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Updated: Oct 29, 2025
07:59
Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities
Published on: January 6, 2023
3.8K
Space-filling and benthic competition on coral reefs.
Emma E George1,2, James A Mullinix3,4,5, Fanwei Meng3
1Department of Biology, San Diego State University, San Diego, CA, United States of America.
Peerj
|July 12, 2021
Summary
Coral geometry influences competition. Larger, more complex coral surfaces and smaller perimeters enhance competitive success against other reef organisms, optimizing energy gain and defense.
Area of Science:
- Marine Biology
- Ecology
- Geometric Morphometrics
Background:
- Reef-building corals are crucial ecosystem engineers.
- Corals compete for space and resources, utilizing surface area for energy acquisition (photosynthesis, heterotrophy) and perimeter defense.
- Energy is allocated to defend colony perimeters against competitors.
Purpose of the Study:
- To test the hypothesis that coral geometry (surface area, perimeter) influences competitive outcomes.
- To investigate the association between coral surface space-filling dimensions and perimeter length with competitive success.
Main Methods:
- Digital 3D and 2D reconstructions of 50 Caribbean coral colonies.
- Analysis of geometric properties: surface area, perimeter, and box-counting dimensions (space-filling).
- Correlation of geometric properties with observed competitive outcomes (tissue growth vs. damage).
Main Results:
- Increased surface space-filling dimension (Ds) was a significant predictor of coral winning outcomes.
- The combination of surface space-filling dimension and perimeter length improved statistical prediction of competition.
- Corals with higher surface space-filling dimensions and smaller perimeters showed more competitive wins.
Conclusions:
- Coral surface geometry, specifically space-filling properties and perimeter length, is a key factor in competitive success.
- Integrating geometric traits with life history traits can enhance quantitative characterization of coral competition.
- This geometric framework is applicable to other complex-surfaced organisms and ecosystems.
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