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Academic literature on the topic 'Macroalgue'

Author: Grafiati

Published: 25 May 2024

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Journal articles on the topic "Macroalgue"

Dziergowska, Katarzyna, Maja Wełna, Anna Szymczycha-Madeja, Jacek Chęcmanowski, and Izabela Michalak. "Valorization of Cladophora glomerata Biomass and Obtained Bioproducts into Biostimulants of Plant Growth and as Sorbents (Biosorbents) of Metal Ions." Molecules 26, no. 22 (November 16, 2021): 6917. http://dx.doi.org/10.3390/molecules26226917.

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The aim of this study was to propose a complete approach for macroalgae biomass valorization into products useful for sustainable agriculture and environmental protection. In the first stage, the effects of macroalgal extracts and ZnO NPs (zinc oxide nanoparticles) on the germination and growth of radish were examined. Macroalgal extract was produced from freshwater macroalga, i.e., Cladophora glomerata by ultrasound assisted extraction (UAE). The extract was used to biosynthesize zinc oxide nanoparticles. In germination tests, extracts and solutions of ZnO NPs were applied on paper substrate before sowing. In the second stage, sorption properties of macroalga, post-extraction residue, and ZnO NPs to absorb Cr(III) ions were examined. In the germination tests, the highest values of hypocotyl length (the edible part of radish), i.e., 3.3 and 2.6 cm were obtained for 60 and 80% extract (among the tested concentrations 20, 40, 60, 80, and 100%) and 10 and 50 mg/L NPs, respectively. The highest sorption capacity of Cr(III) ions (344.8 mg/g) was obtained by both macroalga and post-extraction residue at a pH of 5 and initial Cr(III) ions concentration of 200 mg/L. This study proves that macroalgae and products based on them can be applied in both sustainable agriculture and wastewater treatment.

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Diansyah, Sufal, Ika Kusumawati, and Fandi Hardinata. "INVENTARISASI JENIS-JENIS MAKROALGA DI PANTAI LHOK BUBON KECAMATAN SAMATIGA KABUPATEN ACEH BARAT." JURNAL PERIKANAN TROPIS 5, no. 1 (April 1, 2018): 93. http://dx.doi.org/10.35308/jpt.v5i1.1029.

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Indonesia has tropical marine waters rich in biodiversity. One of the organisms living in Indonesian coastal waters is macroalgae. Algae is one of the marine natural resources of economic value and has an ecological role as a high producer in the food chain and spawning place of marine biota. types of macroalgae have many benefits, ecologically and economically for the community. The ecological benefits of macroalgae are to provide habitat for several types of marine life such as species of crustaceans, mollusca, echinoderms, fish or other small algae. The economic value of macroalgae can be used as food, industrial raw materials, and materials for laboratories such as wet preserved materials, media materials for bacterial and fungal breeding to produce antibiotics, and there are also macroalgal types used as medicines. This study aims to identify and inventory the types of macroalgae in Lhok Bubon waters. The research method used is survey method, by identifying macroalga and inventory of macroalga contained in research location. The results of identification of macroalgae in Lhok Bubon waters are Caulerpa racemosa, Chaetomorpha anteninna, Halimeda micronesica, Boegesenia forbesi, Cladhopora hespetica, Halimeda discoidea, Chaetomorpha sp, Sargasum sp., Sargasum natans, Padina australis, Turbinaria ornata, Canistrocaptus crispatus, Asparagopsis taxiformis, Galaxaura filamentosa, dan Halymenia durvillei.

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Siqueiros Beltrones, D. A., and O. U. Hernández Almeida. "FLORÍSTICA DE DIATOMEAS EPIFITAS EN UN MANCHÓN DE MACROALGAS SUBTROPICALES." CICIMAR Oceánides 21, no. 1-2 (December 31, 2006): 11. http://dx.doi.org/10.37543/oceanides.v21i1-2.25.

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Se determinó la composición de especies de diatomeas epifitas en macroalgas de distintos taxa en una zona subtropical. Para ello, en un manchón ubicado en la playa Punta Roca Caimancito, B. C. S., se tomaron muestras de las macroalgas sobresalientes, en junio y diciembre de 2001, y abril, mayo y julio del 2002. Se identificaron 13 especies de macroalgas, de las cuales: Hydroclathrus clathrathus, Laurencia pacifica, L. johnstonii, Padina mexicana, P. caulescens y Codium spp. fueron las más conspicuas. El examen de la flora epifítica redituó 278 taxa de diatomeas, que es la máxima riqueza registrada para este tipo de sustrato, y de los cuales 44 son nuevos registros para la región. De los 75 géneros reconocidos de diatomeas, los mejor representados fueron: Mastogloia (25 especies), Amphora (23), Navicula (23), Nitzschia (22), Cocconeis (22), Lyrella (12) y Achnanthes (11). Los taxa más abundantes fueron Cocconeis disculus y C. dirupta. El número de taxa de diatomeas por especie hospedera también fue alto y varió entre 89 ( Codium spp.) y 143 ( L. pacifica), aunque las diferencias podrían deberse al número de especímenes procesados por especie de macroalga. Floristics of epiphytic diatoms in a patch of subtropical macroalgae The species composition of epiphytic diatom assemblages found on different taxa of subtropical macroalgae was determined. Samplings were carried out in a macroalgae bed located in Punta Roca Caimancito beach, B. C. S. in june and december 2001, and on april, may and july 2002, collecting the most frequent macroalgae taxa. The most conspicuous out of twelve macroalgae taxa were: Hydroclathrus clathrathus, Laurencia pacifica, L. johnstonii, Padina mexicana and P. caulescens. A total of 278 diatom taxa were recorded. This is the largest species richness recorded for this type of substrate, and out of which 44 are new records for the region. Out of 75 genera recognized the best represented were: Mastogloia (25 species), Amphora (23), Navicula (23), Nitzschia (22), Cocconeis (22), Lyrella (12) and Achnanthes (11). The most abundant taxa were Cocconeis disculus and C. dirupta. The number of diatom taxa per macroalgae species was also high, ranging from 89 (Codium spp.) to 143 (L. pacifica). Albeit, this difference could be attributed to the number of specimens collected per macroalga species.

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Bauman, Andrew G., Jovena C. L. Seah, Fraser A. Januchowski-Hartley, Andrew S. Hoey, Jenny Fong, and Peter A. Todd. "Fear effects associated with predator presence and habitat structure interact to alter herbivory on coral reefs." Biology Letters 15, no. 10 (October 2019): 20190409. http://dx.doi.org/10.1098/rsbl.2019.0409.

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Non-consumptive fear effects are an important determinant of foraging decisions by consumers across a range of ecosystems. However, how fear effects associated with the presence of predators interact with those associated with habitat structure remain unclear. Here, we used predator fish models ( Plectropomus leopardus ) and experimental patches of the macroalga Sargassum ilicifolium of varying densities to investigate how predator- and habitat-associated fear effects influence herbivory on coral reefs. We found the removal of macroalgal biomass (i.e. herbivory) was shaped by the interaction between predator- and habitat-associated fear effects. Rates of macroalgal removal declined with increasing macroalgal density, likely due to increased visual occlusion by denser macroalgae patches and reduced ability of herbivorous fishes to detect the predators. The presence of the predator model reduced herbivory within low macroalgal density plots, but not within medium- and high-density macroalgal plots. Our results suggest that fear effects due to predator presence were greatest at low macroalgal density, yet these effects were lost at higher densities possibly due to greater predation risk associated with habitat structure and/or the inability of herbivorous fishes to detect the predator model.

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Strong, James A., Christine A. Maggs, and Mark P. Johnson. "The extent of grazing release from epiphytism forSargassum muticum(Phaeophyceae) within the invaded range." Journal of the Marine Biological Association of the United Kingdom 89, no. 2 (March 2009): 303–14. http://dx.doi.org/10.1017/s0025315408003226.

