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Mariana C. Oliveira
Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of Sao Paulo, Piracicaba, Brazil

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Primary research paper
Published: 21 July 2021 in Hydrobiologia
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Phytoplankton allelopathic studies have mostly been restricted methodologically, leading to very limited quantitative physiological data. In the present study, investigations were carried out to determine physiological changes that occur during allelopathic interactions between chlorophytes (Chlamydomonas reinhardtii P.A. Dangeard 1888; Selenastrum sp.) and cyanobacteria (Microcystis aeruginosa (Kützing) Kützing, Microcystis sp. SR, Anabaena variabilis Kützing ex Bornet & Flahault 1886) using nylon membrane partitioned chambers. The growth of the cyanobacteria and chlorophytes were both stimulated and inhibited in a species-dependent manner. Among the chlorophytes, the Fv/Fm values of Selenastrum were significantly inhibited by Microcystis LE3 and Anabaena UTEX B377 during co-cultivation. There was a significant change in the Fv/Fm values of Anabaena UTEX B377 during co-cultivation with Chlamydomonas CC-503 and Selenastrum. Total microcystins content of Microcystis LE3 significantly declined during co-cultivation with Chlamydomonas CC-503 and Selenastrum. Nitrogen fixation by Anabaena UTEX B377 was significantly lowered in the presence of Microcystis LE3, Microcystis SR, Chlamydomonas CC-503, and Selenastrum. Antioxidant enzyme activities of the investigated chlorophytes and cyanobacteria were altered during allelopathic interactions with each other. These results revealed that phytoplankton species undergo various physiological changes during allelopathic interactions.

ACS Style

Mathias Ahii Chia; Maria Do Carm Bittencourt-Oliveira. Allelopathic interactions between phytoplankton species alter toxin production, oxidative response, and nitrogen fixation. Hydrobiologia 2021, 1 -13.

AMA Style

Mathias Ahii Chia, Maria Do Carm Bittencourt-Oliveira. Allelopathic interactions between phytoplankton species alter toxin production, oxidative response, and nitrogen fixation. Hydrobiologia. 2021; ():1-13.

Chicago/Turabian Style

Mathias Ahii Chia; Maria Do Carm Bittencourt-Oliveira. 2021. "Allelopathic interactions between phytoplankton species alter toxin production, oxidative response, and nitrogen fixation." Hydrobiologia , no. : 1-13.

Research article
Published: 07 June 2021 in Phycologia
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A unique algal bed formation, composed largely of free-living geniculate coralline algae (articuliths), was recorded within the subtidal zone of Arraial do Cabo Bay, Brazil. The importance of these articuliths was shown by previous ecological surveys, which, using morpho-anatomical analyses, identified these algal specimens as belonging to Amphiroa beauvoisii, Jania adhaerens and J. capillacea. Cryptic diversity was recently found in Brazilian corallines and prompted the reassessment of the species diversity of the Arraial do Cabo Bay algal bed. Here we identified the species of geniculate coralline algae commonly associated with the subtidal beds of Arraial do Cabo Bay using a combination of molecular (psbA) and morpho-anatomical analyses, and compared them to closely related species described for Brazil and elsewhere. Two species belonging to the genera Amphiroa and Jania were identified as the major components of these algal beds. Our analyses suggest that these specimens belong to Amphiroa cf. exilis and to a new species of Jania, Jania cabista sp. nov.

ACS Style

Frederico T. S. Tâmega; Beatriz N. Torrano-Silva; Mariana Cabral Oliveira; Paula Spotorno-Oliveira; Sávio H. Calazans; Edgar Francisco Rosas-Alquicira; Ricardo Coutinho; Viviana Peña. Identification of ‘articuliths’ in a unique algal bed formation from Brazil and description of Jania cabista sp. nov. (Corallinales, Rhodophyta). Phycologia 2021, 1 -20.

AMA Style

Frederico T. S. Tâmega, Beatriz N. Torrano-Silva, Mariana Cabral Oliveira, Paula Spotorno-Oliveira, Sávio H. Calazans, Edgar Francisco Rosas-Alquicira, Ricardo Coutinho, Viviana Peña. Identification of ‘articuliths’ in a unique algal bed formation from Brazil and description of Jania cabista sp. nov. (Corallinales, Rhodophyta). Phycologia. 2021; ():1-20.

Chicago/Turabian Style

Frederico T. S. Tâmega; Beatriz N. Torrano-Silva; Mariana Cabral Oliveira; Paula Spotorno-Oliveira; Sávio H. Calazans; Edgar Francisco Rosas-Alquicira; Ricardo Coutinho; Viviana Peña. 2021. "Identification of ‘articuliths’ in a unique algal bed formation from Brazil and description of Jania cabista sp. nov. (Corallinales, Rhodophyta)." Phycologia , no. : 1-20.

Journal article
Published: 09 April 2021 in Phytotaxa
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The Gracilariaceae comprises 242 mainly tropical species, including some with significant economic value for the food and pharmaceutical industry. Accurate taxonomy is crucial for the selection of species for cultivation. However, species identification is still challenging taxonomists. Nineteen species of Gracilariaceae have so far been referred to the Brazilian coast. We describe this diversity across approximately 32 degrees of latitude, using mitochondrial (COI-5P) and plastid (UPA and rbcL) markers in species delimitation analyses (ABGD and SPN). We provide phylogenetic (based on a concatenated three-genes tree and a taxa rich rbcL tree) and barcoding analyses from a broad and partially original collection combined with morphoanatomical data, including information resulting from analyses of type specimens and topotype material. We identified twenty-five specific entities occurring on the Brazilian coast, including four new species yet to be described. Spermatangial arrangements and aspects of thallus morphology were the most useful characters for species and genera delimitation, while characters based on the anatomy of the cystocarp overlap. Our morphological analyses demonstrate the lack of exclusive characters that justify the recently proposed Gracilariaceae infrafamilial categories, and therefore we use in this work the Gracilaria sensu lato genus concept. We provide descriptions, illustrations and a dichotomous key for the identification of species occurring in Brazil.

