Biophysical models resolution affects coral connectivity estimates

Area of Science:

• Marine Ecology
• Conservation Science
• Computational Modeling

Background:

• Estimating coral reef connectivity is vital for conservation and restoration efforts.
• Biophysical models are used to simulate connectivity, but their spatial resolution is often coarser than the reef scale.

Purpose of the Study:

• To assess the impact of biophysical model resolution on coral reef connectivity estimates.
• To compare connectivity outputs from models with resolutions ranging from 250 m to 4 km.

Main Methods:

• Utilized five different setups of the same biophysical model with varying spatial resolutions (250 m to 4 km).
• Analyzed changes in dispersal patterns, connectivity graph structure, community structure, and larval retention with increasing resolution.

Main Results:

• Finer model resolutions (e.g., around 250 m) produce more complex, less directional dispersal patterns.
• Increased resolution leads to more numerous but weaker connections, larger clusters of well-connected reefs, and enhanced local retention/self-recruitment.
• Connectivity estimates differ significantly, with only about half of the top reefs showing similarity between the finest and coarsest resolutions.

Conclusions:

• Model resolution critically influences coral reef connectivity estimations.
• Reef management recommendations should consider the scale of the model resolution used.
• Reef-scale management requires models with resolutions not exceeding approximately 500 m.