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The overall biotic pressure on a newly introduced species may be less than that experienced within its native range, facilitating invasion. The brown algaSargassum muticum(Yendo) Fensholt is a conspicuous and successful invasive species originally from Japan and China. We comparedS. muticumand native macroalgae with respect to the biotic pressures of mesoherbivore grazing and ectocarpoid fouling. In Strangford Lough, Northern Ireland,S. muticumthalli were as heavily overgrown with seasonal blooms of epiphytic algae as native macroalgal species were. The herbivorous amphipodDexamine spinosawas much more abundant onS. muticumthan on any native macroalga. When cultured with this amphipod,S. muticumlost more tissue than three native macroalgae,Saccharina latissima(Linnaeus) Laneet al.,Halidrys siliquosa(Linnaeus) Lyngbye andFucus serratusLinnaeus.Sargassum muticumcultured with both ectocarpoid fouling and amphipods showed a severe impact, consistent with our previous findings of large declines in the density ofS. muticumobserved in the field during the peak of fouling. Despite being a recent introduction into the macroalgal community in Strangford Lough,S. muticumappears to be under biotic pressure at least equal to that on native species, suggesting that release from grazing and epiphytism does not contribute to the invasiveness of this species in Strangford Lough.

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Hagar Kamal Ahmed, Samia Heneidak, Abdel-Hamied Mohammed Rasmey, and Gihan Ahmed El Shoubaky. "Fatty acids composition and profiling of nine abundant marine Macroalgae, Egypt." GSC Biological and Pharmaceutical Sciences 24, no. 2 (August 30, 2023): 099–109. http://dx.doi.org/10.30574/gscbps.2023.24.2.0311.

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This study analyzed the fatty acids composition and their profile qualitatively and quantitatively of the nine abundant macroalgal specimens collecting from Egyptian coasts. GC mass analysis identified 23 types, including 13 of saturated fatty acids (SFA) and 10 of monounsaturated fatty acids (MUSFA). SFA dominated with 78%, while MUFAs had 22%, and UFAs were negligible at 0.01%. MUSFA oleic acid (omega-9) was present in all species except green macroalgae Galaxura rugosa and Ulva fasciata, replaced by MUSFA linoleic acid (omega-6). Oleic acid methyl ester (omega-9) was registered in all the studied species, except red Hypnea cornuta & Jania rubens, and brown Hormophysa cuneiformis. Chlorophyta registered 35% of the fatty acid composition, followed by Rhodophyta (33%) and Phaeophyta (32%). Major SFAs were palmitic acid glycidyl ester, oleic acid glycidyl ester and palmitic methyl ester, comprising over half of total fatty acids. Red and brown macroalgae were richer in palmitic and oleic glycidyl esters, while green macroalgae had more palmitic methyl ester. Linoleic acid, nonadecylic acid, elaidic acid methyl ester, linoleic acid methyl, behenic acid, pentacosylic acid, palmitic acid, and trans-palmitoleic acid were exclusively identified in Chlorophyta. Lacceroic acid was distinguished in Rhodophyta, whereas pelargonic acid just appeared in brown alga Turbinaria turbinata. The maximum values of fatty acids were recorded in the green macroalga Caulerpa racemosa while reed macroalga Hypnea cornuta.was the minimum one. The research sheds light on the fatty acid composition and its potential implications for human health and nutrition.

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Pederson, Hugh G., and Craig R. Johnson. "Growth and age structure of sea urchins (Heliocidaris erythrogramma) in complex barrens and native macroalgal beds in eastern Tasmania." ICES Journal of Marine Science 65, no. 1 (November 20, 2007): 1–11. http://dx.doi.org/10.1093/icesjms/fsm168.

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Abstract Pederson, H. G., and Johnson, C. R. 2008. Growth and age structure of sea urchins (Heliocidaris erythrogramma) in complex barrens and native macroalgal beds in eastern Tasmania. – ICES Journal of Marine Science, 65: 1–11. The formation of small-scale barrens of sea urchins on the east coast of Tasmania allows for direct comparison of the growth rates and age structures of sea urchin populations in barrens and habitats dominated by native macroalgae. However, such barrens are atypical of any previously described in temperate regions worldwide mainly because of the establishment and seasonal colonization by the introduced macroalga Undaria pinnatifida. Growth models were fitted to sea urchin (Heliocidaris erythrogramma) data, based on tag-recapture information from two distinct community types, a native macroalgal bed and a sea urchin barren colonized by U. pinnatifida. Despite the distinct contrast in habitats, size-at-age relationships and age frequency distributions were not significantly different between the two populations. However, the relationship between jaw length and test diameters was significantly different between populations, sea urchins in barrens possessing larger jaws relative to conspecifics of similar test diameter in native macroalgal habitats. It is proposed that the growth of sea urchins on barrens is not adversely affected by the loss of native macroalgae in the presence of U. pinnatifida. However, sea urchins display a level of resource limitation in barrens because of differences in the relationships of sea urchin morphometrics.

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Martins, Nuno Tavares, Maria Alves Napolitani, João Pedro Guimarães Machado, Yocie Yoneshigue-Valentin, and Vinícius Peruzzi Oliveira. "Competitive interactions in marine macroalgae: an analysis of the literature by boolean operators." OBSERVATÓRIO DE LA ECONOMÍA LATINOAMERICANA 21, no. 8 (August 23, 2023): 9675–700. http://dx.doi.org/10.55905/oelv21n8-099.

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Marine macroalgae are the ecological basis in most of the marine environments. Light and space, added to nutrients rank among the most important elements influencing their distribution in the marine environment. Thus, this work aimed to identify and quantify the current and past literature on marine macroalgae competitive interactions and to address the main questions on the competitive patterns and their consequences for community structure, as well as to compare the competitive capacity among different macroalgal taxa. To do so, a quantitative literature search was performed based on papers published from 1934 to 2022, using the following combination of Boolean operators and keywords: “Seaweed OR macroalgae OR macroalga, AND ecolog *, AND competiti *”. A total of 173 articles were then compiled and selected. Our results compiled 124 different macroalgae genera with 546 studied taxa on competition processes. Among them, 38% of the compiled taxa belonged to Ochrophyta; 31% Rhodophyta and 18% Chlorophyta. The most-studied genera were Dictyota (6.8%), Sargassum (6.8%), Ulva (4.9%) and Lobophora (4.2%). Space was the most analyzed limiting factor (40.9%), followed by papers related to herbivory (26.1%), and lastly by competition over nutrients (15.1%). Our results, while attesting to the overarching complexity of competitive interactions, nevertheless allowed us to summarize the current knowledge regarding the patterns of competitive interactions on macroalgae, thus providing a useful synthesis for new perspectives on marine systems and research.

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Cordova, Muhammad Reza, and Ahmad Muhtadi. "Skrining Kemampuan Absorpsi Merkuri pada Makroalga Cokelat Hormophysa triquetra dan Makroalga Merah Gracilaria salicornia dari Pulau Pari." Oseanologi dan Limnologi di Indonesia 2, no. 3 (December 28, 2017): 25. http://dx.doi.org/10.14203/oldi.2017.v2i3.93.

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Screening of Mercury Absorption in Brown Macroalgae Hormophysa triquetra and Red Macroalgae Gracilaria salicornia from Pari Island. Macroalgae or seaweed has good absorptive capacity against all substances present in the aquatic environment, including mercury (Hg). The purpose of this study was to determine mercury content in brown macroalga Hormophysa triquetra and red macroalga Gracilaria salicornia and also on sediment and then assess the potential of both types of macroalgae as mercury bioaccumulator. Samples of macroalgae and sediment were taken from the northern, eastern, southern, and western regions of Pari Island, Seribu Archipelago in April 2016, analyzed by Mercury Analyzer NIC MA-3000. The results of this study indicated the mercury content in red macroalgae was higher than brown macroalgae. Mercury content in macroalgae from Pari Island waters was in the range of 21.50 ± 9.59 μg/kg (brown macroalga) and 41.45 ± 14.00 μg/kg (macroalgae red). The complexity of the functional groups makes the mercury content higher in the red macroalgae than in the brown macroalgae. The ability of mercury accumulation makes these macroalgae species potential to become bioaccumulator.

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Dissertations / Theses on the topic "Macroalgue"

Greff, Stéphane. "Métabolomique, effets biologiques et caractère invasif de la macroalgue Asparagopsis taxiformis." Thesis, Aix-Marseille, 2016. http://www.theses.fr/2016AIXM4358/document.

