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Optimizing the initial cultivation stages of kelp Ecklonia radiata for restoration

Citation

Suebsanguan, S and Strain, EMA and Morris, RL and Swearer, SE, Optimizing the initial cultivation stages of kelp Ecklonia radiata for restoration, Restoration Ecology, 29, (5) Article e13388. ISSN 1061-2971 (2021) [Refereed Article]

Copyright Statement

Copyright 2021 Society for Ecological Restoration

DOI: doi:10.1111/rec.13388

Abstract

Restoration of kelp forests typically relies on transplanting sporophylls to new locations and has limited application in regions with low remnant kelp cover. Cultivated kelp requires fewer sporophylls and is a potential alternative and sustainable source of transplants for large‐scale restoration projects. Naturally sourced fertile sporophylls, however, are still required as ‘seed’ stock in cultivation practices, thus optimizing cultivation methods is important to minimize this dependency on wild stocks. To assist in optimizing the early‐stage cultivation methods for restoring beds of the laminarian kelp Ecklonia radiata, we first tested the effects of sporophyll transport, storage, and dehydration on zoospore release. We then tested for effects of inoculum storage temperature on zoospore abundance, and lastly for media sterilization and inoculum concentration effects on both zoospore settlement and resulting gametophyte densities. Our results show, to maximize zoospore release, sporophylls should be transported dry and inoculated within three hours. Inoculum can be stored at 4°C without affecting zoospore abundance and should be added to sterilized media at lower concentrations to reduce settled zoospore density and improve post‐settlement survival of the gametophyte stage. This study provides practical recommendations for optimizing the initial cultivation procedures of E. radiata. To develop a full life‐cycle cultivation protocol for kelp restoration purposes, future research should focus on optimizing sporophyte production, out‐planting and transplanting techniques.

Item Details

Item Type:Refereed Article
Keywords:kelp, restoration, aquaculture, canopy-forming, dehydration, inoculation, kelp culture, macroalgae, zoospores
Research Division:Environmental Sciences
Research Group:Environmental management
Research Field:Environmental rehabilitation and restoration
Objective Division:Environmental Management
Objective Group:Coastal and estuarine systems and management
Objective Field:Assessment and management of coastal and estuarine ecosystems
UTAS Author:Strain, EMA (Dr Beth Strain)
ID Code:143511
Year Published:2021
Deposited By:Sustainable Marine Research Collaboration
Deposited On:2021-03-22
Last Modified:2021-10-11
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