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Registros recuperados: 10
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Biodiversidade e considerações biogeográficas das Cyanobacteria de uma área de Manguezal do Estado de Pernambuco, Brasil Acta Botanica
Branco,Luis Henrique Zanini; Moura,Ariadne do Nascimento; Silva,Adriana Cristina da; Bittencourt-Oliveira,Maria do Carmo.
Manguezais caracterizam-se por apresentarem amplas variações ambientais (principalmente de salinidade, irradiância e teor de oxigênio) e possuírem substrato relativamente instável, o que exige adaptações específicas dos organismos para habitar com sucesso este ambiente. O presente estudo procura, principalmente, contribuir com o conhecimento da biodiversidade, através da realização do levantamento da flora de cianobactérias habitantes de Manguezais do Estado de Pernambuco. Foram realizadas amostragens quinzenais em quatro pontos distintos do Manguezal do rio Paripe, entre agosto e dezembro/1998, totalizando 27 amostras coletadas. A identificação das principais cianobactérias componentes das comunidades revelou a presença de 16 espécies, distribuídas em 11...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; Mangue; Levantamento taxonômico; Biogeografia; Pernambuco.
Ano: 2003 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062003000400010
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Biomonitoring of microcystin and aflatoxin co-occurrence in aquaculture using immunohistochemistry and genotoxicity assays BABT
Hashimoto,Elisabete Hiromi; Kamogae,Márcia; Vanzella,Tatiana Perez; Cólus,Ilce Mara Syllus; Bracarense,Ana Paula Frederico Rodrigues Lourenço; Bittencourt-Oliveira,Maria do Carmo; Itano,Eiko; Kuroda,Emília Kiyomi; Kato,Hajime; Nagata,Satoshi; Ueno,Yoshio; Harada,Ken-Ichi; Hirooka,Elisa Yoko.
This work investigated the effects of co-occurring aflatoxin B1 (AFB1) and microcystin (MC) in aquaculture, using immunohistochemistry and genotoxicity methods. Tilapia (Oreochromis niloticus) were exposed to AFB1 by intraperitoneal and MC (cell extract of Microcystis aeruginosa) by intraperitoneal and immersion routes. The interaction of MC-AFB1 was evaluated co-exposing the intraperitoneal doses. Blood samples were collected after 8, 24, and 48h to analyze the micronucleus frequency and comet score. The interaction of MC-AFB1 showed a synergic mutagenic response by higher micronucleus frequency of co-exposed group. A slight genotoxic synergism was also observed in the comet score. Immunohistochemistry detected MC in al lthe fish liver tissues exposed to...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Microcystis aeruginosa; Mycotoxin and tilapia.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000100019
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Cyanobacterial blooms in stratified and destratified eutrophic reservoirs in semi-arid region of Brazil Anais da ABC (AABC)
Dantas,Ênio W.; Moura,Ariadne N.; Bittencourt-Oliveira,Maria do Carmo.
This study investigated the dynamics of cyanobacteria in two deep, eutrophic reservoirs in a semi-arid region of Brazil during periods of stratification and destratification. Four collections were carried out at each reservoir at two depths at three-month intervals. The following abiotic variables were analyzed: water temperature, dissolved oxygen, pH, turbidity, water transparency, total phosphorus, total dissolved phosphorus, orthophosphate and total nitrogen. Phytoplankton density was quantified for the determination of the biomass of cyanobacteria. The data were analyzed using CCA. Higher mean phytoplankton biomass values (29.8 mm³.L-1) occurred in the period of thermal stratification. A greater similarity in the phytoplankton communities also occurred...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomass; Cylindrospermopsis raciborskii; Seasonal dynaics; Theral pattern.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000400019
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Efeito das variáveis abióticas e do fitoplâncton sobre a comunidade zooplanctônica em um reservatório do Nordeste brasileiro Iheringia, Sér. Zool.
Dantas,Ênio W.; Almeida,Viviane L. dos S.; Barbosa,José E. de L.; Bittencourt-Oliveira,Maria do Carmo; Moura,Ariadne do N..
O zooplâncton do reservatório de Mundaú, Pernambuco, nordeste do Brasil foi estudado quanto a variabilidade temporal (entre os horários e períodos seco chuvoso) e espacial (nas regiões pelágica e litorânea em diferentes profundidades) correlacionando-as com as variáveis ambientais e com o fitoplâncton. Vinte e três táxons infragenéricos e cinco subgenéricos de zooplâncton foram encontrados. De forma geral, Rotifera foi o grupo dominante em todo o estudo. O fitoplâncton foi dominado pelas cianobactérias. No período seco, as variáveis físicas certamente controlaram o desenvolvimento do zooplâncton, favorecendo o estabelecimento de elevadas densidades algais. No período chuvoso, a correlação do zooplâncton com os níveis de nutrientes do sistema na região...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dinâmica; Comunidade zooplanctônica; Reservatório; Nordeste do Brasil.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212009000200003
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Genetic polymorphism in brazilian microcystis spp. (Cyanobacteria) toxic and non-toxic through RFLP-PCR of the cpcBA-IGS BABT
Bittencourt-Oliveira,Maria do Carmo; Cunha,Maristela Casé Costa; Moura,Ariadne do Nascimento.