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Considérées comme des menaces pour les écosystèmes marins tropicaux et subtropicaux, les proliférations de macroalgues sont susceptibles de modifier le fonctionnement et la structure des récifs coralliens. Le genre Asparagopsis (Rhodophyta) est connu pour être largement distribué, introduit et parfois invasif dans certaines régions comme en Méditerranée occidentale. Le premier objectif était de corréler le métabolisme spécialisé et la bioactivité de l’algue à son génotype, et éventuellement à son caractère proliférant. Aucune corrélation génétique/métabolomique n’a été démontrée, ce qui laisse entendre que le métabolisme macroalgal serait principalement influencé par l'environnement et/ou sa flore microbienne associée. En milieu tempéré, A. taxiformis et A. armata présentent des signatures métabolomiques globalement similaires et associées à une bioactivité significativement plus importante qu'en milieu tropical. Cependant, même lorsqu’elle a été introduite, une même lignée génétique et un même phénotype chimique peuvent présenter des caractères proliférants opposés. En milieu tropical, les extraits de macroalgues testés in situ sur 4 espèces de coraux n'ont provoqué que de faibles blanchissements. En milieu tempéré, aucun effet biologique de l’algue n’a été enregistré sur le corail Astroides calycularis. Par contre des expériences en aquarium ont permis de montrer qu’A. taxiformis pouvait exprimer un métabolisme spécifique avec une bioactivité augmentée après 10 jours de contact avec ce corail. En conclusion, qu’elle soit indigène ou introduite, A. taxiformis exerce peu d’effets sur la santé des coraux, et le caractère invasif de cette algue reste une source de débat
Considered as a major threat for sub–tropical and tropical ecosystems, macroalgal proliferations are susceptible to modify the structure and the functioning of coral reefs. The genus Asparagopsis (Rhodophyta) is known to be widespread, introduced and sometimes invasive in certain regions such as the Western Mediterranean Sea. The first objective of this thesis was to correlate the algal specialized metabolism and its bioactivity with its genotype, and eventually with its proliferation trait. No correlation between genetics and metabolomics has been demonstrated, which would suggest the main influence of environmental factors and/or the associated microbial diversity on the algal metabolism. In temperate regions, A. taxiformis and A. armata showed similar metabolomic fingerprints with bioactivities significantly higher than in tropical regions. However, even when it is introduced, a given genetic lineage and a given chemical phenotype can exhibit opposite proliferative traits. In tropical areas, algal extracts tested in situ on 4 coral species did not lead to any coral bleaching. In temperate areas, no biological effect of the alga was recorded on Astroides calycularis. However, some aquarium experiments allowed to show that A. taxiformis can express a specific metabolism, with an increased bioactivity after 10–days of contact with this coral. To conclude, either indigenous or introduced, A. taxiformis poorly affects corals’ health, and thus the invasiveness of this alga remains a matter of debate

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Garcia, Bueno Nuria. "Valorisation de la macroalgue proliférante Grateloupia turuturu dans l'élevage de l'ormeau européen Haliotis tuberculata." Nantes, 2015. http://archive.bu.univ-nantes.fr/pollux/show.action?id=8a5546e0-7d93-4de3-93cb-8783c4bc12fd.

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L'ormeau Haliotis tuberculata, dont l'aquaculture est peu développée en Europe, apparaît comme un candidat potentiel pour la diversification des activités conchylicoles. Cependant, sa production rencontre deux principales limites. Tout d'abord, l'approvisionnement des élevages en nourriture de qualité constituent une dépense majeure des entreprises. De plus, ces dernières années, les populations naturelles tout comme les élevages ont subi de fortes mortalités liées à la bactérie pathogène Vibrio harveyi. Par son caractère prolifératif, l'algue rouge Grateloupia turuturu, présente sur la côte atlantique, constitue une biomasse disponible qui pourrait être valorisée pour l'aquaculture de l'ormeau. En effet, Grateloupia turuturu dispose d. Une composition biochimique intéressante pour la croissance de l'ormeau qui montre une nette préférence pour les algues rouges. Des tests d'alimentation on été réalisés en élevage. Il apparait que cette algue n'est pas utilisable à l'état frais comme aliment principal mais pourrait constituer un complément alimentaire. De plus, il a été récemment mis en évidence que cette espèce présente une activité antibactérienne. Cette activité a été confirmée in vivo et in vitro sur la souche pathogène ORM4 de Vibrio harveyi
Abalone Haliotis tuberculata, which farm production is not well developed in Europe, seems a potential candidate for the diversification of shellfish aquaculture. However, its production faces two main limitations. First, the supply of livestocks in quality food are a major expense for enterprises. Second, in recent years, natural populations as well as livestocks have suffered high mortalities related to the pathogenic bacterium Vibrio harveyi. Because of its proliferative nature, red seaweed Grateloupia turuturu, present on the Atlantic coast, constitute represent an available biomass that could be valorized in abalone aquaculture. Indeed, Grateloupia turuturu presents a biochemical composition that could be of interest for abalone. S growth. This species shows a clear preference for red seaweeds. Nutritional tests have been made on livestocks. It appeared that seaweed cannot be used fresh as main feed but it could be a dietary supplement. In addition, it has recently been demonstrated that this species has an antibacterial activity. This activity was confirmed in vivo and in vitro using the pathogenic strain of Vibrio haveyi ORM4

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Paix, Benoît. "Etude des dynamiques spatio-temporelles des interactions entre le microbiote et le métabolome de surface de la macroalgue Taonia atomaria par une approche multi-omiques." Electronic Thesis or Diss., Toulon, 2020. http://www.theses.fr/2020TOUL0012.

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En tant qu’espèces ingénieures de leurs écosystèmes et que producteurs primaires, les macroalgues marines jouent un rôle crucial au sein de leur écosystème. Les interactions chimiques avec leurs microorganismes épiphytes semblent particulièrement essentielles pour leur physiologie. Cependant les relations macroalgues-microbiote et le rôle des paramètres environnementaux dans ces interactions restent encore peu explorées. L’objectif général de la thèse est de comprendre comment varie la structure de la communauté procaryotique épiphyte de l’algue brune Taonia atomaria en lien avec les variations de la production métabolique de surface de l’hôte et quelle est l’influence de l’environnement sur ces variations qui affectent et façonnent ce modèle d’holobionte. Une approche multi-omiques, couplant l’étude des communautés procaryotes épiphytes par metabarcoding et l’étude des métabolites de surface par des analyses optimisées en métabolomique, a ainsi été employée conjointement avec d’autres analyses telle que la cytométrie en flux. Les résultats obtenus ont révélé que la communauté microbienne épiphyte de T. atomaria, lui était spécifique en comparaison avec les communautés de biofilms de substrats rocheux et celles planctoniques, suggérant un rôle possible du métabolome de surface. Entre outre, d’importantes co-variations entre le métabolome et le microbiote à la surface de l’algue ont été observées à différents niveaux, que ce soit à l’échelle du thalle, de la dynamique temporelle ou encore d’un point de vue biogéographique. Certains paramètres environnementaux semblent être particulièrement impliqués dans les interactions au sein de l’holobionte, tels que la température, la contamination en cuivre, mais aussi l’intensité lumineuse. Dans un contexte de Changement Global, ces travaux apportent de nouvelles perspectives permettant de mieux appréhender la dynamique des macroalgues-holobiontes
As ecosystems engineers and primary producers, marine seaweeds play important roles for other organisms. Chemical interactions with epiphytic microorganisms seem particularly important for their physiology. However, macroalgae-microbiota relationships and the role of environmental parameters remains poorly investigated. The main objective of this PhD thesis was to understand how vary the epiphytic prokaryotic community of the brown alga Taonia atomaria, in relationship with variations of the surface metabolome of the host and what is the influence of the environment on these variations which shape this holobiont model. A multi-omics approach coupling prokaryotic communities studies by metabarcoding and surface metabolites studies by an optimized metabolomics analysis, has been jointly conducted, together with further analyses such as flow cytometry. Studies have thus revealed that the epiphytic microbial community of T. atomaria was specific in comparison with the biofilm communities of rocky substrates, and planktonic ones, suggesting a possible role of the surface metabolome in the structuring of the microbiota. Otherwise, important co-variations between the metabolome and the microbiota at the algal surface were observed at different levels, whether at the thallus or biogeographical scale, or during temporal dynamics. Some environmental parameters seem to be particularly involved in these interactions, such as temperature, copper contamination, but also irradiance. In a context of Global Change, this work provides new perspectives allowing to better understand dynamics of macroalgal-holobionts

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Bréchignac, François. "Photosynthèse et photorespiration chez la macroalgue marine Chondrus crispus : substrat carboné absorbé et nature de la prise d'oxygène." Paris 7, 1985. http://www.theses.fr/1985PA077013.

