scholarly journals Structure and dynamics of epifaunal assemblages on intertidal macroalgae Ascophyllum nodosum and Fucus vesiculosus in Nova Scotia, Canada

1987 ◽  
Vol 37 ◽  
pp. 209-227 ◽  
Author(s):  
SC Johnson ◽  
RE Scheibling
Keyword(s):  
Nova Scotia ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Structure And Dynamics ◽  
Epifaunal Assemblages

Artificial hybridization between Ascophyllum nodosum and Fucus vesiculosus (Phaeophyceae) from Nova Scotia, Canada

1997 ◽  
Vol 75 (7) ◽  
pp. 1133-1136 ◽  
Author(s):  
Kwang Young Kim ◽  
Stephen J. O'Leary ◽  
David J. Garbary
Keyword(s):  
Nova Scotia ◽  
Key Words ◽  
Nuclear Dna ◽  
Parental Species ◽  
Low Frequency ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Male And Female ◽  
Zygote Development ◽  
Maximum Development

Reciprocal crosses between male and female gametes of Ascophyllum nodosum (L.) LeJolis and Fucus vesiculosus L. were made from plants collected at Tor Bay, Nova Scotia. Crosses within each species were viable and resulted in normal zygote development. Hybrids occurred in low frequency in the cultures (ca. 1–5%) and developed either an initial rhizoid or underwent one or two internal divisions. Hybrid zygotes did not develop further. More developing embryos were observed in crosses when F. vesiculosus provided the eggs, and these zygotes developed longer rhizoids. Maximum development was to three or four cells, which occurred in ca. 10 days. By 5 weeks, all zygotes had disintegrated. Nuclear diameter was the same in both species (6 μm) although almost twice as much nuclear DNA was present in A. nodosum than in F. vesiculosus. Nuclei in hybrids were larger than in the parental species. Key words: Ascophyllum nodosum, Fucus vesiculosus, Fucales, hybridization, Phaeophyta.

A SURVEY OF CERTAIN SEAWEEDS OF COMMERCIAL IMPORTANCE IN SOUTHWEST NOVA SCOTIA

1952 ◽  
Vol 30 (1) ◽  
pp. 78-97 ◽  
Author(s):  
Constance MacFarlane
Keyword(s):  
Nova Scotia ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Average Density ◽  
Algal Cover ◽  
Commercial Importance ◽  
Quantitative Measurements ◽  
Biological Studies ◽  
Concrete Blocks ◽  
First Time

The Nova Scotia Research Foundation is making an extensive survey of seaweeds of the Province that are of potential commercial importance. The area in which the survey has been completed extends from Cape Sable Island, Shelburne County to Chebogue, Yarmouth County, and includes also a small part of Digby County. The survey includes both quantitative measurements and biological studies of fucoids, Laminaria spp., and Chondrus, in all of which the region abounds. Of 325 miles of coastline surveyed for rockweed, 140 miles are harvestable, bearing approximately 200,000 tons. Results obtained at 255 stations, examined in detail, showed the average density to be 37 lb. per sq. yd. The width of the zone is from 2 to 300 yd., the average being 50 yd. Ascophyllum nodosum forms the greatest percentage of rockweed, Fucus vesiculosus ranking next. Fucus serratus is recorded for the first time in this part of the Province. Laminaria beds totalling 12,000 ac. in extent and bearing 900,000 tons were charted. Mortality among Laminaria sporophytes is high and the number in a bed varies from year to year. In 1950 7,997,739 lb. of Chondrus were harvested. Density varies from 1 to [Formula: see text] lb. per sq. ft. Chondrus beds are listed and their ecology discussed. Recolonization of denuded areas is described and succession of algal cover noted on denuded areas and on concrete blocks placed in Chondrus and Laminaria beds. The survey region is compared with regions surveyed in Scotland. A map of the survey region is included.

scholarly journals Green extraction of proteins, umami and other free amino acids from brown macroalgae Ascophyllum nodosum and Fucus vesiculosus

2021 ◽  
Author(s):  
Viruja Ummat ◽  
Marco Garcia-Vaquero ◽  
Mahesha M. Poojary ◽  
Marianne N. Lund ◽  
Colm O’Donnell ◽  
...  
Keyword(s):  
Amino Acids ◽  
Citric Acid ◽  
Free Amino Acids ◽  
Free Amino ◽  
Food Industry ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Green Solvents ◽  
Brown Macroalgae ◽  
Extraction Solvent

