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Updated: Dec 7, 2025

Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities

Coral Reef Arks: An In Situ Mesocosm and Toolkit for Assembling Reef Communities

Published on: January 6, 2023

A connectivity portfolio effect stabilizes marine reserve performance.

Hugo B Harrison^1,2, Michael Bode³, David H Williamson^4,5

¹Australian Research Council Centre of Excellence for Coral Reef Studies, James Cook University, Townsville, QLD 4814, Australia; hugo.harrison@jcu.edu.au.

Proceedings of the National Academy of Sciences of the United States of America

|September 29, 2020

Summary

Marine reserves provide larval subsidies for sustainable fisheries. A network of reserves stabilizes fish populations by averaging out variable larval dispersal, ensuring consistent replenishment for exploited fish stocks.

Keywords:

connectivity larval dispersal marine reserve marine spatial planning portfolio effects

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Area of Science:

Marine Ecology
Fisheries Science
Conservation Biology

Background:

No-take marine reserves are crucial for sustaining fisheries by providing larval subsidies.
Variability in larval dispersal from single reserves causes fluctuations in fish population replenishment.
Mitigating larval supply uncertainty is key to stable recruitment and fishery catches.

Purpose of the Study:

To investigate larval dispersal patterns and recruitment contributions of marine reserves.
To assess the impact of multiple, asynchronous marine reserves on recruitment stability.
To evaluate the effectiveness of marine reserve networks in mitigating temporal fluctuations in larval supply.

Main Methods:

Utilized genetic parentage analysis to track larval dispersal and recruitment.
Examined four marine reserves across six recruitment cohorts for coral grouper (Plectropomus maculatus).
Analyzed the 'connectivity portfolio effect' from asynchronous reserve contributions.

Main Results:

Observed extreme variability in dispersal patterns and recruitment from individual marine reserves.
Demonstrated that asynchronous contributions from multiple reserves create temporal stability in recruitment.
Showed that a network of reserves reduced larval supply variability by a factor of 1.8, halving uncertainty.

Conclusions:

Networks of marine reserves provide significant stabilizing benefits for larval supply.
Small networks can ensure consistent replenishment of exploited fish stocks.
The 'connectivity portfolio effect' enhances the long-term sustainability of fisheries through marine reserve networks.