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Conçu pour le milieu aquatique, un dispositif expérimental permet la quantification continue et en conditions contrôlées de la photosynthèse, de la photorespiration et de la respiration chez la macroalgue marine Chondrus crispus (Rhodophycées, Gigartinales). Mesurée au moyen d'une colonne d'échanges, l'évolution de la concentration en CO₂ dissous en régime stationnaire indique l'existence d'une importante résistance aux transferts de CO₂ à l'interface air-eau, et l'absorption préférentielle du carbone inorganique externe sous forme HCO⁻₃. La forte affinité apparente de la photosynthèse pour le CO₂ (Km (CO₂) ≃ 1 µM) est la conséquence de l'absorption directe de HCO⁻₃ laquelle concentrerait le carbone inorganique dans l'espace intracellulaire. Mesurée par la méthode à 1'18O₂, la photoconsommation d'O₂ présente une faible amplitude en conditions standard, peu de sensibilité au CO₂ et une vitesse supérieure à la respiration nocturne quand le CO₂ est sursaturant. Elle s'avère par ailleurs sensible à 1'O₂ (Km (O₂) ≃ 4 à 16%), comme la photosynthèse nette (40 à 70% d'effet Warburg), quand la concentration n'excède pas 30%. Suggérée par ces résultats, la nature composite de la photoconsommation d'O₂ est confirmée par l'influence de l'intensité lumineuse, de la température et de quelques inhibiteurs : maintien sous lumière de la respiration mitochondriale, implication de la voie du glycolate à 45% au mieux dans la prise totale d'O₂, qui résulte alors surtout de la réaction de Mehler, voire d'une chlororespiration.

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Sayed, Walaa. "Évaluation des potentialités d’une filière de macroalgues vertes cellulosiques pour la production de bioéthanol." Rennes, Ecole nationale supérieure de chimie, 2017. http://www.theses.fr/2017ENCR0044.

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Boulho, Romain. "Application de procédés éco-responsables pour l’extraction de molécules de la macroalgue Solieria chordalis, caractérisations chimiques et étude d'activités biologiques." Thesis, Lorient, 2017. http://www.theses.fr/2017LORIS465/document.

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Ce projet de thèse a été réalisé au sein du Laboratoire de Biotechnologie et Chimie Marines. Ce travail est le fruit d’une collaboration au niveau régional avec deux entreprises morbihannaises Armen Instruments et Newonat et au niveau international avec l’institut de recherche CINVESTAV au Mexique. Solieria chordalis (Rhodophyta, Gigartinales) est une algue proliférante de la côte de Bretagne sud. Cette algue s’échoue chaque année sur la presqu’île de Rhuys dans le Morbihan, et représente une biomasse importante encore sous exploitée. Les objectifs de cette thèse portent sur l’application de différents procédés éco-responsables (CO2 supercritique, Extraction Assistée par Enzyme et Extraction Assistée par Microondes) utilisés pour l’extraction de molécules à partir de S. chordalis. Dans le cadre de la première partie, l’extraction assistée par microondes a permis la production d’extraits polysaccharidiques de faibles poids moléculaires non cytotoxiques dont l’efficacité antivirale est supérieure à celle observée pour les fractions obtenues après extraction aqueuse à haute température. La deuxième partie concerne le couplage de différents procédés : Extraction Assistée par Enzymes (EAE), CO2 supercritique et Extraction Assistée par Microondes (EAM). En fonction des procédés utilisés, différentes familles de molécules ont pu être caractérisées. Le couplage de procédés permet de proposer un schéma de bioraffinage. La dernière partie porte sur l’optimisation d’une méthode de fractionnement par Chromatographie de Partage Centrifuge (CPC). Ce système de purification innovant a conduit à l’isolement de composés naturels dont des Mycosporines-like Amino Acids ayant différentes propriétés valorisables dans le domaine de la cosmétique. Ces travaux enrichissent les connaissances sur l’algue S. chordalis et ouvrent la voie à la valorisation de cette biomasse proliférante sur les côtes bretonnes
This thesis has been carried out within the Laboratoire de biotechnologie et Chimie Marines. Theproject is an outcome of the collaboration of two regional companies, Armen Instruments and Newonat with an international research institute, CINVESTAV, Mexico. The red algae, Solieria chordalis (Rhodophyta, Gigartinales) is a proliferative seaweed native in the southern coast of Brittany. Every year, on the Rhuys peninsula in Morbihan, S. chordalis grows abundantly which represents a large amount of biomass, being still unused. The aim of this project, focused on the application of different ecofriendly processes (Supercritical carbon dioxide, Enzymatic Assisted Extraction and Microwave Assisted Extraction) used for the extraction of biocompounds from S. chordalis. Under the first part, the Microwave Assisted Extraction allowed to produce low molecular weight polysaccharide extracts with no cytotoxicity. These extracts showed an improved antiviral efficiency compared to those obtained by the conventional method. The second part focused on the interaction between different processes: Supercritical CO2, Enzymatic Assisted Extraction (EAE) and Microwave Assisted Extraction (MAE). The sequences of the processes allowed to propose a biorefinery perspective. The last part dealt with the optimization of fractionating method by Centrifugal Partition Chromatography (CPC). This innovative purification system led to isolate natural compounds such as Mycosporine-like Amino Acids with different properties, which can be valorized in the cosmetic field. This work enriches the knowledge of the seaweed S. chordalis and open a way of upgrading the proliferative biomass on the Brittany coasts

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Lafontaine, Nadège. "Elaboration de systèmes de multiplication in vitro chez des algues marines." Caen, 2011. http://www.theses.fr/2011CAEN2095.

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Chez les Rhodophytes et les Chlorophytes, certaines espèces sont des algues d’intérêt dermocosmétique. Elles sont actuellement récoltées ce qui entraîne des problèmes d’approvisionnement, d’hétérogénéité du matériel et de préservation des ressources naturelles. Pour produire toute l’année de la biomasse algale de qualité, différents systèmes de multiplication in vitro ont été évalués chez sept espèces. Pour quatre d’entre elles, des systèmes de micropropagation tenant compte de leurs particularités morphologiques, physiologiques et biochimiques et de leur comportement in vitro ont été mis au point. Une souche-mère in vitro à croissance lente chez une Chlorophyte a été mise en place par bouturage et les conditions physico-chimiques permettant à partir de la souche-mère d’établir des souches à croissance rapide ont été identifiées, seules ces dernières produisant des protoplastes. Chez une autre Chlorophyte, un système en boucle s’affranchissant complètement de la récolte a été réalisé à partir de prairies in vitro issues de protoplastes. La culture d’explants sur milieu solide chez deux Rhodophytes a mis en évidence leurs potentialités morphogénétiques dont la régénération de bourgeons. Chez une de ces deux Rhodophytes, la voie des protoplastes est également possible, la production de protoplastes a été optimisée mais seule la régénération sporadique de la paroi a été observée. Par contre, pour deux autres Rhodophytes, des protoplastes ont été obtenus suggérant la faisabilité de cette voie à condition de contourner l’intolérance à l’immersion pour l’une et de définir un protocole d’axénisation pour l’autre
Among Rhodophyta and Chlorophyta, some species have a dermocosmetic interest. For the time being seaweeds are harvested from wild populations leading to problems of supply, heterogeneous biomass and preservation of natural resources. In order to produce an algal biomass of quality throughout the year different systems of micropropagation were evaluated for seven species. For four of them systems of in vitro propagation based on their morphological, physiological and biochemical properties and their in vitro behavior were developed. A slow-growing stock culture of one Chlorophyta was initiated by cuttings and the physicochemical parameters were identified allowing to the establishment of fast-growing cultures. Protoplasts were produced only from these fast-growing cultures. A closed-loop system of micropropagation was elaborated from ‘in vitro seaweed beds’ of another Chlorophyta produced from protoplasts. Tissue culture on solid medium of two Rhodophyta showed their morphogenetic potentialities in particular the regeneration of shoots. The system of in vitro propagation from protoplasts is also possible for one of these Rhodophyta, the production of protoplasts was improved but only the sporadic regeneration of the cell wall was observed. Protoplasts were also obtained from two other Rhodophyta suggesting the feasibility of developing protoplast technology provided to bypass the intolerance of the immersion for the one and to elaborate the sterilization treatment for the other

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Drouin, Annick. "Établissement et impacts de la macroalgue non indigène « Codium fragile ssp. fragile » dans les herbiers marins aux îles de la Madeleine." Thesis, Université Laval, 2013. http://www.theses.ulaval.ca/2013/29902/29902.pdf.

