Analyzing environmental factors that favor the growth of the invasive brown macroalga Rugulopteryx okamurae (Ochrophyta): The probable role of the nutrient excess

Mercado, Jesús M.; Gómez-Jakobsen, Francisco; Korbee, Nathalie; Avilés, Antonio; Bonomi-Barufi, José; Muñoz, M.; Reul, Andreas; Figueroa, Félix L.

doi:10.1016/j.marpolbul.2021.113315

Cited by 23 publications

(6 citation statements)

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“…Mercado et al (2022) reported a highly variable N content in R. okamurae ranging from 1.4% to 4.5%, suggesting that this species has high N storage capacity that is potentially usable when the external N concentration decreases [ 22 ]. This storage capacity of N is a common feature of bloom-forming algae, which allows them an opportunistic growth when the external conditions are favorable.…”

Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Hydrothermal Processing of Rugulopteryx okamurae

et al. 2023

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One possible scheme of Rugulopteryx okamurae biomass valorization based on a green, rapid and efficient fractionation technique was proposed. Microwave-assisted pressurized hot water extraction was the technology selected as the initial stage for the solubilization of different seaweed components. Operation at 180 °C for 10 min with a 30 liquid-to-solid ratio solubilized more than 40% of the initial material. Both the alginate recovery yield (3.2%) and the phenolic content of the water-soluble extracts (2.3%) were slightly higher when distilled water was used as solvent. However, the carbohydrate content in the extract (60%) was similar for both solvents, but the sulfate content was higher for samples processed with salt water collected from the same coast as the seaweeds. The antiradical capacity of the extracts was related to the phenolic content in the extracts, but the cytotoxicity towards HeLa229 cancer cells was highest (EC50 = 48 µg/mL) for the extract obtained with distilled water at the lowest temperature evaluated. Operation time showed a relevant enhancement of the extraction performance and bioactive properties of the soluble extracts. The further fractionation and study of this extract would be recommended to extend its potential applications. However, due to the low extraction yield, emphasis was given to the solid residue, which showed a heating value in the range 16,102–18,413 kJ/kg and could be useful for the preparation of biomaterials according to its rheological properties.

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Section: Resultsmentioning

confidence: 99%

Microwave-Assisted Hydrothermal Processing of Rugulopteryx okamurae

et al. 2023

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“…Recently, the drastic colonization of R. okamurae in the Strait of Gibraltar has been related to the increase in temperature and nutrients in the water column [ 28 , 183 ]. Just in the last four years, millions of tonnes per year of R. okamurae biomass have been collected on the Andalusian coast as beach-cast algae.…”

Section: Discussionmentioning

confidence: 99%

Molecular Diversity and Biochemical Content in Two Invasive Alien Species: Looking for Chemical Similarities and Bioactivities

et al. 2022

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The biochemical composition, molecular diversity, and two different bioactivities of Asparagopsis armata and Rugulopteryx okamurae (two alien species with different invasive patterns in the southern Iberian Peninsula) were analyzed through spectrophotometric methods and Fourier transform ion cyclotron mass spectroscopy (FT-ICR-MS). A total of 3042 molecular formulas were identified from the different extracts. The dH2O extracts were the most molecularly different. A. armata presented the highest content of nitrogenous compounds (proteins, CHON) and sulphur content, whereas R. okamurae was rich in carbonated compounds (total carbon, lipids, CHO, and CHOP). Antioxidant capacity and phenolic content were higher in R. okamurae than in A. armata. Antimicrobial activity was detected from both species. A. armata showed capacity to inhibit human and fish pathogens (e.g., Staphylococcus aureus or Vibrio anguillarum), whereas R. okamurae only showed inhibition against human bacteria (Staphylococcus aureus and Cutibacterium acnes). In R. okamurae, molecules with a great number of pharmaceutical activities (e.g., anti-inflammatory or antitumoral), antibacterial, biomaterial, and other utilities were found. The main molecules of A. armata had also pharmaceutical applications (e.g., antimalarian, antithrombotic, anti-inflammatory, or antiarthritis). The valorization of these species can help to counteract the environmental effects of the bioinvasions.

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“…In its native habitat, R. okamurae is present around the year and its maximal growth rate is reached in spring and summer when the highest temperature is reached (22.4 °C). Mercado et al (2022) compared the minimum SST for the Strait of Gibraltar with the native habitats of R. okamurae, to conclude that higher winter temperatures could explain the invader success of this species. Lee and Kang (2020) tested the effect of increasing temperature on the growth of Ulva linza, showing a positive effect of increased temperature when in combination with high nutrient concentration.…”

Section: Figurementioning

confidence: 99%

Monitoring invasive macroalgae in southern Portugal: drivers and citizen science contribution

Herrero,

Simes,

Abecasis

et al. 2023

Front. Environ. Sci.

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Under certain environmental and oceanographic conditions, macroalgae can overgrow and accumulate in massive quantities on beaches, causing serious ecological and economic impacts. To address this problem, a citizen science monitoring platform was created to determine the spatial and temporal distribution of macroalgae accumulations along the beaches of Algarve in southern Portugal, with the aim to assess the extent of beach-cast events and their relationship with abiotic factors. A Redundancy Analysis (RDA) and a permutational analysis of variance (PERMANOVA) were carried out to explore the relationship between macroalgae accumulation level and the abiotic variables: sea surface temperature, wind speed, wind direction, currents, maximum sea level, significant wave height, salinity, nitrate, ammonium, phosphate, precipitation and radiation. The citizen science campaign showed great participation, resulting in 404 submissions between July 2021 and September 2023. The campaign revealed that three species of macroalgae accumulated on the beaches of Algarve, Ulva sp. (with the presence of Ectocarpales and Dyctiotales) along the sandy eastern coast, and the invasive species Asparagopsis armata and Rugulopteryx okamurae in the rocky central and western beaches, respectively. The accumulations of R. okamurae increased from 2021 to 2023, were registered throughout the year and were more abundant than those of Ulva sp. and A. armata, which were only observed in spring and summer. The highest levels of R. okamurae beach-cast depositions were related to strong wave conditions, and high sea surface temperature and salinity. The accumulation of Ulva sp. was related to high sea surface temperature and salinity whereas A. armata was also correlated with winds parallel to the shore (NW-W). PERMANOVA analysis revealed that sea surface temperature and wave conditions had a significant effect on the overall abundance of macroalgae beach-cast accumulations. Overall, our citizen science campaign effectively involved the public, leading to the collection of important data on monitoring macroalgae accumulations. Through these findings, we were able to pinpoint the environmental, atmospheric, and hydrodynamic factors that contribute to their development, movement, and buildup along the Algarve coastlines.

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Analyzing environmental factors that favor the growth of the invasive brown macroalga Rugulopteryx okamurae (Ochrophyta): The probable role of the nutrient excess

Cited by 23 publications

References 64 publications

Microwave-Assisted Hydrothermal Processing of Rugulopteryx okamurae

Microwave-Assisted Hydrothermal Processing of Rugulopteryx okamurae

Molecular Diversity and Biochemical Content in Two Invasive Alien Species: Looking for Chemical Similarities and Bioactivities

Monitoring invasive macroalgae in southern Portugal: drivers and citizen science contribution

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