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Introduction
N.S. Yokoya currently works at the Nucleo de Pesquisa em Ficologia, Instituto de Botânica, Sao Paulo, Brazil. Professor of the Postgraduate Program in Plant Biodiversity and Environment and advisor of master and doctorate. Member of the editorial board of the Journal of Applied Phycology since 2004. With experience in Botany, acting on the following subjects: physiology, cultivation and biotechnology of marine macroalgae from Brazilian coast and Antarctic and sub-Antarctic regions.
Current institution
Publications
Publications (195)
This study investigated the chemical composition of the Antarctic brown macroalga Desmarestia menziesii , collected from Penguin and Livingston Islands. Sequential extractions using hexane, dichloromethane, ethyl acetate, and methanol were performed, followed by GC-MS, NMR, IR, and mass spectrometry analyses. The hexane extract revealed the presenc...
The red seaweed Kappaphycus alvarezii (Doty) L.M. Liao was introduced in Brazil by Professor Édison José de Paula from São Paulo University, in January 1995. The initial tetrasporophytic segments came from Usa Bay, Shikoku Island, Japan, and were originated from commercial crops carried out in the Philippines. The process of domestication has been...
Ocean acidification has increased due to the enhanced solubility of CO2 in seawater. Mangrove macroalgae in tropical and subtropical coastal regions can benefit from the higher availability of CO2 for photosynthesis and primary production. However, they can be negatively affected by the simultaneously occurring warming and increased salinity in est...
The process of domestication of the seaweed Kappaphycus alvarezii (Doty) L.M. Liao (Rhodophyta) has been taking place since 1995 and 1996 with the introduction of a brown tetrasporophyte and a pale brown gametophyte (originated from tetraspore progeny cultivated in laboratory) in the Experimental Marine Farm of the Fisheries Institute, Ubatuba Bay,...
The use of seaweed extracts as biostimulants is increasing worldwide to improve agricultural production, since they are natural and environmentally friendly compounds. Seaweeds biosynthesize plant hormones, including cytokinins which play an important role in plant growth and development. Cytokinin-like (CK) activity was analysed in eight species o...
Seaweeds play an important role for the environment, since they are photosynthetic organisms, contributing to the cycling of nutrients and to the protection and feeding of several animals. The potential for biotechnological applications of marine macroalgae biomass is enormous, and to attend the demand of the current market, the knowledge of the ph...
Several studies reported that gametophytes and tetrasporophytes of Gigartinaceae produce different carrageenan types, as observed in Sarcopeltis species although they have isomorphic haploid and diploid phases. Cystocarpic and non-fertile plants of Sarcopeltis (ex Gigartina) skottsbergii produced kappa-carrageenans, while tetrasporophytes produced...
The present chapter outlined the current state of knowledge on the taxonomy, ecology, cultivation, and chemical diversity of Brazilian mangrove macroalgae. Brazilian mangrove macroalgal community presents low species diversity estimated in 22 species (15 Rhodophyta and 7 Chlorophyta), dominated by a few genera as Bostrychia, Caloglossa, and Catenel...
Increased greenhouse gas concentrations in the Earth's atmosphere have resulted in global change, such as ocean warming and sea level rise. Increased salinity in estuaries is expected as a result of sea level rise and warming. Thus, we analysed the interactive effects of increased temperature and salinity on multiple physiological responses of Bost...
Increasing oceanic CO 2 has caused a decrease in oceanic pH, a process termed ocean acidification (OA). OA may benefit fleshy macroalgae due to the increased availability of inorganic carbon sources for photosynthesis since they are tolerant of decreases in pH. In this study, we analyzed multiple physiological responses of Bostrychia montagnei and...
Marine heatwaves (MHWs) frequency and intensity are increasing around the globe, affecting marine ecosystems’ structure and functioning. Understanding how key marine species respond to these short-term extreme events is urgent for predicting damage to coastal ecosystems. Hypnea pseudomusciformis presents distribution in different floristic province...
Studies on the effects of temperature on physiological processes are essential to model macroalgae biogeographic distribution. Tetrasporophytes of Hypnea pseudomusciformis were collected from three floristic provinces (tropical, transition and warm temperate) along the Brazilian coast (~3.000 km), representing three ecotypes. Specimens were culture...
