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Updated: May 4, 2026

Field Collection and Laboratory Maintenance of Canopy-Forming Giant Kelp to Facilitate Restoration
Published on: June 7, 2024
Towards restoration of missing underwater forests
Alexandra H Campbell1, Ezequiel M Marzinelli1, Adriana Vergés1
1Sydney Institute of Marine Sciences, Mosman, NSW, Australia ; Centre for Marine Bio-Innovation and School of Biological, Earth and Environmental Sciences, University of New South Wales, Sydney, NSW, Australia ; Evolution and Ecology Research Centre, University of New South Wales, Sydney, NSW, Australia.
Restoring kelp forests like Phyllospora comosa in urban Sydney is possible, as transplanted algae survived and recruited well. However, factors like herbivory and low propagule supply may hinder natural recovery of these vital coastal habitats.
Area of Science:
- Marine ecology
- Restoration ecology
- Coastal habitat dynamics
Background:
- Urbanization drives habitat degradation and biodiversity loss, shifting ecosystems to less diverse states.
- Macroalgae are crucial habitat-forming species in temperate coastal ecosystems.
- Phyllospora comosa, a key habitat-forming alga in SE Australia, has vanished from Sydney's urban shores, despite water quality improvements.
Purpose of the Study:
- To experimentally assess the suitability of urban Sydney reefs for Phyllospora comosa survival and recruitment.
- To evaluate the potential for restoring Phyllospora comosa to its historically abundant coastal habitats.
Main Methods:
- Transplantation of adult Phyllospora comosa to two rocky reef sites in Sydney.
- Monitoring of survival, reproduction, and recruitment rates of transplanted algae.
- Comparison of survival rates with undisturbed algae and procedural controls, considering herbivory impacts.
Main Results:
- High overall survival of transplanted Phyllospora comosa, with spatial variability linked to herbivory.
- Successful reproduction and significantly higher recruitment rates at one experimental site.
- New recruits exhibited high survival for nearly 18 months, indicating potential for successful re-establishment.
Conclusions:
- Sydney's urban reefs may now be suitable for Phyllospora comosa re-establishment.
- Low propagule supply, settlement success, and herbivory are potential barriers to natural recovery.
- Understanding ecological processes is crucial for setting realistic restoration goals and ensuring the success of kelp forest restoration.
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