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Measuring the Structure, Composition, and Change of Underwater Environments with Large-area Imaging

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Published on: April 18, 2025

Allometric growth in reef-building corals.

Maria Dornelas¹, Joshua S Madin², Andrew H Baird³

¹Centre for Biological Diversity, Scottish Oceans Institute, University of St Andrews, St Andrews KY16 9TH, UK maadd@st-andrews.ac.uk.

Proceedings. Biological Sciences

|March 24, 2017

Summary

Coral growth rates are predictable from colony size and morphology, not species. This finding aids in forecasting ecosystem changes due to global warming and disturbances.

Keywords:

Scleractinia allometry morphology scaling traits

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Area of Science:

Ecology
Marine Biology
Conservation Science

Background:

Predicting demographic rates is crucial for understanding ecosystem futures under global change.
Scleractinian corals, as colonial symbiotic organisms, are key components of marine ecosystems.

Purpose of the Study:

To determine if coral growth rates can be predicted using morphological traits.
To investigate allometric scaling in coral growth and identify sources of variation (species vs. morphology).

Main Methods:

Growth was estimated as the change in planar area over 5 years.
Data were collected for 11 scleractinian coral species across five morphological groups.
Statistical analysis was used to compare the predictive power of size, morphology, and species on growth rates.

Main Results:

Coral growth rates were best predicted by colony size and morphology, outperforming species-level predictions.
Coral size exhibited power-law scaling with a consistent exponent of 0.91.
Consistent allometric scaling was observed across different coral species and morphological groups.

Conclusions:

Coral growth is primarily influenced by size and morphology, simplifying future ecological projections.
This predictability is vital for forecasting community responses to environmental disturbances and climate change impacts.
Understanding allometric scaling in coral growth enhances our ability to model and conserve reef ecosystems.