70 m). Functional diversity and redundancy were highest at < 30 m, almost 2 × higher than for deeper (> 30 m) reef areas. Scraper herbivores were associated with the reef crest (< 10 m), grazers with the reef slope (< 30 m), and browsers were evenly distributed across depth (4–70 m). Impacts to herbivores in shallow reefs (e.g. ocean warming, storms, fishing) may be ameliorated if species are widely distributed across depth, or have the ability to opportunistically relocate to adjacent undisturbed areas. Deeper habitat appears to support a subset of the herbivore community, by providing habitat and resources for the browser functional group (only herbivores capable of ingesting large macroalgae) and species with generalist depth distributions and known trophic flexibility (e.g. genus Scarus). Additional management of depth zones where functional group distributions overlap may maximize chances of sustaining herbivore diversity and functional redundancy, and provide enhanced protection across depth for important fished species such as large parrotfishes and unicornfishes.

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Acknowledgements

The authors acknowledge the crew of the RV Solander, B. Vaughan, M. Stowar, J. Colquhoun, M. Chinkin and M. Birt for data collection, J.H. Choat and M. Abdul-Wahab for discussions, and the financial support of Shell Australia Pty Limited and the INPEX-operated Ichthys LNG Project in conducting this research. On behalf of all authors, the corresponding author states that there is no conflict of interest.

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Authors and Affiliations

  1. Australian Institute of Marine Science, IOMRC, The University of Western Australia, Crawley, WA, 6009, Australia

    Katherine Cure, Ronen Galaiduk, Ben Radford, Mary Wakeford & Andrew Heyward

  2. Australian Institute of Marine Science, PMB 3 Townsville MC, Townsville, QLD, 4810, Australia

    Leanne Currey-Randall

  3. The Oceans Institute, The University of Western Australia, Crawley, WA, 6009, Australia

    Ben Radford & Andrew Heyward

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  1. Katherine Cure
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Correspondence to Katherine Cure.

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Cure, K., Currey-Randall, L., Galaiduk, R. et al. Depth gradients in abundance and functional roles suggest limited depth refuges for herbivorous fishes. Coral Reefs 40, 365–379 (2021). https://doi.org/10.1007/s00338-021-02060-7

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Keywords

  • Mesophotic
  • Climate change
  • Herbivores
  • Functional groups
  • Functional redundancy
  • Depth distribution