ACS Style

Goia De Mattos Lyra; José Marcos De Castro Nunes; Edilene Maria Dos Santos Pestana; João Carlos Gama DE Matos; Taiara Aguiar Caires; Priscila Barreto DE Jesus; Emmanuelle Da Silva Costa; Mariana Cabral Oliveira. DIVERSITY OF GRACILARIACEAE (RHODOPHYTA) IN BRAZIL: INTEGRATING MORPHOLOGICAL AND MOLECULAR DATA. Phytotaxa 2021, 496, 1 -53.

AMA Style

Goia De Mattos Lyra, José Marcos De Castro Nunes, Edilene Maria Dos Santos Pestana, João Carlos Gama DE Matos, Taiara Aguiar Caires, Priscila Barreto DE Jesus, Emmanuelle Da Silva Costa, Mariana Cabral Oliveira. DIVERSITY OF GRACILARIACEAE (RHODOPHYTA) IN BRAZIL: INTEGRATING MORPHOLOGICAL AND MOLECULAR DATA. Phytotaxa. 2021; 496 (1):1-53.

Chicago/Turabian Style

Goia De Mattos Lyra; José Marcos De Castro Nunes; Edilene Maria Dos Santos Pestana; João Carlos Gama DE Matos; Taiara Aguiar Caires; Priscila Barreto DE Jesus; Emmanuelle Da Silva Costa; Mariana Cabral Oliveira. 2021. "DIVERSITY OF GRACILARIACEAE (RHODOPHYTA) IN BRAZIL: INTEGRATING MORPHOLOGICAL AND MOLECULAR DATA." Phytotaxa 496, no. 1: 1-53.

Article
Published: 02 November 2020 in Environmental Biology of Fishes
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The red seaweed Hypnea pseudomusciformis has economic potential for mariculture as a source of carrageenan and other products. This work investigates this species along the Brazilian coastline by evaluating the effects of irradiance (40, 70, and 100 μmol photons m−2 s−1) on the number of differentiated branches (Br), growth rates (GR), photosynthesis parameters, and pigment content of tetrasporophytes from five distinct geographical populations extending from 5° to 27° S of latitude. The specimens showed intraspecific divergence for COI-5P marker, divided into three haplotypes with distinct geographical distribution. Although irradiance effects were significant only for GR and Br, intraspecific diversity was significant in all variables analyzed, with the haplotype of the tropical zone (5° to 12° S) displaying higher GR, Br, and maximum quantum yield (Fv/Fm) than the haplotype of the subtropical zone (23° to 27° S), which displayed higher pigment concentration. The geographic intermediate haplotype (19° S) displayed similar GR, Br, and Fv/Fm to the tropical haplotype, but similar pigment content to the subtropical haplotype. Our results indicate the presence of ecotypes within H. pseudomusciformis throughout its geographic distribution. Considering the set of physiological attributes, specimens from the tropical zone have higher potential for mariculture.

ACS Style

Fabio Nauer; Matheus Naves; Estela Maria Plastino; Mariana Cabral Oliveira; Mutue Toyota Fujii. Ecotypes of Hypnea pseudomusciformis (Cystocloniaceae, Rhodophyta) revealed by physiological, morphological, and molecular data. Environmental Biology of Fishes 2020, 32, 4399 -4409.

AMA Style

Fabio Nauer, Matheus Naves, Estela Maria Plastino, Mariana Cabral Oliveira, Mutue Toyota Fujii. Ecotypes of Hypnea pseudomusciformis (Cystocloniaceae, Rhodophyta) revealed by physiological, morphological, and molecular data. Environmental Biology of Fishes. 2020; 32 (6):4399-4409.

Chicago/Turabian Style

Fabio Nauer; Matheus Naves; Estela Maria Plastino; Mariana Cabral Oliveira; Mutue Toyota Fujii. 2020. "Ecotypes of Hypnea pseudomusciformis (Cystocloniaceae, Rhodophyta) revealed by physiological, morphological, and molecular data." Environmental Biology of Fishes 32, no. 6: 4399-4409.

Journal article
Published: 09 October 2020 in Phytotaxa
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The recognition of many species of Sargassum has been difficult because morphological characters show significant phenotypic variation depending on habitat, season, or even differences at the population level. To resolve some of these systematic issues along the Mexican Atlantic coast, molecular analyses of Sargassum species were carried out using DNA sequences of the COI-5P, ITS-2 and rbcL_S genetic markers. Of the 16 species recorded for the area, five species (S. acinarium, S. mathiesonii, S. pteropleuron, S. pusillum and S. ramifolium) were not found during the collections and their status remains undefined. Phylogenetic analyses of the three molecular markers showed that 10 species with their varieties (S. bermudense, S. buxifolium, S. cymosum, S. filipendula, S. fluitans, S. furcatum, S. hystrix, S. natans, S. polyceratium, and S. vulgare) were grouped into a polytomy, with low genetic diversity. If we consider these markers as suitable for proxy for species delimitation, these species should be synonymized under S. cymosum, the older name. Taxonomic independence was confirmed only for S. platycarpum and our data revealed a new morphologically and molecularly independent species within the genus, described here as Sargassum xochitlae.

ACS Style

Donají González-Nieto; Mariana C. Oliveira; María Luisa Núñez Resendiz; Kurt M. Dreckmann; Luz Elena Mateo-Cid; Abel Sentíes. Molecular assessment of the genus Sargassum (Fucales, Phaeophyceae) from the Mexican coasts of the Gulf of Mexico and Caribbean, with the description of S. xochitlae sp. nov. Phytotaxa 2020, 461, 254 -274.