Gracilariales is a clade of florideophycean red macroalgae known for being the main source of agar. We present a de novo genome assembly and annotation of Gracilaria domingensis, an agarophyte alga with flattened thallus widely distributed along Central and South American Atlantic intertidal zones. In addition to structural analysis, an organizatio...
The current study is related to the United Nations Sustainable Development Goal 13, "Climate action". As a consequence of environmental variations caused by global climate change, turf-forming algae supposedly tend to replace dominant foundation species, resulting in loss of marine biodiversity. Hypnea brasiliensis, H. cervicornis and H. spinella a...
Laurencia catarinensis (Ceramiales, Rhodomelaceae) has a high diversity of secondary metabolites such as acetogenin and halogenated terpenoids, with biological activities. We tested different combinations of auxins and cytokinins to evaluate their effects on the growth, total soluble proteins, pigments, and carbohydrates of L. catarinensis with the...
Marine ecosystems are subject to several modifications due to anthropogenic impacts, including ocean acidification caused by the absorption of excessive CO2 present in the atmosphere. Perspectives are for dramatic modifications in seawater pH and more than 60% of the ocean surface impacted over the next 100 years by global change. In this study, oc...
The small size (< 5 mm) of marine microfilamentous green algae makes it difficult to identify based on field collections, remaining largely unnoticed. To catalogue the diversity of these diminutive marine algae, a combination of culture-based taxonomic studies and DNA barcoding has proven to be a successful approach. During subtidal surveys in the...
Macroalgae are considered bioindicators for marine pollution, because they have the ability to quickly react to changes in their environment. In consequence, macroalgae populations fluctuate, according to species characteristics and adaptive strategies. Their cell wall polysaccharides contain sulfate groups that are capable of retaining and accumul...
The genus Hypnea (Rhodophyta, Gigartinales) has currently 61 accepted species distributed in tropical, subtropical, and temperate regions, growing in different habitats with a wide range of environmental factors and interactions with abiotic and biotic factors. Some Hypnea species are consumed by humans mostly in Asian and Indo-Pacific countries an...
A small red alga was isolated into culture from rhodoliths collected on the Piauí coast, northeastern Brazil. Molecular data from the plastid-encoded rbcL gene, combined with morphological and ultrastructural evidence, demonstrated that it belongs to the genus Rhodachlya and supports the proposal of a new species, R. westii. The new species was cha...
The seaweed biogeography and diversity in remote areas, such as Antarctica, should be reassessed considering the population shifts induced by global changes. This chapter addresses the hypothesis that ecological isolation can be disrupted and that biogeographical distribution of some species could be altered by thermohaline changes, which in turn w...
Antarctica is characterized by extremes of climate and biogeographic isolation from other continents by distance, high depths, and the Antarctic Circumpolar Current. Even under these harsh conditions, macroalgae thrive in different coastal ecosystems contributing to primary production and serving as habitat and food for a variety of species of mari...
Benthic marine algae, especially Rhodophyta, are within a well-known marine group able to produce secondary metabolites with bioactive properties. Among them are halogenated terpenes, synthesized by vanadium-dependent haloperoxidase (V-BPO). The red alga Ochtodes secundiramea (Montagne) M. Howe produces high amounts of halogenated monoterpenes (HMT...
Extracts of brown algae are used commercially for agricultural crops due to their plant growth-promoting effects and they can also be applied to help improve seaweed cultivation. Gracilaria caudata is commercially exploited as a raw material for agar production in Brazil, and Laurencia catarinensis is a source of halogenated terpenoids with several...
Gracilaria domingensis (Kützing) Sonder ex Dickie is widely distributed in the Brazilian coast and is one of a few Gracilaria species with occurrence in the southern region of the country. Its commercial importance is in the use in human food (in natura) and knowledge of the physiology is fundamental to make its cultivation successful. The objectiv...
Among the red algae, Kappaphycus and Eucheuma are the two most commercially important carrageenophytes farmed extensively in Southeast Asian countries; they rank top in production in terms of volume of raw material produced. The farming of carrageenophytes has emerged as a successful enterprise and provides a promising, alternative livelihood optio...
