A Concise Review on the Potential Applications of Rugulopteryx okamurae Macroalgae

Barcellos, Ligia; Pham, Christopher K.; Menezes, Gui; Bettencourt, Raúl; Rocha, Nieta; Carvalho, Miguel; Felgueiras, Helena P.

doi:10.3390/md21010040

Cited by 14 publications

(8 citation statements)

References 47 publications

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“…The use of anti‐fouling materials (Fernandes et al, 2016) and the appropriate cleaning of the hull in dry‐dock with water treatment or by underwater technology that eliminates the fouling organisms, such as techniques using laser or ultrasound (Song & Cui, 2020), should also be required as part of renewable operating licenses, including recreational boating. Likewise, changes in and enforcement of legislation concerning the transportation of live organisms for feed, aquarium trade and management of aquaculture waste are also a concern (Barcellos et al, 2023; Lehtiniemi et al, 2015). Geographic areas with a higher risk of invasion need to be identified with environmental models based on changes in both climate and uses of the maritime space over time, driven by climate factors and new technology developments (Sánchez‐Velásquez et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Control and eradication measures for marine macroalgal invasive species are mainly based on manual removal of vegetative (Barcellos et al, 2023) or reproductive thalli (Zanolla et al, 2018). Additionally, hyaline shock, smothering with sand or tarp cover, and herbicides such as copper sulphide or chlorine have been used with different levels of success to eliminate algal populations in stages of development, namely on large infested areas, large isolated patches and dispersed small patches (Cardigos et al, 2015).…”

Section: Management Considerationsmentioning

confidence: 99%

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Quantification of the invasiveness risk of non‐native macroalgae in the Azores to support conservation measures

Gabriel,

Martins,

Ribeiro

et al. 2024

Aquatic Conservation

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Non‐native species (NNS) might become invasive and threaten biodiversity, economy and public health. Therefore, it is essential that their invasiveness risk be quantified to support conservation measures. The Azores, located in the mid‐northern Atlantic, is the crossroad of macroalgal native distributions and also present almost three times the global ratio of macroalgae reported as NNS. Aquatic Species Invasiveness Screening Kit, a decision‐support tool consisting of 49 questions for the Basic Risk Assessment (BRA) and six for the Climate Change Assessment (CCA), was applied to the 42 marine macroalgae classified as NNS in the Azores. The results indicate that 21 species pose a medium risk of becoming invasive, and 15 present a high risk under current climate conditions (BRA scores only). The combined BRA + CCA scores show that Laurencia dendroidea poses a high risk instead of a medium risk. Thirty‐three Rhodophyta species were screened, with 10 (BRA) and 11 (BRA + CCA) classified as high risk. All four Chlorophyta species ranked as high risk. Only one of the five Ochrophyta species was classified as high risk, namely Rugulopteryx okamurae, one of the most invasive species in European waters. High‐risk species are present in all islands, likely spread by the continuous maritime traffic between islands. Six of the high‐risk species are restricted to single islands (BRA and BRA + CCA scores), and efforts should be made to contain their further expansion. Asparagopsis armata, a species introduced in Europe in the 1920s, is the only high‐risk species present in all islands. Conservation measures for prevention, monitoring and control of NNS are proposed for the different islands of the Azores, including regulation of introduction pathways, prospection of areas with high risk of invasion, risk screening, eradication and containment of NNS. The involvement of stakeholders and maritime workers is also recommended.

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Section: Discussionmentioning

confidence: 99%

Section: Management Considerationsmentioning

confidence: 99%

Quantification of the invasiveness risk of non‐native macroalgae in the Azores to support conservation measures

Gabriel,

Martins,

Ribeiro

et al. 2024

Aquatic Conservation

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“…Recently, a phytochemical study identified the compound dilkamural, which may be responsible for the deterrence and toxic effect of macroalgae against herbivores [37]. On the other hand, R. okamurae is highly toxic due to its high concentration of sesquiterpenes, which are not present in other algae [38]. Likewise, the high terpene content of these algae, which constitutes the largest fraction of their volatile organic compound (VOC) content, makes their degradation difficult [39].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Mixtures of Rugulopteryx okamurae Compost and Plant Residues to Determine the Most Effective Composition as a Substrate and Source of Nutrients

