scholarly journals Summer shifts of bacterial communities associated with the invasive brown seaweed Sargassum muticum are location and tissue dependent

PLoS ONE ◽  
2018 ◽  
Vol 13 (12) ◽  
pp. e0206734 ◽  
Author(s):  
Alexandra Serebryakova ◽  
Tania Aires ◽  
Frédérique Viard ◽  
Ester A. Serrão ◽  
Aschwin H. Engelen
Keyword(s):  
Bacterial Communities ◽  
Brown Seaweed ◽  
Sargassum Muticum

scholarly journals On the Health Benefits vs. Risks of Seaweeds and Their Constituents: The Curious Case of the Polymer Paradigm

Marine Drugs ◽  
2021 ◽  
Vol 19 (3) ◽  
pp. 164
Author(s):  
João Cotas ◽  
Diana Pacheco ◽  
Glacio Souza Araujo ◽  
Ana Valado ◽  
Alan T. Critchley ◽  
...  
Keyword(s):  
Brown Seaweed ◽  
Dry Weight ◽  
Sargassum Muticum ◽  
Human Nutrition ◽  
Health Impacts ◽  
Gracilaria Gracilis ◽  
Red Seaweeds ◽  
Positive Effects ◽  
Negative Impacts ◽  
Biomedical Potential

To exploit the nutraceutical and biomedical potential of selected seaweed-derived polymers in an economically viable way, it is necessary to analyze and understand their quality and yield fluctuations throughout the seasons. In this study, the seasonal polysaccharide yield and respective quality were evaluated in three selected seaweeds, namely the agarophyte Gracilaria gracilis, the carrageenophyte Calliblepharis jubata (both red seaweeds) and the alginophyte Sargassum muticum (brown seaweed). It was found that the agar synthesis of G. gracilis did not significantly differ with the seasons (27.04% seaweed dry weight (DW)). In contrast, the carrageenan content in C. jubata varied seasonally, being synthesized in higher concentrations during the summer (18.73% DW). Meanwhile, the alginate synthesis of S. muticum exhibited a higher concentration (36.88% DW) during the winter. Therefore, there is a need to assess the threshold at which seaweed-derived polymers may have positive effects or negative impacts on human nutrition. Furthermore, this study highlights the three polymers, along with their known thresholds, at which they can have positive and/or negative health impacts. Such knowledge is key to recognizing the paradigm governing their successful deployment and related beneficial applications in humans.

scholarly journals Enhancing Methane Production from Spring-Harvested Sargassum muticum

2021 ◽  
pp. 117-123
Author(s):  
Supattra Maneein ◽  
John J. Milledge ◽  
Birthe V. Nielsen
Keyword(s):  
Anaerobic Digestion ◽  
Pharmaceutical Industry ◽  
Brown Seaweed ◽  
Sargassum Muticum ◽  
Biofuel Production ◽  
Biochemical Methane Potential ◽  
Seaweed Species ◽  
Invasive Seaweed ◽  
Methane Potential ◽  
Aqueous Meoh

AbstractSargassum muticum is a brown seaweed which is invasive to Europe and currently treated as waste. The use of S. muticum for biofuel production by anaerobic digestion (AD) is limited by low methane (CH4) yields. This study compares the biochemical methane potential (BMP) of S. muticum treated in three different approaches: aqueous methanol (70% MeOH) treated, washed, and untreated. Aqueous MeOH treatment of spring-harvested S. muticum was found to increase CH4 production potential by almost 50% relative to the untreated biomass. The MeOH treatment possibly extracts AD inhibitors which could be high-value compounds for use in the pharmaceutical industry, showing potential for the development of a biorefinery approach; ultimately exploiting this invasive seaweed species.

The resistance to dislodgement ofSargassum muticumgermlings under defined hydrodynamic conditions

1983 ◽  
Vol 63 (1) ◽  
pp. 181-193 ◽  
Author(s):  
Trevor A. Norton
Keyword(s):  
Water Flow ◽  
Brown Seaweed ◽  
Sargassum Muticum ◽  
Flowing Water ◽  
Hydrodynamic Conditions ◽  
Secure Attachment ◽  
Water Motion ◽  
The Mean ◽  
Flow Velocities

The attachment capabilities of a brown seaweed,Sargassum muticum(Yendo) Fensholt were investigated in the laboratory on both smooth and rough substrata and in surging water motion reaching flow velocities of 57 cm s and 90 cm s.Newly released zygotes have no means of adhesion until they develop rhizoids, which can adhere on contact with the substratum. Attachment tenacity, as measured by the germling's ability to withstand dislodgement at a given velocity of water flow, is slight at first, but increases with time. This is not simply a function of time spent in residence on the substratum, for germlings cultured suspension stick very quickly and tenaciously when allowed to settle. Tenacity of adhesion seems to be a reflexion of the amount of mucopolysaccharide adhesive present. This increases gradually during the first few days of the germling's life, regardless of whether it is attached or not.Once secure attachment is achieved it is not weakened even by the death of the germling. A film of bacteria and micro algae on the surface of the substratum is not a requirement for germling adhesion, but its presence enhances the tenacity of adhesion.Smooth substrata are the least favourable for germling survival in flowing water. On rough substrata the ‘peaks’ of the microtopography and surfaces facing into the current are much less favourable than the troughs between the ‘peaks’, or surfaces in the lee of ‘peaks’. Germling survival increases with increasing substratum roughness up to an optimum rugosity at which the mean depth of the depressions on the surface is 420 μm, and the vast majority are deeper than the height of the germlings.

Mesograzers prefer mostly native seaweeds over the invasive brown seaweed Sargassum muticum

Hydrobiologia ◽  
2011 ◽  
Vol 669 (1) ◽  
pp. 157-165 ◽  
Author(s):  
Aschwin H. Engelen ◽  
Nuno Henriques ◽  
Carla Monteiro ◽  
Rui Santos
Keyword(s):  
Brown Seaweed ◽  
Sargassum Muticum

scholarly journals Diversity of bacteria populations associated with different thallus regions of the brown alga Laminaria digitata

PLoS ONE ◽  
2020 ◽  
Vol 15 (11) ◽  
pp. e0242675
Author(s):  
Maureen W. Ihua ◽  
Jamie A. FitzGerald ◽  
Freddy Guihéneuf ◽  
Stephen A. Jackson ◽  
Marcus J. Claesson ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Bacterial Population ◽  
Cold Water ◽  
Brown Seaweed ◽  
16S Rrna Genes ◽  
Rrna Genes ◽  
Rocky Shores ◽  
Biotechnological Applications ◽  
Laminaria Digitata ◽  
Coastal Systems

Stipitate kelp species such as Laminaria digitata dominate most cold-water subtidal rocky shores and form underwater forests which are among the most productive coastal systems worldwide. Laminaria also sustains rich bacterial communities which offer a variety of biotechnological applications. However, to date, in-depth studies on the diversity and uniqueness of bacterial communities associated with this macroalgal species, their ecological role and their interactions with the alga are under-represented. To address this, the epibacterial populations associated with different thallus regions (holdfast, stipe, meristem, blade) of this brown seaweed were investigated using high-throughput Illumina sequencing of the 16S rRNA genes. The results show that epibacterial communities of the brown seaweed are significantly different and specific to the thallus region, with the shared bacterial population comprising of only 1.1% of the total amplicon sequence variants. The diverse holdfast and blade tissues formed distinct clusters while the meristem and stipe regions are more closely related. The data obtained further supports the hypothesis that macroalgal bacterial communities are shaped by morphological niches and display specificity.

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