The present study characterizes the spatial distribution of seaweed diversity on eight islands from the South Shetlands based on an updated taxonomic survey, discussing the higher number of species compared with previous studies and the possible relationships with environmental parameters. Seaweeds were sampled in Deception, Livingston, Halfmoon, R...
Along with the search for new species of seaweeds with biofilter capacity, it is also necessary to understand the physiological and biochemical responses of these seaweeds cultivated in different availabilities of nitrate, ammonium, and phosphate. To accomplish this, a laboratory study was performed to evaluate the ability of Hypnea aspera Kützing...
The red alga Gracilaria caudata J. Agardh (Gracilariales) is commercially exploited in Brazil as a source of raw material for agar production, and its cultivation is needed for sustainable biomass production to avoid overexploitation of natural populations. The objective of the present study was to evaluate the effects of aromatic and isoprenoid-de...
Photosynthesis at high latitudes demands efficient strategies of light utilization to maintain algal fitness and performance. The fitness, and physiological adaptation, of a plant or algae species depends in part on the abundance and efficiency of the pigments it can produce to utilize the light resource from its environment. We quantified pigment...
Dictyota menstrualis (Hoyt) Schnetter, Hörning & Weber-Peukert (Dictyotales, Phaeophyceae) was studied for the production of oil-based bioproducts and co-products. Experiments were performed to evaluate the effect of carbon dioxide (CO2) concentration, under nitrogen (NO3 (-)) limiting and saturation conditions, on growth rate (GR), photosynthesis,...
The Rhodophyta Division is characterized by having representatives of macroalgae with commercial value due to their phycocolloids. Ahnfeltia plicata It is a macroalgae producing agarose and therefore an opportunity for artisanal fisheries and industry. Natural meadows of A. plicata from Skyring Sound (Magellan Region), display yellow and red varian...
Alzheimer's disease affects nearly 36.5 million people worldwide, and acetylcholinesterase inhibition is currently considered the main therapeutic strategy against it. Seaweed biodiversity in Brazil represents one of the most important sources of biologically active compounds for applications in phytotherapy. Accordingly, this study aimed to carry...
Please cite this article in press as: de Felício, R., et al. Antibacterial, antifungal and cytotoxic activities exhibited by endo-phytic fungi from the Brazilian marine red alga Bostrychia tenella (Ceramiales). Revista Brasileira de Farmacognosia (2015), a b s t r a c t Marine environment is one of the most important sources regarding natural produ...
A screening was performed using nine marine-derived fungi as biocatalysts and the natural products (-)-ambrox® (1), (-)-sclareol (2), and (+)-sclareolide (3) in order to select the microorganisms able to catalyze the biooxidation of these compounds. It was observed that only the Aspergillus sydowii CBMAI 934, Botryosphaeria sp., Eutypella sp., and...
The red algal genus Hypnea (Gigartinales) has a wide geographical distribution along tropical and subtropical coasts around the world. The relatively simple and plastic morphology, often influenced by the conditions of its habitat, complicates the identification of Hypnea species. Therefore, the number and status of some species remain in doubt. Mo...
Bioinvasion events causing serious environmental damage have been a concern with the mariculture of Kappaphycus alvarezii (Doty) Doty ex P.C. Silva, suggesting the importance of studying the biological aspects of drifting specimens of K. alvarezii for monitoring programs. The present study aims to evaluate the tolerance and growth of drifting color...
Our understanding of diatoms, one of the most important Antarctic primary producers, is based mostly on investigations of plankton, sea-ice, and sediment samples. Herein, we contribute to the limited research devoted to benthic Antarctic diatoms by presenting a study on epi-phytic diatom communities sampled in two remote Ant-arctic regions: Admiral...
Banana and papaya are among the most important crops in the tropics, amounting millions of dollars per year. Currently, these cultures have significant losses caused by anthracnose, a fungal disease. It is well known that certain seaweed extracts possess antifungal activity but, to our knowledge, in the literature, no data exist on its practical ap...
The macroalga Gracilaria domingensis is an important resource for the food, pharmaceutical, cosmetic, and biotechnology industries. G. domingensis is at a part of the food web foundation, providing nutrients and microelements to upper levels. As seaweed storage metals in the vacuoles, they are considered the main vectors to magnify these toxic elem...