The escalating occurrence of cyanobacterial toxic blooms demands a better understanding of genetic variability as an auxiliary expedient in species identification, collaborating with the monitoring of water destined to public supply. This study aimed at the unraveling of genetic polymorphism in the toxic and nontoxic strains of Microcystis (Cyanobacteria) species, isolated from diverse Brazilian localities through the RFLP-PCR technique applied to the c-phycocyanin encoding operon and its intergenic spacer (cpcBA-IGS). Eighteen strains belonging to M. aeruginosa, M. panniformis, M. protocystis and M. wesenbergii, plus two other unidentified strains, were analyzed by means of the morphological and molecular data. The molecular data constituted three groups...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cyanobacteria; CpcBA-IGS; Genetic polymorphism; Microcystin; Microcystis; RFLP.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000400014
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Phytoplanktonic associations: a tool to understanding dominance events in a tropical Brazilian reservoir Acta Botanica
Moura,Ariadne do Nascimento; Bittencourt-Oliveira,Maria do Carmo; Dantas,Ênio Wocyli; Arruda Neto,João Dias de Toledo.
The aim of this study was to characterize phytoplankton associations, as well as discuss controlling factors determining algal dominance in a eutrophic tropical reservoir, Mundaú, Pernambuco, Brazil. Water samples were collected during the dry period (January/2005) and the rainy period (June/2005). The samples were collected from both limnetic and littoral regions, and the phytoplankton assemblages identified from current literature after preservation in formaldehyde 4%. At the same time as sampling was done, in situ measurements of water temperature, transparency, dissolved oxygen, and pH were also taken. Total phosphorus, total nitrogen concentration and the Trophic State Index were subsequently determined in the laboratory. Phytoplankton density (ind....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Phytoplankton associations; Drinking water reservoirs; Northeast Brazil.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062007000300011
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Spatial-temporal variation in coiled and straight morphotypes of Cylindrospermopsis raciborskii (Wolsz) Seenayya et Subba Raju (Cyanobacteria) Acta Botanica
Dantas,Ênio Wocyli; Bittencourt-Oliveira,Maria do Carmo; Moura,Ariadne do Nascimento.
This study reports the spatial and temporal behavior of straight and coiled morphotypes of C. raciborskii in a reservoir in Brazil's semi-arid region as well as the main factors responsible for the variability. Two set of samples were collected from the subsurface and bottom in the central region of a reservoir in two seasonal periods (dry - January 2005; rainy - June 2005) over 20-hour sampling periods during daylight (8 am, 12 pm and 4 pm) and dark (8 pm, 12 am and 4 am) hours. Measurements of abiotic parameters were determined concurrently to the sampling of biotic variables. Two C. raciborskii morphotypes were found in the reservoir: straight and coiled. There was no difference in density of the straight and coiled C. raciborskii morphotypes between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cylindrospermopsis raciborskii; Semi-arid; Diel variation; Vertical variation.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062010000200028
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Structure and dynamics of phytoplankton community in the Botafogo reservoir-Pernambuco-Brazil BABT
Lira,Giulliari Alan da Silva Tavares de; Bittencourt-Oliveira,Maria do Carmo; Moura,Ariadne do Nascimento.
The aim of the present study was to investigate the structure and dynamics of the phytoplankton in the Botafogo reservoir-PE-Brazil. Phytoplankton assemblages were identified from current literature and density was estimated using an inverted microscope. Concurrently to the sampling of biotic variables, measurements of abiotic parameters, such as water temperature, dissolved oxygen and pH, were determined using field probes and transparency was determined with a Secchi disk. Total phosphorus and total nitrogen concentrations were determined in laboratory. A total of 24 taxa were identified. Chlorophyta presented the greatest number of species. Species diversity in the reservoir was low throughout the study period. Principal component analysis revealed that...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Structure; Tropical reservoir; Phytoplankton; Brazil.
Ano: 2009 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132009000200029
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Structure of the phytoplankton in a water supply system in the State of Pernambuco - Brazil BABT
Moura,Ariadne do Nascimento; Dantas,Ênio Wocyli; Bittencourt-Oliveira,Maria do Carmo.
The aim of this work was to study the phytoplankton community composition at limnetic environment in Pernambuco, Brazil. Samplings were carried out from April/2001 to March/2002. Samples to analyses the biotic variables were taken using a recipient with a large overture, at the subsurface and with a Van Dorn bottle at the bottom. The rainfall data were recorded and the water transparency was used to calculate the light attenuation coefficient, photic zone and the determination of trophic state index. The concentrations of total phosphorus and total nitrogen were determined in a typical dry and rainy month. Equitability, also the, similarity and diversity indexes and the densities and correlation of total densities among depths were calculated. Forty-five...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Structure; Phytoplankton; Water supply system; Brazil.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000400010
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Temporal variation of the phytoplankton community at short sampling intervals in the Mundaú reservoir, Northeastern Brazil Acta Botanica
Dantas,Ênio Wocyli; Moura,Ariadne do Nascimento; Bittencourt-Oliveira,Maria do Carmo; Arruda Neto,João Dias de Toledo; Cavalcanti,Airlton de Deus C..
The aim of this study was to determine how abiotic factors drive the phytoplankton community in a water supply reservoir within short sampling intervals. Samples were collected at the subsurface (0.1 m) and bottom of limnetic (8 m) and littoral (2 m) zones in both the dry and rainy seasons. The following abiotic variables were analyzed: water temperature, dissolved oxygen, electrical conductivity, total dissolved solids, turbidity, pH, total nitrogen, nitrite, nitrate, total phosphorus, total dissolved phosphorus and orthophosphate. Phytoplankton biomass was determined from biovolume values. The role abiotic variables play in the dynamics of phytoplankton species was determined by means of Canonical Correspondence Analysis. Algae biomass ranged from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cylindrospermopsis raciborskii; Eutrophication; Nutrients; Water supply reservoir.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062008000400008
Registros recuperados: 10
Primeira ... 1 ... Última
 

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