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Updated: Feb 15, 2026

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Patterns in reef fish assemblages: Insights from the Chagos Archipelago.

Melita Samoilys1,2, Ronan Roche3, Heather Koldewey4,5

  • 1CORDIO East Africa, Mombasa, Kenya.

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|January 20, 2018
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Summary

Fish assemblages in the Chagos Archipelago show high variability, linked to coral cover and rugosity. Key herbivorous fish species significantly influence these patterns, highlighting bottom-up control in reef ecosystems.

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Area of Science:

  • Marine Ecology
  • Coral Reef Ecology
  • Ichthyology

Background:

  • Coral reef fish assemblages are vital for ecosystem resilience.
  • Herbivorous fish are key to maintaining coral-dominated states.
  • Understanding fish-benthos interactions is complicated by natural and anthropogenic factors.

Purpose of the Study:

  • To investigate fish assemblages and benthic variables in the Chagos Archipelago, a low-fishing-pressure environment.
  • To understand the drivers of variability in fish composition and their relationship with benthic structure.

Main Methods:

  • Studied fish assemblages and benthic variables across five atolls in the Chagos Archipelago.
  • Analyzed associations between fish group densities and coral cover, recently dead coral, and rugosity.
  • Conducted species-level analyses to identify key driver species.

Main Results:

  • High variability in fish assemblages was observed across atolls and sites.
  • Grazer-detritivore surgeonfish and parrotfish densities varied significantly (over 40-fold).
  • Fish assemblage differences were strongly associated with live/dead coral cover and rugosity, suggesting bottom-up control.

Conclusions:

  • Coral recovery trajectories post-bleaching and bottom-up control influence fish assemblages.
  • Species like Scarus niger, Acanthurus nigrofuscus, and Chlorurus strongylocephalos are key drivers of assemblage structure.
  • Further species-level studies on feeding behavior are needed to understand the role of herbivorous fish in reef resilience.