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Les invasions biologiques sont reconnues comme une menace importante pour les écosystèmes, en particulier pour les écosystèmes côtiers. Originaire d’Asie, la macroalgue verte Codium fragile ssp. fragile (synonyme de ssp. tomentosoides, ci-après Codium) a été observée pour la première fois dans l’est du Canada en 1989 et prolifère depuis sur toutes les côtes du sud du golfe du Saint-Laurent. Cette algue est connue pour s’établir sur les côtes rocheuses, mais il a récemment été observé qu’elle est également capable de coloniser les habitats sableux et d’y former de denses populations en se fixant sur les rhizomes de la plante marine Zostera marina. L’objectif principal de cette thèse était de connaître les impacts de l’établissement de Codium dans les herbiers marins des îles de la Madeleine. L’étude du recrutement de Codium a démontré que l’expansion de la population de Codium était possible au sein des herbiers marins étudiés, mais que la colonisation était plutôt lente. De plus, il a été observé que le succès d’établissement de Codium dans les herbiers marins était variable spatialement. Là où Codium peut atteindre une grande biomasse, une expérience in situ a démontré que cela peut avoir un effet négatif sur la densité de zostère et les réserves d’hydrates de carbone dans les rhizomes. L’opacité du couvert algal serait le mécanisme expliquant ces observations en ayant pour effet de limiter la croissance clonale de la zostère, ainsi qu’influencer son allocation d’énergie. Ces effets n’étaient cependant pas perceptibles dans les herbiers naturellement envahis. Comme démontré par l’expérimentation, les effets sur la zostère ont lieu que lorsque Codium atteint une grande densité; or l'abondance de Codium varie annuellement et surtout les grandes biomasses sont peu fréquentes au sein des herbiers naturellement envahis. Il fut également démontré que les thalles de Codium offrent un habitat distinct des tiges de zostère pour l’épifaune, qui était plus abondante et diversifiée sur Codium. À plus grande échelle, la présence de Codium dans les herbiers influençait la distribution des poissons en favorisant la densité de certaines espèces. Finalement, aucun effet nuisible n’a été détecté sur la faune indigène.
Biological invasions are recognized as an important threat to ecosystems, in particular for coastal ecosystems. Native of Asia, the green seaweed Codium fragile ssp. fragile (synonymous of ssp. tomentosoides, herafter Codium) was first observed in eastern Canada in 1989 and has since been proliferous along the coasts of the southern Gulf of the St. Lawrence. This alga is known to establish on rocky shores, but it has recently been observed colonizing soft bottom habitat also, in particular forming dense canopies on eelgrass (Zostera marina) rhizomes. The main objective of this thesis was to identify the impacts of Codium establishment on eelgrass beds of the îles de la Madeleine. The study of Codium recruitment has shown that population expansion is possible within the studied eelgrass beds, but the colonization was rather low. Moreover, the success of Codium establishment in eelgrass beds varied spatially. Where Codium can reach a high biomass, An in situ experiment revealed that areas with high biomass of Codium can negatively effect eelgrass density and carbohydrate storage in rhizomes. A possible cause for these observations could be the shading created by algal cover, affecting clonal growth by eelgrass as well as influencing the plants allowance of energy. However, these effects were not detectable in naturally invaded beds. As shown, negative effects on eelgrass beds only occured when Codium biomass was high, an infrequent phenomenon that varied annually in the naturally invaded beds. It was also shown that thalli of Codium offer a distinctly different habitat than eelgrass shoots, resulting in more diverse and abundant epifauna on Codium. At a larger scale, the presence of Codium in eelgrass beds was found to influence fish distributions, by promoting higher density of certain species. However, no adverse effects were detected on native fauna.

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Salaün, Stéphanie. "Interactions entre la macroalgue brune Laminaria digitata et ses épibiontes bactériens : études moléculaire et spectroscopiques : capacité d’adhésion et de formation de biofilm." Lorient, 2009. http://hal.upmc.fr/tel-01110841.

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Il est désormais admis que toute surface immergée en eau de mer est rapidement couverte d’un biofilm marin, suivi pour certaines de macrosalissures, essentiellement composées d’organismes marins vivants. Les thalles de macroalgues fournissent des surfaces importantes à la formation de biosalissures. Cependant, leur surface reste la plupart du temps exempt de macrosalissures, peut-être en relation avec leur succès évolutif, montrant leurs multiples stratégies de cohabitation avec leurs colonisateurs. Les macroalgues sont donc des modèles naturels de choix, susceptibles d’inspirer des solutions originales aux problèmes causés par les biofilms marins. Dans cette étude sur les bactéries associées aux thalles de l’algue brune Laminaria digitata, connue pour avoir un métabolisme halogéné particulier, nous avons isolé 18 souches bactériennes épiphytes, séquencé leur ADNr 16S et construit l’arbre phylogénétique correspondant. Puis nous les avons caractérisées par des méthodes spectroscopiques et étudié leur comportement d’adhésion et de formation de biofilm en présence de composés provenant de l’algue. Douze souches bactériennes marines de référence (Gram+ Firmicutes, et Gram– α-proteobacteria, γ-proteobacteria et Bacteroidetes) ont été traitées de la même manière. La taxonomie moléculaire des souches associées à L. Digitata a révélé des bactéries à Gram+ Actinobacteria et à Gram– α-proteobacteria, γ-proteobacteria et Bacteroidetes. Une base de données de profils spectraux des 30 souches a été construite en spectrométrie de masse MALDI-ToF à partir de cellules bactériennes entières. La signature spectrale propre à chaque souche bactérienne s’est révélée être un outil rapide et fiable à des fins taxonomiques. Les profils spectraux obtenus en RMN HR-MAS, également à partir de cellules entières, s’est avérée moins discriminante taxonomiquement que la MALDI-ToF. Cependant, les signatures spectrales variant en fonction du milieu de culture utilisé, la RMN HR-MAS s’est révélée être un outil utile dans l’étude des réponses d’adaptation physiologique bactérienne à l’environnement. Les souches bactériennes ont montré un pouvoir d’adhésion en microplaques en eau de mer filtrée stérile et de formation de biofilm en milieu ZoBell spécifique à la souche. Ces pouvoirs d’adhésion et de formation de biofilm pouvaient être plus ou moins sensible (augmenté ou diminué) lorsque des métabolites extraits et des exsudats de l’algue ont été co-incubés avec les souches. Les bactéries associées à L. Digitata ont été plus sensibles aux exsudats d’algue que les bactéries de référence, avec un effet majoritairement négatif sur l’adhésion et la formation de biofilm. Les métabolites extraits avec des solvants organiques, présents à la surface et dans l’algue, ont un effet majoritairement négatif sur l’adhésion de bactéries associées à l’algue, et positif sur l’adhésion des bactéries de référence. Enfin, des métabolites purs ont également été testés sur ces différentes souches, impliquant des réponses d’adhésion et de formation de biofilm propre à chaque souche
Once immersed in natural seawater, any surface will be rapidly colonized by biofilm forming bacteria, which tend to favour the establishment of sessile invertebrates, algae and protists as assemblages that cause macrofouling. Macrophytic algae represent very large surfaces for potential colonization by microbial and fouling epibionts. Yet actively growing parts are conspicuously devoid of visible epiphytism – presumably as a consequence of their evolutionary success based on a life long history of cohabitation with marine bacteria and other colonizers. As such, algae represent choice models upon which original antifouling biotechnologies may find inspiration. Our study is centered on the kelp Laminaria digitata which enjoys a unique metabolism featuring iodine and bromine processing haloperoxidases, and on its bacterial epiflora. We have isolated 18 cultivatable epiphytic strains of bacteria from selected surfaces of the thallus, we have sequenced their ADNr 16S, and we have built the corresponding phylogenetic tree from matches with online databases. Then, we characterized each strain from intact cell preparations by recording their proteome and their metabolome signature spectra, and finally we studied the adhesion and biofilm forming capabilities of selected strains when exposed to metabolites produced by their L. Digitata host. Twelve marine reference strains isolated from inert surfaces (Gram+ Firmicutes, and Gram– α-proteobacteria, γ-proteobacteria and Bacteroidetes) were treated accordingly as controls. Molecular taxonomy of bacterial strains associated with L. Digitata revealed Gram+ Actinobacteria and Gram– α-proteobacteria, γ-proteobacteria and Bacteroidetes. A spectral databank of 30 strains was built from MALDI-ToF mass spectra from entire cell preparations and the resulting individual signatures were found reliable and fast as taxonomic markers at the strain level. Spectral signatures obtained by proton HR-MAS NMR from intact cell preparations was less discriminative than MALDI-ToF in terms of attribution but quite informative as regards to variations in cultivation parameters and associated physiological responses on behalf of the bacteria. Adhesion and biofilm formation studies on selected strains showed that these processes are strain-specific under standard experimental conditions. Adhesion and biofilm could be modulated (up or down) by addition of exudates and metabolite extracts from L. Digitata that were solubilized in the medium of bacterial strains. Strains naturally associated with L. Digitata were more responsive to exposure to exudates than the environmental reference strains, the global effect being negative. Surface and tissue organic extracts had a globally negative effect on adhesion of bacteria naturally associated with L. Digitata, but showed a positive effect on the adhesion of reference bacteria. Finally, individual metabolites were tested with these bacterial strains, involving strain-specific responses of adhesion and biofilm formation

