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Updated: May 5, 2026

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Benthic habitat structure explains broad-scale patterns in reef fish communities.

Mollie Asbury1, Nina Schiettekatte1, Tye L Kindinger2

  • 1Hawai'i Institute of Marine Biology, University of Hawai'i at Mānoa, Kāne'ohe, Hawai'i, USA.

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Summary
This summary is machine-generated.

Habitat structure, particularly rugosity, is the main driver of coral reef fish communities, influencing biomass and species richness. Maintaining complex reef habitats is essential for ecosystem function and resilience.

Keywords:
anthropogenic factorsbehavioral traitscommunity structurecoral reef fishesenvironmental driversfractal dimensionreef structural complexityrugosity

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Area of Science:

  • Marine Ecology
  • Coral Reef Ecology
  • Fisheries Science

Background:

  • Coral reef fish communities provide key ecosystem functions and services.
  • Habitat complexity is crucial for reef fish, but often oversimplified in analyses.
  • Understanding drivers of fish community structure is vital in changing marine systems.

Purpose of the Study:

  • To assess the role of 3D habitat structure in fish community structure compared to environmental and anthropogenic drivers.
  • To investigate how habitat features influence fish biomass, species richness, abundance, and community composition.
  • To determine the impact of degraded reef conditions on ecosystem functions.

Main Methods:

  • Utilized 3D habitat data and fish census data from 89 sites in the Hawaiian Archipelago.
  • Quantified habitat structure (rugosity, fractal dimension, coral cover).
  • Assessed environmental (depth, temperature, chlorophyll a, wave exposure) and anthropogenic (sedimentation, pollution, development, tourism, fishing) factors.

Main Results:

  • Habitat rugosity was the dominant driver for all community descriptors, followed by environmental variables.
  • Fish community composition, based on behavioral traits, was strongly shaped by habitat structure.
  • Degraded reefs with reduced rugosity and coral cover supported communities with lower biomass and fewer traits.

Conclusions:

  • Habitat structure, alongside environmental conditions, filters fish community traits and influences ecological organization.
  • Maintaining reef structural complexity is crucial for supporting functional diversity and ecosystem services.
  • Management actions targeting habitat structure can cascade through fish communities, impacting ecosystem functions.