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Coral reef ecosystems are shifting. This study identified five distinct reef regimes by analyzing fish and benthic communities, revealing complex dynamics and spatial variations crucial for effective coral reef management.

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Area of Science:

  • Marine Ecology
  • Ecosystem Dynamics
  • Conservation Biology

Background:

  • Coral reefs face global decline, often shifting from coral to macroalgal dominance.
  • Understanding spatial and temporal variations in reef ecosystems is critical due to their complexity.
  • Existing characterizations of reef regimes primarily focus on benthic components, neglecting fish assemblages.

Purpose of the Study:

  • To define and differentiate reef regimes by integrating both fish and benthic assemblages.
  • To investigate the spatial heterogeneity and temporal dynamics of these integrated reef regimes.
  • To provide a more comprehensive framework for monitoring coral reef health and informing management strategies.

Main Methods:

  • Synthesized data from 3,345 surveys conducted across Hawaiian reefs.
  • Employed model-based clustering to identify distinct ecological regimes based on fish and benthic data.
  • Analyzed time series data to understand regime transitions and their drivers.

Main Results:

  • Identified five distinct reef regimes with significant ecological and spatial variations across islands, depths, and exposure levels.
  • Characterized a degraded regime (low coral, low fish biomass) and a distinct low-coral, high-fish biomass regime.
  • Revealed that previously defined 'coral-dominated' regimes are ecologically diverse, encompassing three distinct states.
  • Observed complex system dynamics with multiple regime transitions influenced by local and global stressors.

Conclusions:

  • Coupling fish and benthic community data into reef regimes offers a more holistic approach to understanding ecosystem complexity.
  • The identified regimes and their dynamics provide valuable insights for monitoring changes in coral reef ecosystems.
  • This integrated approach supports the development of effective ecosystem-based management strategies for coral reefs worldwide.