AMA Style

Donají González-Nieto, Mariana C. Oliveira, María Luisa Núñez Resendiz, Kurt M. Dreckmann, Luz Elena Mateo-Cid, Abel Sentíes. Molecular assessment of the genus Sargassum (Fucales, Phaeophyceae) from the Mexican coasts of the Gulf of Mexico and Caribbean, with the description of S. xochitlae sp. nov. Phytotaxa. 2020; 461 (4):254-274.

Chicago/Turabian Style

Donají González-Nieto; Mariana C. Oliveira; María Luisa Núñez Resendiz; Kurt M. Dreckmann; Luz Elena Mateo-Cid; Abel Sentíes. 2020. "Molecular assessment of the genus Sargassum (Fucales, Phaeophyceae) from the Mexican coasts of the Gulf of Mexico and Caribbean, with the description of S. xochitlae sp. nov." Phytotaxa 461, no. 4: 254-274.

Review
Published: 25 August 2020 in Environmental Biology of Fishes
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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 and are also exploited as raw material for kappa-carrageenan production, consequently, have been harvested and/or cultivated in several countries for decades. Hypnea musciformis has the widest geographical distribution around the world and it is the most studied species. However, more molecular studies on H. musciformis from different countries are necessary to understand the phenotypic plasticity and to reveal cryptic species. The present review is a compilation of information on taxonomy, morphology, anatomy, life history, distribution, ecology, physiology, cultivation and harvesting, chemical composition, and biotechnological applications. Although Hypnea species are well known as sources of carrageenans, reports on chemical diversity and biological activities highlight their remarkable potential for biotechnological applications.

ACS Style

Nair S. Yokoya; Fabio Nauer; Mariana C. Oliveira. Concise review of the genus Hypnea J.V.Lamouroux, 1813. Environmental Biology of Fishes 2020, 32, 3585 -3603.

AMA Style

Nair S. Yokoya, Fabio Nauer, Mariana C. Oliveira. Concise review of the genus Hypnea J.V.Lamouroux, 1813. Environmental Biology of Fishes. 2020; 32 (6):3585-3603.

Chicago/Turabian Style

Nair S. Yokoya; Fabio Nauer; Mariana C. Oliveira. 2020. "Concise review of the genus Hypnea J.V.Lamouroux, 1813." Environmental Biology of Fishes 32, no. 6: 3585-3603.

Chapter
Published: 30 April 2020 in Antarctic Seaweeds
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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 marine fauna. However, it is known that the Antarctic marine flora presents low species richness compared to other biogeographical regions: until the past decade a number of 120 Antarctic seaweeds had been reported. On the other hand, long geographical isolation and extreme climatic and oceanographic conditions justify their high degree of endemism (ca. of 33–40%). A new compilation of the Antarctic seaweed diversity is presented in this chapter, reporting a list of 151 species cited to the entire Antarctica, comprising 85 Rhodophyta, 34 Ochrophyta (Phaeophyceae and Chrysophyceae), and 32 Chlorophyta with an endemism degree of 27%, lower than in previous reports. Molecular approaches based on different markers (ITS, UPA, COI-5P) are being used to assist species identification. The collection of marine specimens in Antarctica is expensive and still very difficult, and therefore, the occurrence for many species can become inaccurate. The difficult access to samples is another limitation, which could explain that most of the best known species are concentrated around scientific stations. Consequently, the macroalgal diversity in Antarctica and its distribution is probably underestimated. A better knowledge on this diversity and its distribution is urgent, as the region is facing significant climate changes that may drive shifts on the assemblages of macroalgae.

ACS Style

Mariana C. Oliveira; Franciane Pellizzari; Amanda S. Medeiros; Nair S. Yokoya. Diversity of Antarctic Seaweeds. Antarctic Seaweeds 2020, 23 -42.

AMA Style

Mariana C. Oliveira, Franciane Pellizzari, Amanda S. Medeiros, Nair S. Yokoya. Diversity of Antarctic Seaweeds. Antarctic Seaweeds. 2020; ():23-42.

Chicago/Turabian Style

Mariana C. Oliveira; Franciane Pellizzari; Amanda S. Medeiros; Nair S. Yokoya. 2020. "Diversity of Antarctic Seaweeds." Antarctic Seaweeds , no. : 23-42.

Articles
Published: 07 January 2020 in Phycologia
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Two new Melobesioideae, Tectolithon fluminense gen. et sp. nov. and Crustaphytum atlanticum sp. nov., were described based on specimens collected at depths from 2 to 30 m in a tropical to subtropical transitional region of Southeast Brazil. Analyses of the plastid-encoded markers psbA and rbcL demonstrated that these taxonomic novelties belong to the clade formed by the typically subarctic/arctic Clathromorphum complex. Tectolithon fluminense has tetra/bisporangial and carposporangial conceptacles that typically become buried in the thallus because of an enveloping process caused by the development of a vegetative rim that grows from the margins of the conceptacle. The rim then fuses and creates a vegetative cover. The development of this vegetative cover is described in detail and its possible convergent evolution in other taxa is discussed. Crustaphytum atlanticum differed morpho-anatomically from the generitype, C. pacificum (the only other known species in this genus), by thallus thickness, maximum number of epithallial cell layers, relative size of subepithallial initials and tetra/bisporangial conceptacle chamber dimensions. The observation of specimens from Tectolithon and Crustaphytum with subepithallial initials that are both longer and shorter than their immediate inward derivatives indicates that this morpho-anatomical character should be used with caution for generic delimitation in the Melobesioideae.