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Monteiro, Lorena Soares. "AbsorÃÃo de nutrientes pela macroalga Gracilaria Birdiae (Plastino & Oliveira, 2002) sob diferentes condiÃÃes fÃsicoquÃmicas." Universidade Federal do CearÃ, 2011. http://www.teses.ufc.br/tde_busca/arquivo.php?codArquivo=6700.

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CoordenaÃÃo de AperfeiÃoamento de Pessoal de NÃvel Superior
Dentre os recursos oriundos do mar, as macroalgas destacam-se como as de maior aproveitamento industrial. A sua abundÃncia e diversidade as tornam fontes de matÃria-prima para uma infinidade de produtos de uso humano e animal, alÃm dos benefÃcios ambientais resultantes da atividade algal na forma de O2 atmosfÃrico, remoÃÃo de nutrientes da Ãgua, modulaÃÃo climÃtica, combustÃveis fosseis e tambÃm na colheita de organismos que se alimentam das algas. A carcinicultura depende diretamente da boa qualidade da Ãgua para obter resultados satisfatÃrios de produÃÃo, portanto manter a qualidade do efluente da carcinicultura significa perpetuar a atividade. As macroalgas utilizam os nutrientes absorvidos para seu crescimento, enquanto contribuem com o melhoramento da qualidade ambiental dos ecossitemas aquÃticos. EspÃcies do gÃnero Gracilaria destacam-se pela capacidade de absorver rapidamente grandes quantidades de nutrientes dissolvidos orgÃnicos e inorgÃnicos. Neste trabalho objetivou-se avaliar a remoÃÃo de nutrientes da Ãgua de efluente de carcinicultura por macroalgas marinhas G. birdiae, a fim de fornecer informaÃÃes para um possÃvel cultivo integrado entre as espÃcies Litopenaeus vannamei e Gracilaria birdiae. Para isso, foram utilizados 25 recipientes onde foram distribuÃdos, aleatoriamente, 5 tratamentos com 5 repetiÃÃes, contendo 5, 10, 15 e 20 g de algas em 3 L de Ãgua de efluente de carcinicultura e ainda um controle sem algas. Este procedimento foi realizado com iluminaÃÃo constante e ainda com fotoperÃodo de 12h de claro e escuro, sendo tambÃm verificado a resistÃncia dos animais a situaÃÃo de dÃficit de oxigÃnio e o aporte de nutrientes para a Ãgua de cultivo dos animais. Cada experimento durou duas semanas e os resultados mostraram que a alga G. birdiae tem capacidade de retirar da Ãgua do efluente da carcinicultura em um curto perÃodo de tempo e em quantidades satisfatÃrias amÃnia e fÃsforo e ainda manter, sob iluminaÃÃo, concentraÃÃes suficientes de oxigÃnio na Ãgua.
Among marine resources, seaweeds have emerged as the one which have the largest industrial use. Their abundance and diversity make them a great source of raw material for countless products for human and animal use. More over seaweeds have a widely environmental importance, regarding to the atmospheric O2, water nutrients removing, fossil fuels, and also on the harvest of animals that eat marine algae. Shrimp culture is directly dependent on a good water quality for satisfactory production, therefore maintain the quality of shrimp farms effluent means to perpetuate the activity. Seaweeds absorb nutrients from the water and use them for their growth, while contribute to the environmental improvement of aquatic ecosystems. Gracilaria species stand out for the ability to quickly absorb large amounts of dissolved nutrients, not only organic, but also inorganic nutrients. This study aimed to evaluate the nutrients removal from the effluent water from a shrimp farm by the seaweed G. birdiae, in order to provide information for a possible integrated shrimp (Litopenaeus vannamei) and seaweed (G. birdiae) culture. For this, we used 25 containers, randomly distributed, with five treatments and five replications of 5, 10, 15 and 20 g of seaweed in 3 L of the effluent water from shrimp farm plus a control without seaweed. These procedures were performed with constant illumination and with a 12h light and dark photoperiod. The animals resistance of to periods of low oxygen, and the nutrients input generated by cultured animals have been checked. Each experiment lasted two weeks and the results showed that the alga G. birdiae has the capacity to withdraw from the shrimp farm effluent a satisfactory amount of ammonia and phosphorus in a short period of time, and still maintain, under illumination, sufficient concentrations of oxygen in the water. LISTA DE

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Books on the topic "Macroalgue"

Kim, Se-Kwon, ed. Handbook of Marine Macroalgae. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119977087.

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Lin, Showe-Mei. Marine benthic macroalgal flora of Taiwan. Keelung, Taiwan: National Taiwan Ocean University, 2009.

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W, Lawson George, and Ameka Gabriel K, eds. The marine macroalgae of the tropical West Africa sub-region. Berlin: J. Cramer, 2003.

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Bischoff-Bäsmann, Bettina. Temperaturbedarf und Biogeographie mariner Makroalgen: Anpassung mariner Makroalgen an tiefe Temperaturen = Temperature requirements and biogeography of marine macroalgae : adaptation of marine macroalgae to low temperatures. Bremerhaven: Alfred-Wegener-Institut für Polar- und Meeresforschung, 1997.

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Braithwaite, Richard. Fouling macroalgae and the efficacy of toxic antifouling paints and biocides. Portsmouth: University of Portsmouth, 2003.

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Izaguirre, María Julia Ochoa. Catálogo de macroalgas de las lagunas costeras de Sinaloa. México: Universidad Nacional Autónoma de México, Instituto de Ciencias del Mar y Limnología, 2007.

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Nyberg, Cecilia D. Introduced marine macroalgae and habitat modifiers: Their ecological role and significant attributes. Göteborg: Department of Marine Ecology, Göteborg University, 2007.

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Nyberg, Cecilia D. Introduced marine macroalgae and habitat modifiers: Their ecological role and significant attributes. Göteborg: Department of Marine Ecology, Göteborg University, 2007.

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Nassar, Cristina. Macroalgas marinhas do Brasil: Guia de campo das principais espécies. Rio de Janeiro: Technical Books Editora, 2012.

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Laboratory, Benedict Estuarine Research. Phytoplankton, nutrients, macroalgae, and submerged aquatic vegetation in Delaware's inland bays, 1985-1986. [Dover, DE: The Dept., 1988.

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Book chapters on the topic "Macroalgue"

Kennish, Michael J. "Macroalgae." In Encyclopedia of Estuaries, 387–88. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_9.

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Spalding, Heather L., Gilberto M. Amado-Filho, Ricardo G. Bahia, David L. Ballantine, Suzanne Fredericq, James J. Leichter, Wendy A. Nelson, Marc Slattery, and Roy T. Tsuda. "Macroalgae." In Coral Reefs of the World, 507–36. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-92735-0_29.

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Häder, Donat-P. "Polar Macroalgae." In Aquatic Ecosystems in a Changing Climate, 253–67. Boca Raton, FL : Taylor & Francis Group, [2018] | “A science publishers book.”: CRC Press, 2018. http://dx.doi.org/10.1201/9780429436130-13.

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Häder, Donat-P. "Mid-Latitude Macroalgae." In Aquatic Ecosystems in a Changing Climate, 227–51. Boca Raton, FL : Taylor & Francis Group, [2018] | “A science publishers book.”: CRC Press, 2018. http://dx.doi.org/10.1201/9780429436130-12.