AbstractSeaweeds are a valuable potential source of protein, as well as free amino acids (FAAs) with umami flavour which are in high demand by the food industry. The most commonly used flavouring agents in the food industry are chemically synthesised and therefore are subject to concerns regarding their safety and associated consumer resistance. This study focuses on the effects of extraction time (1 and 2 h) and solvents (0.1 M HCl, 1% citric acid and deionised water) on the extraction of protein and FAAs including umami FAAs from Irish brown seaweeds (Ascophyllum nodosum and Fucus vesiculosus). Extraction yields were influenced by both the extraction solvent and time, and also varied according to the seaweed used. Both seaweeds investigated were found to be good sources of protein, FAAs including umami FAAs, demonstrating potential application as flavouring agents in the food industry. Overall, the use of green solvents (deionised water and citric acid) resulted in higher recoveries of compounds compared to HCl. The results of this study will facilitate the use of more sustainable solvents in industry for the extraction of proteins and flavouring agents from seaweed.

scholarly journals Clinical Efficacy of Brown Seaweeds Ascophyllum nodosum and Fucus vesiculosus in the Prevention or Delay Progression of the Metabolic Syndrome: A Review of Clinical Trials

Molecules ◽  
2021 ◽  
Vol 26 (3) ◽  
pp. 714
Author(s):  
Enver Keleszade ◽  
Michael Patterson ◽  
Steven Trangmar ◽  
Kieran J. Guinan ◽  
Adele Costabile
Keyword(s):  
Metabolic Syndrome ◽  
Clinical Trials ◽  
Brown Seaweed ◽  
Public Health Problem ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Total Phenolic ◽  
World Population ◽  
Brown Seaweeds ◽  
The Metabolic Syndrome

Metabolic syndrome (MetS) is a global public health problem affecting nearly 25.9% of the world population characterised by a cluster of disorders dominated by abdominal obesity, high blood pressure, high fasting plasma glucose, hypertriacylglycerolaemia and low HDL-cholesterol. In recent years, marine organisms, especially seaweeds, have been highlighted as potential natural sources of bioactive compounds and useful metabolites, with many biological and physiological activities to be used in functional foods or in human nutraceuticals for the management of MetS and related disorders. Of the three groups of seaweeds, brown seaweeds are known to contain more bioactive components than either red and green seaweeds. Among the different brown seaweed species, Ascophyllum nodosum and Fucus vesiculosus have the highest antioxidant values and highest total phenolic content. However, the evidence base relies mainly on cell line and small animal models, with few studies to date involving humans. This review intends to provide an overview of the potential of brown seaweed extracts Ascophyllum nodosum and Fucus vesiculosus for the management and prevention of MetS and related conditions, based on the available evidence obtained from clinical trials.

Importance du régime de dénudation sur la structure et la succession des communautés intertidales de substrat rocheux en milieu subarctique

1983 ◽  
Vol 40 (8) ◽  
pp. 1278-1292 ◽  
Author(s):  
Diane Archambault ◽  
Edwin Bourget
Keyword(s):  
Early Stage ◽  
Ascophyllum Nodosum ◽  
Fucus Vesiculosus ◽  
Tidal Level ◽  
Developmental Patterns ◽  
Lawrence Estuary ◽  
Long Period ◽  
Study Sites ◽  
St Lawrence Estuary ◽  
Balanus Balanoides

Developmental patterns were studied following natural (abrasion by ice) and experimental disturbances (total or partial clearings) in intertidal rocky communities. Four semi-exposed communities along the St. Lawrence Estuary and Gulf were studied from May 1977 to May 1979. In the spring, when free space becomes available, annual algae, mainly Ulothricales and Ulvales, rapidly colonize areas denuded by ice abrasion. This early stage is soon followed by an abundant fucoid growth, largely Fucus vesiculosus but also some Ascophyllum nodosum, and a large number of Balanus balanoides, along with some Mytilus edulis. Opportunists, F. vesiculosus and B. balanoides, dominate where ice disturbances are severe and regular but where the community is not severely disturbed, initial differences in the abundance of F. vesiculosus and A. nodosum are reduced, and the community becomes closer to the mature one dominated by A. nodosum. The period of disturbance influences the species' settling and their abundance. The earlier the disturbance in the spring, the greater will be the colonization by the opportunists Ulothricales, Ulvales, and B. balanoides, but when the disturbance occurs later, F. vesiculosus and M. edulis are the main settlers. The tidal level influences mainly the establishment of dominance. In the mid zone, few species are present, densities are low, competition is not an important controlling factor, and Balanus dominate. In the low zone, barnacles are replaced by mussels, the number of species and densities are high, and competition is greater. Exclosure and enclosure experiments using cages have shown that littorinid grazers have a negligible influence on the reduction of the dominant annual alga Ulothrix flacca. Its reduction in midsummer appears to be related to its life cycle. Predators were rarely observed at the study sites. Structural and developmental patterns of intertidal rocky communities were slow and the monopolization of space by A. nodosum and M. edulis, as observed in the mature, less disturbed community, must result from a long period [Formula: see text] without major disturbances.

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