ACS Style

Michel B. Jesionek; Ricardo G. Bahia; Manoela B. Lyra; Luis A. B. Leão; Mariana C. Oliveira; Gilberto M. Amado-Filho. Newly discovered coralline algae in Southeast Brazil: Tectolithon fluminense gen. et sp. nov. and Crustaphytum atlanticum sp. nov. (Hapalidiales, Rhodophyta). Phycologia 2020, 59, 101 -115.

AMA Style

Michel B. Jesionek, Ricardo G. Bahia, Manoela B. Lyra, Luis A. B. Leão, Mariana C. Oliveira, Gilberto M. Amado-Filho. Newly discovered coralline algae in Southeast Brazil: Tectolithon fluminense gen. et sp. nov. and Crustaphytum atlanticum sp. nov. (Hapalidiales, Rhodophyta). Phycologia. 2020; 59 (2):101-115.

Chicago/Turabian Style

Michel B. Jesionek; Ricardo G. Bahia; Manoela B. Lyra; Luis A. B. Leão; Mariana C. Oliveira; Gilberto M. Amado-Filho. 2020. "Newly discovered coralline algae in Southeast Brazil: Tectolithon fluminense gen. et sp. nov. and Crustaphytum atlanticum sp. nov. (Hapalidiales, Rhodophyta)." Phycologia 59, no. 2: 101-115.

Review
Published: 30 July 2019 in Brazilian Journal of Botany
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ACS Style

Fabio Nauer; Priscila B. Jesus; Valéria Cassano; José Marcos C. Nunes; Alessandra S. Schnadelbach; Mariana C. Oliveira. A taxonomic review of the genus Hypnea (Gigartinales, Rhodophyta) in Brazil based on DNA barcode and morphology. Brazilian Journal of Botany 2019, 42, 561 -574.

AMA Style

Fabio Nauer, Priscila B. Jesus, Valéria Cassano, José Marcos C. Nunes, Alessandra S. Schnadelbach, Mariana C. Oliveira. A taxonomic review of the genus Hypnea (Gigartinales, Rhodophyta) in Brazil based on DNA barcode and morphology. Brazilian Journal of Botany. 2019; 42 (3):561-574.

Chicago/Turabian Style

Fabio Nauer; Priscila B. Jesus; Valéria Cassano; José Marcos C. Nunes; Alessandra S. Schnadelbach; Mariana C. Oliveira. 2019. "A taxonomic review of the genus Hypnea (Gigartinales, Rhodophyta) in Brazil based on DNA barcode and morphology." Brazilian Journal of Botany 42, no. 3: 561-574.

Journal article
Published: 28 June 2019 in Phytotaxa
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Hypnea musciformis is a red macroalgal species with economic importance as a source for production of carrageenan. Recent phylogeographic studies revealed a hidden diversity of cryptic species, putting in check its cosmopolitan distribution. The DNA barcode marker COI-5P and plastid rbcL, in addition to morphological studies, were used to investigate the species in this complex and to compare them with specimens from other countries including the type locality in Italy. The divergences between sequences within the H. musciformis complex were significantly high for both markers. Based on these analyses two new species are described, Hypnea caraibica Nauer, Cassano & M.C. Oliveira sp. nov. and Hypnea schneideri Nauer, Cassano & M.C. Oliveira sp. nov. Hypnea caraibica seems to be a common, widespread species in the Gulf of Mexico and the Caribbean and was recently introduced into Hawaii. This species was unnoticed due to lack of phylogeographic studies in the region. Hypnea schneideri seems to be more geographically restricted, but further surveys are needed to understand the distribution of this species. Because the identification of Hypnea species is complicated by their relatively simple and plastic morphology, DNA barcoding surveys and other molecular studies are essential to uncover hidden biodiversity in the genus and to supplement traditional studies based on morphology.

ACS Style

Fabio Nauer; Valéria Cassano; Mariana C. Oliveira. Description of two new Caribbean species from the Hypnea musciformis complex (Cystocloniaceae, Rhodophyta). Phytotaxa 2019, 408, 85 -98.

AMA Style

Fabio Nauer, Valéria Cassano, Mariana C. Oliveira. Description of two new Caribbean species from the Hypnea musciformis complex (Cystocloniaceae, Rhodophyta). Phytotaxa. 2019; 408 (2):85-98.

Chicago/Turabian Style

Fabio Nauer; Valéria Cassano; Mariana C. Oliveira. 2019. "Description of two new Caribbean species from the Hypnea musciformis complex (Cystocloniaceae, Rhodophyta)." Phytotaxa 408, no. 2: 85-98.

Article
Published: 22 April 2019 in Journal of Microbiology
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Next-generation DNA sequencing technology was applied to generate molecular data from semiarid reservoirs during well-defined seasons. Target sequences of 16S-23S rRNA ITS and cpcBA-IGS were used to reveal the taxonomic groups of cyanobacteria present in the samples, and genes coding for cyanotoxins such as microcystins (mcyE), saxitoxins (sxtA), and cylindrospermopsins (cyrJ) were investigated. The presence of saxitoxins in the environmental samples was evaluated using ELISA kit. Taxonomic analyses of high-throughput DNA sequencing data showed the dominance of the genus Microcystis in Mundaú reservoir. Furthermore, it was the most abundant genus in the dry season in Ingazeira reservoir. In the rainy season, 16S-23S rRNA ITS analysis revealed that Cylindrospermopsis raciborskii comprised 46.8% of the cyanobacterial community in Ingazeira reservoir, while the cpcBAIGS region revealed that C. raciborskii (31.8%) was the most abundant taxon followed by Sphaerospermopsis aphanizomenoides (17.3%) and Planktothrix zahidii (16.6%). Despite the presence of other potential toxin-producing genera, the detected sxtA gene belonged to C. raciborskii, while the mcyE gene belonged to Microcystis in both reservoirs. The detected mcyE gene had good correlation with MC content, while the amplification of the sxtA gene was related to the presence of STX. The cyrJ gene was not detected in these samples. Using DNA analyses, our results showed that the cyanobacterial composition of Mundaú reservoir was similar in successive dry seasons, and it varied between seasons in Ingazeira reservoir. In addition, our data suggest that some biases of analysis influenced the cyanobacterial communities seen in the NGS output of Ingazeira reservoir.