This study describes the diversity of benthic marine algae from insular areas of the southern Brazilian coast. Algal samples were collected between 2006 and 2010 during the winter and the summer seasons at three sites in the coastal waters of Paraná, Brazil: Ilha do Mel, Currais Archipelago and Ilha do Farol. The samples were collected along parall...
The activities of bioactive compounds can be influenced by countless factors, including post-collection sample treatment. In this study, the activities of Ochtodes secundiramea extracts obtained using different processes are compared; the biomass was macerated immediately, lyophilized in liquid nitrogen, or dried in an oven at 50 °C after collectio...
Endophytic and epiphytic infections have caused serious problems for Kappaphycus farmers, such as reduction in biomass production and decrease in the yield and quality of carrageenan. During environmental monitoring from January 2011 to December 2012, along Pitimbu Beach, Paraíba State, northeastern Brazil, drifting thalli of Kappaphycus alvarezii...
Environmental heterogeneity plays a key role in
spatio-temporal distribution of organisms, their ecology and
their evolutionary biology, with their physiological response,
or tolerance to the environment defining their distributional
range. The macroalgae of the sub-Antarctic ecoregion of
Magallanes are subject to a wide range of environments,
resu...
Ahnfeltia plicata (Hudson) E.M. Fries (Rhodophyta,
Ahnfeltiales) is one of the most commercially important
agarophytes in the world for its production of agar that is high
quality and low in sulfate content. In the Magellanic Region, A.
plicata forms extensive beds with high biomass production,
which could be commercially exploited for agar product...
Macroalgae of the genus Gracilaria have considerable economic importance as raw material for agar production and belong to an important group of organisms that are tolerant of high concentrations of metal. The median inhibitory concentration (IC50) values obtained by measuring the ratio of fresh mass variation (i.e., daily growth rates) of the red...
The effects of plant growth regulators and irradiance on growth, callus formation and the process of direct and indirect regeneration were studied in axenic cultures of the green and red morphs of Gracilaria domingensis. Apical and intercalary segments from both color morphs were cultivated in ASP 12-NTA solid medium (0.5% agar) supplemented with a...
This study reports a 48-h aquatic metal-toxicity assay based on daily growth rates of the red seaweed Gracilaria domingensis (Gracilariales, Rhodophyta) in synthetic seawater. The median inhibitory concentration (IC50) for each metal cation was experimentally determined, and the ratios of free ions (aqueous complex) were calculated by software mini...
The selection of seaweed species for their use as biofilters should be based on the knowledge of their nutrient requirements and tolerance to wide variations of nutrient concentrations. Therefore, tolerance and the physiological capabilities of Hypnea cervicornis J. Agardh (Gigartinales, Rhodophyta) to growth under nitrate, ammonium, and phosphate...
We surveyed the distribution and diversity of fungi associated with eight macroalgae from Antarctica and their capability to produce bioactive compounds. The collections yielded 148 fungal isolates, which were identified using molecular methods as belonging to 21 genera and 50 taxa. The most frequent taxa were Geomyces species (sp.), Penicillium sp...
A new species, Gayralia brasiliensis (Ulotrichales, Chlorophyta), is described from Brazil on the basis of ontogenetic, morphological, and molecular phylogenetic data. Liberation of zooids from the monostromatically bladed thalli occurred by disintegration of the zooidan-gium wall, releasing four biflagellate cells with prominent eyespots. Fusion o...
Chondracanthus chamissoi (C. Agardh) Kützing (Gigartinales, Rhodophyta) is an edible species and commercialised for carrageenan production in Chile. Investigations on growth and development are needed to improve its cultivation; therefore, this study aims to evaluate the effects of plant growth regulators (PGRs) on its growth and morphogenesis. PGR...
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This chapter provides an overview of mangrove macroalgal communities of Latin America. Mangroves occur from Mexico to Peru on the Pacific coast covering an area of 19,181 km² and from the Gulf of Mexico down to Brazil comprising an area of 48,195 km² on the Atlantic coast. They are found on fine sediments in estuaries with high water turbidity and...
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