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Day, John G. "Cryopreservation of macroalgae." In Protocols for Macroalgae Research, 79–94. Boca Raton : Taylor & Francis, 2018.: CRC Press, 2018. http://dx.doi.org/10.1201/b21460-4.

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McCarthy, Daniel A., Kenyon C. Lindeman, David B. Snyder, and Karen G. Holloway-Adkins. "Macroalgae and Cyanobacteria." In Islands in the Sand, 47–104. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40357-7_3.

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Chapman, Russell L., J. Craig Bailey, and Debra A. Waters. "Macroalgal Phylogeny." In Molecular Approaches to the Study of the Ocean, 389–407. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-4928-0_20.

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Kennish, Michael J. "Macroalgal Blooms." In Encyclopedia of Estuaries, 388. Dordrecht: Springer Netherlands, 2015. http://dx.doi.org/10.1007/978-94-017-8801-4_10.

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El Gamal, Ali A. "Biological Importance of Marine Algae." In Handbook of Marine Macroalgae, 1–35. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119977087.ch1.

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Jeon, You-Jin, W. A. J. P. Wijesinghe, and Se-Kwon Kim. "Enzyme-assisted Extraction and Recovery of Bioactive Components from Seaweeds." In Handbook of Marine Macroalgae, 221–28. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781119977087.ch10.

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Conference papers on the topic "Macroalgue"

Chen, Ming, Solomon C. Yim, Daniel Cox, Taiping Wang, Michael Huesemann, Zhaoqing Yang, Thomas Mumford, and Geoffrey Wood. "Hydrodynamic Load Modeling for Offshore Free-Floating Macroalgal Aquaculture Under Extreme Environmental Conditions." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96803.

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Abstract This article describes a preliminary study of an on-going ARPA-E (Advanced Research Projects Agency-Energy) MARINER Phase I project. The hydrodynamic load and dynamic response of an innovative offshore macroalgae cultivation system, Nautical Offshore Macroalgal Autonomous Device (NOMAD), under extreme environmental conditions is examined. The high strength, extremely durable, recyclable carbon fiber (rCF) free-floating long-line is applied with polyculture (Nereocystis luetkeana (bull kelp) and Saccharina latissima (sugar kelp)) in the NOMAD system. This novel macroalgal farming system is designed to free float from Washington State to California along the west coast of the US to avoid anchoring costs and the failure of earlier offshore growth trials. In this study, we expect to identify possible failure modes for the preliminarily design of NOMAD free-floating long-line macroalgal farming system based on the preliminary numerical predictions. We developed a 1km system-scale NOMAD free-floating long-line numerical model and performed a dynamic response analysis on the long-line to determine the behaviors of the long-line under extreme environmental conditions. The 1km free-floating rCF long-line responses very flexible due to wave and current activities even for large bending stiffness. Therefore, the potential entanglement of free-floating long-line on a global scale may cause the system failure even when the tensions and bending moments are in the safe range. Three cases include 10m NOMAD free-floating long-line with sugar kelp, bull kelp, and polyculture numerical models are developed, and the simulation results are analyzed. The tensions at the holdfast of the kelps in these cases are found to be below the breakage limit approximately. However, the severe clumping of the kelps and potential entanglement of adjacent lines may result in damage to the farming system.

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SILVA, Vitoria de Souza Fernandes da, Marcia Cristina Campos de OLIVEIRA, Rodrigo Cesar Fernandes BARBOSA, and Marcelo Duarte PONTES. "Avaliação metodologias de extração de Ulvana e composição química do resíduo da extração." In I Simpósio de bolsistas da FIPERJ. Fundação Instituto de Pesca do Estado do Rio de Janeiro - FIPERJ, 2022. http://dx.doi.org/10.57068/simposio.fiperj.334.

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Dentre as macroalgas com potencial de produção para o Rio de Janeiro, o gênero Ulva ocorre naturalmente e possui elevado crescimento e capacidade de filtração da água. A Ulva é geralmente rica em ulvana, polissacarídeo sulfatado que compõe sua parede celular com propriedades geleificante, além de muitas atividades biológicas benéficas, tais como antioxidante e imunomoduladora, despertando o interesse de indústrias dos setores alimentícios e farmacêuticos. A produção de ulvana, pelo seu elevado valor de mercado, pode impulsionar a cadeia de produção desta macroalga. A metodologia tradicional utilizada para extração demanda alta temperatura e pressão, fato que motiva a aplicação de metodologias alternativas que apresentem maior viabilidade ambiental e econômica. Além disso, uma destinação rentável deve ser dada à maior parcela possível da biomassa de ulva produzida. O resíduo da extração tem grande potencial para ser incorporado em dietas para organismos aquáticos, compondo a matriz de ingredientes complementares com produção local. Neste sentido foram avaliadas metodologias de extração da ulvana e a composição do resíduo desta extração. A macroalga coletada apresentou rendimento de 14,08±1,14% de rendimento na produção do farelo de alga. A composição química do farelo foi 84,86% de Matéria seca; 242,8g de de Proteína bruta (Nx6,25)/kg; 211,7g de Proteína bruta corrigida (Nx5,45)/kg; 6,2g de Extrato etéreo/Kg; 216,2g de Matéria mineral/kg; 2,0g de Fósforo total/kg; 41,5g de fibra bruta /kg e energia bruta de 2850 kcal/kg. As metodologias de extração da ulvana testada tiveram influência (p.

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Al-AShwal, Aisha Ahmed, Noora Al-Naimi, Jassim Al-Khayat, Bruno Giraldes, Najat Al-Omari, Noora Al-Fardi, Caesar Sorino, and Ekhlas Abdelbari. "Distribution and Diversity of Benthic Marine Macroalgae in Islands around Qatar." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0052.

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Extending into the Arabian Gulf, Qatar is surrounded by a number of islands mostly scattered by the eastern coastline. With the unique physical characteristics of the Gulf, which is a highly saline sea with high seawater temperatures, there is an urge need to investigate the macroalgae living in such harsh environment. Macroalgae plays an important role in the food web as they are primary producers and providers of food for other organisms. They also provide shelter and habitat in the marine ecosystem for herbivorous fish and other invertebrate animals. Additionally, macroalgae plays an outstanding role in reducing CO2 from the atmosphere and increasing the level of dissolved oxygen in their immediate environment. However, there are few studies on marine macroalgae in Qatar and no previous studies found related to macroalgae from the islands around Qatar. The present work contributes to the macroalgae research by providing the first survey of distribution and diversity of benthic marine macroalgae in islands around Qatar. The marine benthic green, red and brown macroalgae of intertidal and subtidal in marine zone areas around Qatar were collected during Qatar’s Islands project, which started 2018. The collected macroalgae are documented and a total of 67 species of macroalgae are recorded for all islands around Qatar, 24 Chlorophyta (Green algae), 25 Rhodophyta (Red algae) and 18 species Phaeophyta (Brown algae). The Red algae are dominant taxon in term of species richness, accounting for an average of 37% of the species at all study sites. The islands which had more species are Al-Beshaireya 58 Species, Al-Aaliya 53 Species, Sheraouh 48 Species, Janan 43 Species and Bu Felaita 37 Species. Our results show that islands located at eastern and southeastern coast of Qatar have more diversity of algae species than those located at the western and northwestern coast.

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Zhu, Zhe, Saqib Sohail Toor, Lasse Rosendahl, Donghong Yu, and Guanyi Chen. "Experimental Study of Subcritical Water Liquefaction of Biomass: Effects of Catalyst and Biomass Species." In ASME 2014 8th International Conference on Energy Sustainability collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/es2014-6708.

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In this work, hydrothermal liquefaction (HTL) of wood industry residues (wood, bark, sawdust) and macroalgae for producing biofuels has been investigated under subcritical water conditions (at temperature of 300 °C), with and without the presence of a catalyst. The effects of catalyst and biomass type (woody and non-woody) on the biomass conversion, bio-crude yield, and the qualities of products were studied. The results suggested that the addition of potassium carbonate as a catalyst showed a positive effect on bio-crude yield, especially for wood, where it was enhanced to 47.48 wt%. Macroalgae showed a higher biomass conversion and a lower bio-crude yield than other woody biomass investigated in the present study, irrespective of whether the catalyst was used. Meanwhile, the effect of catalyst on macroalgae was less significant than that of woody biomass. The heating values and thermal stability of all bio-crudes were analyzed. The results showed that the higher heating values (HHVs) were in the range of 24.15 to 31.79 MJ/kg, and they were enhanced in the presence of a catalyst, except for that of the macroalgae. The solid residues were characterized by heating value, SEM and FTIR. It was found that the addition of K2CO3 lowered the solids quality in terms of the heating values, while it did not have apparent effect on the functional groups of solid residues. SEM analysis of the raw biomass and solid residues revealed that the char formation for wood, sawdust and macroalgae had initially finished when they were treated in hot compressed water at 300 °C, while conversion of bark had not completed yet.