ACS Style

Adriana Sturion Lorenzi; Mathias Ahii Chia; Fabyano Alvares Cardoso Lopes; Genivaldo Gueiros Z. Silva; Robert Edwards; Maria Do Carmo Bittencourt-Oliveira. Cyanobacterial biodiversity of semiarid public drinking water supply reservoirs assessed via next-generation DNA sequencing technology. Journal of Microbiology 2019, 57, 450 -460.

AMA Style

Adriana Sturion Lorenzi, Mathias Ahii Chia, Fabyano Alvares Cardoso Lopes, Genivaldo Gueiros Z. Silva, Robert Edwards, Maria Do Carmo Bittencourt-Oliveira. Cyanobacterial biodiversity of semiarid public drinking water supply reservoirs assessed via next-generation DNA sequencing technology. Journal of Microbiology. 2019; 57 (6):450-460.

Chicago/Turabian Style

Adriana Sturion Lorenzi; Mathias Ahii Chia; Fabyano Alvares Cardoso Lopes; Genivaldo Gueiros Z. Silva; Robert Edwards; Maria Do Carmo Bittencourt-Oliveira. 2019. "Cyanobacterial biodiversity of semiarid public drinking water supply reservoirs assessed via next-generation DNA sequencing technology." Journal of Microbiology 57, no. 6: 450-460.

Regular article
Published: 22 February 2019 in Journal of Phycology
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Populations of the marine benthic red macroalgae Hypnea musciformis and H. pseudomusciformis along the Atlantic and Pacific Oceans were tested for phylogeographic structure using the DNA barcode COI‐5P combined with rbcL for the construction of the phylogenetic tree. Strong patterns of genetic structure were detected across 210 COI‐5P DNA sequences, and 37 COI‐5P haplotypes were found, using multiple statistical approaches. Hypnea musciformis was found in the Northeast and Northwest Atlantic, the Mediterrean Sea, Namibia, and along the Pacific coast of Mexico. Two new putative species were detected, Hypnea sp. 1 in the Caribbean Sea and Hypnea sp. 2 in the Dominican Republic. For Southern Hemisphere H. pseudomusciformis, three distinct marine phylogeographic provinces were recognized: Uruguay, South‐Southeast Brazil, and Northeast Brazil. The degree of genetic isolation and distinctness among these provinces varied considerably. The Uruguay province was the most genetically distinct, as characterized by four unique haplotypes not shared with any of the Brazilian populations. Statistically significant results support both, isolation by distance and isolation by environment hypotheses, explaining the formation and mantainance of phylogeographic structuring along the Uruguay‐Brazil coast. Geographic, taxonomic and molecular marker concordances were found between our H. pseudomusciformis results and published studies. Furthermore, our data indicate that the Hawaiian introduced populations of Hypnea musciformis contain Hypnea sp. 1 haplotypes, the current known distribution of which is restricted to the Caribbean. This article is protected by copyright. All rights reserved.

ACS Style

Fabio Nauer; Carlos Frederico Deluqui Gurgel; Lígia Maria Ayres‐Ostrock; Estela Maria Plastino; Mariana C Oliveira. Phylogeography of the Hypnea musciformis species complex (Gigartinales, Rhodophyta) with the recognition of cryptic species in the western Atlantic Ocean. Journal of Phycology 2019, 55, 676 -687.

AMA Style

Fabio Nauer, Carlos Frederico Deluqui Gurgel, Lígia Maria Ayres‐Ostrock, Estela Maria Plastino, Mariana C Oliveira. Phylogeography of the Hypnea musciformis species complex (Gigartinales, Rhodophyta) with the recognition of cryptic species in the western Atlantic Ocean. Journal of Phycology. 2019; 55 (3):676-687.

Chicago/Turabian Style

Fabio Nauer; Carlos Frederico Deluqui Gurgel; Lígia Maria Ayres‐Ostrock; Estela Maria Plastino; Mariana C Oliveira. 2019. "Phylogeography of the Hypnea musciformis species complex (Gigartinales, Rhodophyta) with the recognition of cryptic species in the western Atlantic Ocean." Journal of Phycology 55, no. 3: 676-687.

Journal article
Published: 18 January 2019 in Phycologia
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ACS Style

Valéria Cassano; Gabriel Do Nascimento Santos; Edilene Maria Dos Santos Pestana; José Marcos De Castro Nunes; Mariana C. Oliveira; Mutue T. Fujii. Laurencia longiramea sp. nov. for Brazil and an emendation of the generic delineation of Corynecladia (Ceramiales, Rhodophyta). Phycologia 2019, 58, 115 -127.

AMA Style

Valéria Cassano, Gabriel Do Nascimento Santos, Edilene Maria Dos Santos Pestana, José Marcos De Castro Nunes, Mariana C. Oliveira, Mutue T. Fujii. Laurencia longiramea sp. nov. for Brazil and an emendation of the generic delineation of Corynecladia (Ceramiales, Rhodophyta). Phycologia. 2019; 58 (2):115-127.

Chicago/Turabian Style

Valéria Cassano; Gabriel Do Nascimento Santos; Edilene Maria Dos Santos Pestana; José Marcos De Castro Nunes; Mariana C. Oliveira; Mutue T. Fujii. 2019. "Laurencia longiramea sp. nov. for Brazil and an emendation of the generic delineation of Corynecladia (Ceramiales, Rhodophyta)." Phycologia 58, no. 2: 115-127.