Correa-Bustos,

Berti,

Salas-Sanjuán

et al. 2024

Horticulturae

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The increasing invasion of Rugulopteryx okamurae algae along the coast of southeastern Spain has prompted efforts to explore its potential as a resource. Consequently, composting this alga is considered a viable solution for agricultural applications. This study investigates the composting process of mixtures of R. okamurae seaweed with plant residues and characterizes the final compost for its use as a substrate and/or source of nutrients to determine the most effective composition of the mixture. The composting process was conducted using varying proportions of seaweed (100%, 30–35%, and 15%) combined with plant residues (from vegetable plants, fruits, and gardens) and included both washed and unwashed seaweed. The first trials revealed challenges associated with Rugulopteryx okamurae, such as a low C/N ratio and algae washing. Consequently, a second trial was conducted to optimize the mixtures, aiming for a C/N ratio close to 30. Additionally, it was decided not to wash the algae to reduce the electrical conductivity (EC) in the mixtures. The findings indicate that the composting process remains unaffected by high electrical conductivity when algae are unwashed. However, washing the algae before composting did affect the compost quality, as the composts with washed algae with garden waste (SwP 34.0 dS m−1) had a lower electrical conductivity (EC) than did the unwashed composts with garden waste (SP 51.6 dS m−1 and SFP 64.9 dS m−1). On the other hand, the compost-only horticultural and garden waste (FHP 43.7 dS m−1) had a high EC; therefore, the EC was not increased with low proportions of unwashed algae, as was seen with the compost with 15% unwashed algae (SFHP 47.6 dS m−1). The other quality parameters were not affected by the absence of algae washing at the beginning of the composting process.

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“…Tons of R. okamurae algal biomass are collected every year from the Spanish Mediterranean coastline [3], resulting in high costs for municipalities and several environmental problems [4,5]. In addition to the importance of mapping and controlling the expansion of the invasive seaweeds, to alleviate the economic costs derived from their recollection and disposal, the analysis of the potential applications of algae is a useful approach [2,6]. With this purpose, different authors have evaluated the use of the algae R. okamurae for the generation of biogas [7], as an ingredient of aquafeeds for fish farms [8], as a raw material for the development of bioplastics [9], or in composting processes [2].…”

Section: Introductionmentioning

confidence: 99%

Use of Compost Based on Invasive Algae Rugulopteryx okamurae as a Peat Alternative in Nursery Growing Media

et al. 2023

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The invasion of the macroalgae Rugulopteryx okamurae is causing several environmental and economic problems along Spanish Mediterranean coasts. The use of composts based on R. okamurae as a peat alternative in nursery production could be a valid alternative for the exploitation of this organic material. The present study evaluated three different composts as peat substitutes in potting media to grow tomato seedlings: compost of R. okamurae, compost of green horticultural residues (two-thirds) and R. okamurae (one-third), compost of garden pruning residues (two-thirds) and R. okamurae (one-third). Each compost was used to formulate two different substrates to reduce the use of peat (40% compost, 40% peat, 20% perlite) or entirely substitute it (80% compost, 20% perlite), using a control treatment with 80% peat and 20% perlite. Only the control treatment received mineral fertigation during the trial. The results showed that the high initial electrical conductivity and ion concentration were remarkably reduced thanks to the fast leaching of salt that occurred with customary irrigation. Generally, compost-based treatments allowed us to obtain tomato seedlings with satisfactory morphological parameters. The substrates that contained 40% compost of R. okamurae or a compost of garden pruning residues and R. okamurae led to the best results in term of seedling parameters. It is therefore concluded that composts based on R. okamuare could be used as a seedling growing medium for the valorization of algae.

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A Concise Review on the Potential Applications of Rugulopteryx okamurae Macroalgae

Cited by 14 publications

References 47 publications

Quantification of the invasiveness risk of non‐native macroalgae in the Azores to support conservation measures

Quantification of the invasiveness risk of non‐native macroalgae in the Azores to support conservation measures

Characterization of Mixtures of Rugulopteryx okamurae Compost and Plant Residues to Determine the Most Effective Composition as a Substrate and Source of Nutrients

Use of Compost Based on Invasive Algae Rugulopteryx okamurae as a Peat Alternative in Nursery Growing Media

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