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Oliveira, Vitoria Argento Huelsen de, ANA CLARA DE QUEIRÓZ, CAROLAYNE SANTINO, INGRID GABRIELA DE ALMEIDA, and ISABELA RODRIGUES ESCOBAR. "COMPARATIVO DA RIQUEZA DE ALGAS DO CAMPUS LAGOA DO SINO, BURI, SÃO PAULO." In II Congresso Brasileiro de Biodiversidade Virtual. Revista Multidisciplinar de Educação e meio ambiente, 2022. http://dx.doi.org/10.51189/ii-conbiv/7154.

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Introdução: Quando se tratando de macroalgas e algas de biofilme, ainda sabe-se pouco e é um tema pouco estudado. Objetivo: Visando a caracterização das espécies de macroalgas presentes no campus Lagoa do Sino, da universidade federal de São Carlos, esse trabalho teve por objetivo analisar quais algas se desenvolviam na região, levando em consideração a teoria do rio contínuo e fatores ambientais. Material e métodos: Dessa forma, para padronização experimental utilizou-se uma superfície de garrafa PET lixada com lixas de construção, de forma a aumentar a aderência e melhorar a fixação vegetal. Colocou-se 24 pedaços de garrafa, e foram distribuídos os pedaços em três trechos de dois riachos (cabeceira, meio e desembocadura), com dois fragmentos em cada trecho, sendo que foram colocados um pedaço próximo a cada uma das margens, os riachos foram chamados de riacho 1 e riacho 2, para facilitar a identificação. Após a coleta utilizou-se o laboratório da universidade, e com o auxílio de lupas, pinças e uma chave de identificação de macroalgas foram feitas as identificações das espécies. Resultados: O que se esperava segundo a literatura era encontrar uma média de sete a oito espécies, ou seja, pelo menos quatorze em cada riacho, mas obteve-se uma média de três espécies de macroalgas. Era esperado também que o riacho 1 tivesse maior riqueza, uma vez que o ambiente é mais iluminado e não sofre interferência de agrotóxicos. Conclusão: Ao final viu-se que, contrariando a teoria do rio contínuo, de modo à encontrar as mesmas espécies ao longo do rio todo, quando comparando os três trechos escolhidos, e também viu-se que o riacho 2 que possuía mais sombra e influência de agrotóxicos possuía maior riqueza de espécies (cinco espécies de macroalgas) quando comparado com o riacho 1 (três espécies de macroalgas).

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Capron, Mark E., Zach Moscicki, Reginald Blaylock, Corey Sullivan, Kelly Lucas, Igor Tsukrov, Michael D. Chambers, et al. "Ocean Forests: Breakthrough Yields for Macroalgae." In OCEANS 2018 MTS/IEEE Charleston. IEEE, 2018. http://dx.doi.org/10.1109/oceans.2018.8604586.

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Daneshvar, Somayeh, Koji Otsuka, Yasuaki Maeda, and Feridoun Salak. "Liquefaction of Green Macroalgae in subcritical ethanol." In 2nd Annual International Conference on Sustainable Energy and Environmental Sciences (SEES 2013). Global Science and Technology Forum, 2013. http://dx.doi.org/10.5176/2301-3761_ccecp.57.

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Bykova, Natalia, Qin Ye, Dmitriy Grazhdankin, and Shuhai Xiao. "MACROALGAE THROUGH PROTEROZOIC: MORPHOLOGICAL AND PALEOECOLOGICAL ANALYSES." In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-316654.

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Szekielda, K. H., J. H. Bowles, D. B. Gillis, W. Snyder, and W. D. Miller. "Patch recognition of algal blooms and macroalgae." In SPIE Defense, Security, and Sensing, edited by Weilin (Will) Hou and Robert A. Arnone. SPIE, 2010. http://dx.doi.org/10.1117/12.854772.

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Markeljić, Kristina, Aleksandra Rakonjac, Nevena Đorđević, Duško Brković, and Snežana Simić. "BENTHIC ALGAE AS BIOINDICATORS IN ASSESSING ECOLOGICAL STATUS OF ČEMERNICA AND DIČINA RIVERS." In 2nd International Symposium on Biotechnology. University of Kragujevac, Faculty of Agronomy, 2024. http://dx.doi.org/10.46793/sbt29.37km.

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This study aimed to assess the ecological status/potential of the Čemernica and Dičina rivers (Zapadna Morava basin) based on epilithic diatoms and supporting physico-chemical parameters, as well as to explore indicative properties of the detected macroalgae. The sampling and analysis of benthic algae and measurement of physico-chemical parameters were carried out in August 2023. The ecological status/potential of the Čemernica River was poor to bad at all investigated sites (ČR1, ČR2, ČR3) based on diatom indices and physico-chemical parameters. Low diatom indices values and the presence of the macroalgae Stigeoclonium tenue indicated organic pollution. In the Dičina River, good ecological status was assessed at all sites (DR1-DR4) based on the diatom indices, while poor ecological status has been assessed at almost all sites (DR1, DR2, DR3) based on the physico-chemical parameters, except at DR4, where the ecological status was good. The high coverage of Cladophora glomerata in both rivers indicated nutrient loading, which aligned with the results of the physico-chemical parameters.

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Reports on the topic "Macroalgue"

Singh, Seema, Chessa Scullin, and Blake Simmons. Deconstruction of Macroalgae. Office of Scientific and Technical Information (OSTI), July 2017. http://dx.doi.org/10.2172/1372639.

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Price, Dean Reid, Johnathon Richard Barbish, Phillip Justin Wolfram, Jr., and Katrina Eleanor Bennet. Assessing Macroalgae Farming Under Climate Change. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1467186.

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Roesijadi, Guritno, Andre M. Coleman, Chaeli Judd, Frances B. Van Cleve, Ronald M. Thom, Kate E. Buenau, Jerry D. Tagestad, Mark S. Wigmosta, and Jeffrey A. Ward. Macroalgae Analysis A National GIS-based Analysis of Macroalgae Production Potential Summary Report and Project Plan. Office of Scientific and Technical Information (OSTI), December 2011. http://dx.doi.org/10.2172/1039854.

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Roesijadi, Guritno, Susanne B. Jones, Lesley J. Snowden-Swan, and Yunhua Zhu. Macroalgae as a Biomass Feedstock: A Preliminary Analysis. Office of Scientific and Technical Information (OSTI), September 2010. http://dx.doi.org/10.2172/1006310.

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Gonzalez Pelayo, Ana. Prospectus for Future Research: Temperature Effects on Green Macroalgae. Portland State University Library, January 2016. http://dx.doi.org/10.15760/honors.288.

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Yang, Zhaoqing, Alicia Gorton, Taiping Wang, Jonathan Whiting, Andrea Copping, Kevin Haas, Phillip Wolfram, and Solomon Yim. Multi-resolution, Multi-scale Modeling for Scalable Macroalgae Production. Office of Scientific and Technical Information (OSTI), May 2020. http://dx.doi.org/10.2172/1642475.

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William Riley Cotton, William Riley Cotton. Economic Valuation of Ecosystem Services Provided by Macroalgae Aquaculture. Experiment, March 2017. http://dx.doi.org/10.18258/9125.

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Rose, Deborah. Life cycle of carbon in macroalgae for various products. Office of Scientific and Technical Information (OSTI), October 2021. http://dx.doi.org/10.2172/1902760.

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Bell, Tom. Integrated Monitoring of Macroalgae Farms Using Acoustics and UUV Sensing. Office of Scientific and Technical Information (OSTI), August 2022. http://dx.doi.org/10.2172/1883237.

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Rocheleau, Greg. Predicting Performance of Macroalgae Farms with Hydrodynamic and Biological Modeling. Office of Scientific and Technical Information (OSTI), February 2022. http://dx.doi.org/10.2172/1846625.

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