Journal article
Published: 15 January 2019 in Toxins
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Globally, eutrophication and warming of aquatic ecosystems has increased the frequency and intensity of cyanobacterial blooms and their associated toxins, with the simultaneous detection of multiple cyanotoxins often occurring. Despite the co-occurrence of cyanotoxins such as microcystins and anatoxin-a (ATX) in water bodies, their effects on phytoplankton communities are poorly understood. The individual and combined effects of microcystin-LR (MC-LR) and ATX on the cyanobacteria Microcystis spp., and Anabaena variabilis (a.k.a. Trichormus variabilis), and the chlorophyte, Selenastrum capricornutum were investigated in the present study. Cell density, chlorophyll-a content, and the maximum quantum efficiency of photosystem II (Fv/Fm) of Microcystis cells were generally lowered after exposure to ATX or MC-LR, while the combined treatment with MC-LR and ATX synergistically reduced the chlorophyll-a concentration of Microcystis strain LE-3. Intracellular levels of microcystin in Microcystis LE-3 significantly increased following exposure to MC-LR + ATX. The maximum quantum efficiency of photosystem II of Anabaena strain UTEX B377 declined during exposure to the cyanotoxins. Nitrogen fixation by Anabaena UTEX B377 was significantly inhibited by exposure to ATX, but was unaffected by MC-LR. In contrast, the combination of both cyanotoxins (MC-LR + ATX) caused a synergistic increase in the growth of S. capricornutum. While the toxins caused an increase in the activity of enzymes that scavenge reactive oxygen species in cyanobacteria, enzyme activity was unchanged or decreased in S. capricornutum. Collectively this study demonstrates that MC-LR and ATX can selectively promote and inhibit the growth and performance of green algae and cyanobacteria, respectively, and that the combined effect of these cyanotoxins was often more intense than their individual effects on some strains. This suggests that the release of multiple cyanotoxins in aquatic ecosystems, following the collapse of blooms, may influence the succession of plankton communities.

ACS Style

Mathias Ahii Chia; Benjamin J. Kramer; Jennifer G. Jankowiak; Maria Do Carmo Bittencourt-Oliveira; Christopher J. Gobler. The Individual and Combined Effects of the Cyanotoxins, Anatoxin-a and Microcystin-LR, on the Growth, Toxin Production, and Nitrogen Fixation of Prokaryotic and Eukaryotic Algae. Toxins 2019, 11, 43 .

AMA Style

Mathias Ahii Chia, Benjamin J. Kramer, Jennifer G. Jankowiak, Maria Do Carmo Bittencourt-Oliveira, Christopher J. Gobler. The Individual and Combined Effects of the Cyanotoxins, Anatoxin-a and Microcystin-LR, on the Growth, Toxin Production, and Nitrogen Fixation of Prokaryotic and Eukaryotic Algae. Toxins. 2019; 11 (1):43.

Chicago/Turabian Style

Mathias Ahii Chia; Benjamin J. Kramer; Jennifer G. Jankowiak; Maria Do Carmo Bittencourt-Oliveira; Christopher J. Gobler. 2019. "The Individual and Combined Effects of the Cyanotoxins, Anatoxin-a and Microcystin-LR, on the Growth, Toxin Production, and Nitrogen Fixation of Prokaryotic and Eukaryotic Algae." Toxins 11, no. 1: 43.

Original article
Published: 10 October 2018 in Brazilian Journal of Botany
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Based on morphological studies, four species of Chondracanthus Kützing were previously reported on the Brazilian coast: C. acicularis (Roth) Fredericq, C. elegans (Greville) Guiry, C. saundersii C.W.Schneider and C.E.Lane and C. teedei (Mertens ex Roth) Fredericq. In the present study, specimens of Chondracanthus were collected from intertidal and subtidal zones (up to 18 m depth); morphological, molecular and phylogenetic analyses were performed using DNA barcoding (cox1) as a tool in a survey of Rhodophyta biodiversity in São Paulo state. Unlike what we expected, C. saundersii is widely distributed, and many specimens were misidentified as C. acicularis or C. teedei before this study, suggesting the necessity of an accurate revision in the previous identifications of the species of Chondracanthus in Brazil. Tetrasporangial and cystocarpic structures of C. saundersii are described for the first time. Our results confirm that the utilization of cox1 sequences as DNA barcode is an efficient tool to complement morphological identification for species of the genus Chondracanthus.

ACS Style

Renato Rocha-Jorge; Fabio Nauer; Ingrid B. Silva; Mutue Fujii; Orlando Necchi Jr.; Line Le Gall; Mariana C Oliveira. Diversity of Chondracanthus (Gigartinaceae, Rhodophyta) on the Brazilian coast based on molecular and morphological evidences. Brazilian Journal of Botany 2018, 41, 889 -900.

AMA Style

Renato Rocha-Jorge, Fabio Nauer, Ingrid B. Silva, Mutue Fujii, Orlando Necchi Jr., Line Le Gall, Mariana C Oliveira. Diversity of Chondracanthus (Gigartinaceae, Rhodophyta) on the Brazilian coast based on molecular and morphological evidences. Brazilian Journal of Botany. 2018; 41 (4):889-900.

Chicago/Turabian Style

Renato Rocha-Jorge; Fabio Nauer; Ingrid B. Silva; Mutue Fujii; Orlando Necchi Jr.; Line Le Gall; Mariana C Oliveira. 2018. "Diversity of Chondracanthus (Gigartinaceae, Rhodophyta) on the Brazilian coast based on molecular and morphological evidences." Brazilian Journal of Botany 41, no. 4: 889-900.

Article
Published: 15 September 2018 in Environmental Biology of Fishes
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Specimens previously described as Hypnea musciformis and Hypnea nigrescens in Brazil were shown to be morphological variants of a new species named Hypnea pseudomusciformis, which has been used for the production of carrageenan on the coast of Brazil. In this study, individuals of both morphological variants were collected in the field and cultivated in unialgal culture conditions. The life history of both variants was completed in 118 days. Tetrasporophytes produced tetrasporangia in 40 days. Released tetraspores germinated and 15 days later, an erect cylindrical axis developed from basal disk. At the age of 35 days, spermatangial conceptacles could be observed, and after 3 days of co-culture of male and female gametophytes, cystocarps could be observed, indicating the occurrence of fertilization. Finally, carpospores were released from cystocarps after 10 days, germinated and originated new tetrasporophytes in 15 days. When cultured, the morphological differences between the “musciformis” and “nigrescens” variants were attenuated and the life histories were the same. Furthermore, both morphological variants had different growth rates, but similar pigment content. These results corroborate that, for Brazil, specimens previously identified as H. musciformis and H. nigrescens are variants of H. pseudomusciformis, a highly plastic species.

ACS Style

Fábio Nauer; Lígia Maria Ayres-Ostrock; Ana Maria Amorim; Janaína Pires Santos; Fungyi Chow; Estela Plastino; Mariana C Oliveira. Life history, growth, and pigment content of two morphological variants of Hypnea pseudomusciformis (Gigartinales, Rhodophyta). Environmental Biology of Fishes 2018, 31, 1271 -1284.

AMA Style

Fábio Nauer, Lígia Maria Ayres-Ostrock, Ana Maria Amorim, Janaína Pires Santos, Fungyi Chow, Estela Plastino, Mariana C Oliveira. Life history, growth, and pigment content of two morphological variants of Hypnea pseudomusciformis (Gigartinales, Rhodophyta). Environmental Biology of Fishes. 2018; 31 (2):1271-1284.

Chicago/Turabian Style

Fábio Nauer; Lígia Maria Ayres-Ostrock; Ana Maria Amorim; Janaína Pires Santos; Fungyi Chow; Estela Plastino; Mariana C Oliveira. 2018. "Life history, growth, and pigment content of two morphological variants of Hypnea pseudomusciformis (Gigartinales, Rhodophyta)." Environmental Biology of Fishes 31, no. 2: 1271-1284.

Original article
Published: 27 August 2018 in Environmental Earth Sciences
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Changing global climatic conditions and the continuous eutrophication of aquatic ecosystems have led to increased frequency, duration and toxicity of cyanobacterial blooms worldwide. This makes the provision of time series information on cyanotoxins extremely crucial for effective monitoring and management of water resources. The objective of the present study was to investigate seasonal and annual changes in microcystins (MCs), cylindrospermopsins (CYNs), saxitoxins (STXs), neo-saxitoxin (neo-STX) and anatoxin-a (ATX-a) concentrations in 11 public water supply reservoirs in the semiarid region of Brazil, from 2004 to 2011. Per time, at least one cyanotoxin was present in all the investigated reservoirs. High levels of MCs, CYNs, STXs and Neo-STX were detected simultaneously in Carpina, Duas Unas, Ipojuca, and Jucazinho reservoirs. All the investigated reservoirs had significant concentrations of MCs. The highest levels of MCs were found in Carpina (303,300.0 ng g−1) and Duas Unas (122,053.9 ng g−1) reservoirs, while the lowest concentration of the hepatotoxins was recorded in Ipojuca (10.3 ng g−1) reservoir. On the other hand, CYN was detected in four reservoirs, STXs and Neo-STX in ten reservoirs and ATX-a in two reservoirs. The first record of CYN in Carpina reservoir was obtained in 2006. In addition, Carpina reservoir had the highest concentration of STXs and Neo-STX in the dry and rainy seasons, respectively. The high concentration of cyanotoxins observed in most samples obtained from semiarid reservoirs in Brazil demonstrates the need for regular monitoring and updated management programs.

ACS Style

Adriana Sturion Lorenzi; Micheline Kézia Cordeiro-Araújo; Mathias Ahii Chia; Maria Do Carmo Bittencourt-Oliveira. Cyanotoxin contamination of semiarid drinking water supply reservoirs. Environmental Earth Sciences 2018, 77, 595 .

AMA Style

Adriana Sturion Lorenzi, Micheline Kézia Cordeiro-Araújo, Mathias Ahii Chia, Maria Do Carmo Bittencourt-Oliveira. Cyanotoxin contamination of semiarid drinking water supply reservoirs. Environmental Earth Sciences. 2018; 77 (16):595.

Chicago/Turabian Style

Adriana Sturion Lorenzi; Micheline Kézia Cordeiro-Araújo; Mathias Ahii Chia; Maria Do Carmo Bittencourt-Oliveira. 2018. "Cyanotoxin contamination of semiarid drinking water supply reservoirs." Environmental Earth Sciences 77, no. 16: 595.

Original article
Published: 23 July 2018 in Brazilian Journal of Botany
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Hypnea pseudomusciformis Nauer, Cassano and M.C. Oliveira, a morphologically plastic species used as carrageenan source in Brazil, was recently described based on molecular markers. Two species previously described for the Brazilian coast (H. musciformis (Wulfen) J.V. Lamouroux and H. nigrescens Greville ex J. Agardh) are currently considered morphological variations of H. pseudomusciformis that are found in different intertidal regions. In this work, we investigated whether this morphologically plastic species also present physiological plasticity related to the different morphologies. The content of photosynthetic pigments (chlorophyll a, carotenoids and phycobiliproteins), total soluble proteins and antioxidant capacity (DPPH, ABTS, Folin–Ciocalteu reductive capacity, FRAP and iron chelating capacity) were analyzed for samples of the two morphological variations collected directly from the field or grown in culture. Physiological differences between the two morphological variants from field samples were observed for phycoerythrin, total soluble protein and for all the antioxidant assays, with the exception of DPPH. While between cultured samples, differences were found for phycocyanin, phycoerythrin and total soluble proteins. Overall, the two morphological variants have a similar physiological behavior when grown under the same culture conditions, corroborating its classification under one species. These results indicate that the physiological differences found between these variants are mostly due to environmental pressures and represent an example of phenotypic plasticity, which allows the occurrence of this species in different environments and may lead to different morphologies in the field.

ACS Style

Fábio Nauer; Ana Maria Amorim; Janaína Pires Santos; Fungyi Chow; Mariana C Oliveira. Physiological plasticity in morphological variations of red seaweed Hypnea pseudomusciformis (Gigartinales, Rhodophyta) uncovered by molecular, antioxidant capacity and pigments content data. Brazilian Journal of Botany 2018, 41, 567 -577.

AMA Style

Fábio Nauer, Ana Maria Amorim, Janaína Pires Santos, Fungyi Chow, Mariana C Oliveira. Physiological plasticity in morphological variations of red seaweed Hypnea pseudomusciformis (Gigartinales, Rhodophyta) uncovered by molecular, antioxidant capacity and pigments content data. Brazilian Journal of Botany. 2018; 41 (3):567-577.

Chicago/Turabian Style

Fábio Nauer; Ana Maria Amorim; Janaína Pires Santos; Fungyi Chow; Mariana C Oliveira. 2018. "Physiological plasticity in morphological variations of red seaweed Hypnea pseudomusciformis (Gigartinales, Rhodophyta) uncovered by molecular, antioxidant capacity and pigments content data." Brazilian Journal of Botany 41, no. 3: 567-577.

Regular article
Published: 10 July 2018 in Journal of Phycology
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Gracilariaceae has a worldwide distribution including numerous economically important species. We applied high‐throughput sequencing to obtain organellar genomes (mitochondria and chloroplast) from ten species of Gracilariaceae and, combined with published genomes, to infer phylogenies and compare genome architecture among species representing main lineages. We obtained similar topologies between chloroplast and mitochondrial genomes phylogenies. However, the chloroplast phylogeny was better resolved with full support. In this phylogeny, Melanthalia intermedia is sister to a monophyletic clade including Gracilaria and Gracilariopsis, which were both resolved as monophyletic genera. Mitochondrial and chloroplast genomes were highly conserved in gene synteny, and variation mainly occurred in regions where insertions of plasmid‐derived sequences (PDS) were found. In mitochondrial genomes, PDS insertions were observed in two regions where the transcription direction changes: between the genes cob and trnL, and trnA and trnN. In chloroplast genomes, PDS insertions were in different positions, but generally found between psdD and rrs genes. Gracilariaceae is a good model system to study the impact of PDS in genome evolution due to the frequent presence of these insertions in organellar genomes. Furthermore, the bacterial leuC/leuD operon was found in chloroplast genomes of Gracilaria tenuistipitata, G. chilensis, and M. intermedia, and in extrachromosomal plasmid of G. vermiculophylla. Phylogenetic trees show two different origins of leuC/leuD: genes found in chloroplast and plasmid were placed with proteobacteria, and genes encoded in the nucleus were close to Viridiplantae and cyanobacteria. This article is protected by copyright. All rights reserved.

ACS Style

Cintia Iha; Christopher J. Grassa; Goia De M. Lyra; Charles C. Davis; Heroen Verbruggen; Mariana C. Oliveira. Organellar genomics: a useful tool to study evolutionary relationships and molecular evolution in Gracilariaceae (Rhodophyta). Journal of Phycology 2018, 54, 775 -787.

AMA Style

Cintia Iha, Christopher J. Grassa, Goia De M. Lyra, Charles C. Davis, Heroen Verbruggen, Mariana C. Oliveira. Organellar genomics: a useful tool to study evolutionary relationships and molecular evolution in Gracilariaceae (Rhodophyta). Journal of Phycology. 2018; 54 (6):775-787.

Chicago/Turabian Style

Cintia Iha; Christopher J. Grassa; Goia De M. Lyra; Charles C. Davis; Heroen Verbruggen; Mariana C. Oliveira. 2018. "Organellar genomics: a useful tool to study evolutionary relationships and molecular evolution in Gracilariaceae (Rhodophyta)." Journal of Phycology 54, no. 6: 775-787.

Journal article
Published: 18 April 2018 in European Journal of Phycology
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Mariana C. Oliveira; Sonja Repetti; Cintia Iha; Christopher J. Jackson; Pilar Díaz-Tapia; Karoline Magalhães Ferreira Lubiana; Valéria Cassano; Joana F. Costa; Ma. Chiela M. Cremen; Vanessa R. Marcelino; Heroen Verbruggen. High-throughput sequencing for algal systematics. European Journal of Phycology 2018, 53, 256 -272.

AMA Style

Mariana C. Oliveira, Sonja Repetti, Cintia Iha, Christopher J. Jackson, Pilar Díaz-Tapia, Karoline Magalhães Ferreira Lubiana, Valéria Cassano, Joana F. Costa, Ma. Chiela M. Cremen, Vanessa R. Marcelino, Heroen Verbruggen. High-throughput sequencing for algal systematics. European Journal of Phycology. 2018; 53 (3):256-272.

Chicago/Turabian Style

Mariana C. Oliveira; Sonja Repetti; Cintia Iha; Christopher J. Jackson; Pilar Díaz-Tapia; Karoline Magalhães Ferreira Lubiana; Valéria Cassano; Joana F. Costa; Ma. Chiela M. Cremen; Vanessa R. Marcelino; Heroen Verbruggen. 2018. "High-throughput sequencing for algal systematics." European Journal of Phycology 53, no. 3: 256-272.