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| Registros recuperados: 369 | |
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| Alves-de-Souza,Catharina; Menezes,Mariângela; Huszar,Vera. |
| This paper presents the composition and functional groups of the phytoplankton from Comprida lagoon, a tropical humic coastal Lagoon located in Southeast Brazil. A total of 28 taxa was found, distributed in eight taxonomic divisions as follows: 26% Heterokontophyta, 21% Chlorophyta, 21% Cyanophyta, 14% Bacillariophyta, 14% Cryptophyta, and 4% Prymnesiophyta. Twenty-three taxa were identified at the specific and infraspecific levels, from which four are new records for Brazil and two for Rio de Janeiro State. Phytoplankton of the Comprida lagoon was comprised of several flagellates, but also eukaryote and prokaryote picoplankton, filamentous cyanobacteria and several diatoms. The biomass was lower than that found in other lacustrine systems, and showed... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytoplankton; Tropics; Humic systems; Coastal lagoons; Functional groups; Southeast Brazil. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062006000300019 |
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| Biolo,Stefania; Bueno,Norma Catarina; Siqueira,Natália Silveira; Moresco,Carina. |
| This work is part of a survey of the desmid flora in a tributary of the Itaipu Reservoir, in the state of Paraná, Brazil. The objective was to expand the knowledge base regarding the genus Cosmarium (Desmidiaceae, Zygnematophyceae). We conducted a qualitative analysis of 60 samples of phytoplankton, which were collected from along the banks of the São Francisco Falso River between July of 2003 and June of 2004. We identified, drew, and described 18 taxa of Cosmarium. Of those 18 taxa, 8 represent new records for the state of Paraná: C. angulosum Bréb. var. angulosum, C. bireme Nordst. var. bireme, C. clepsydra Nordst. var. clepsydra, C. cf. galeritum Nordst. var. borgei, C. ginzbergeri, C. norimbergense Reinsch var. norimbergense, C. protractum (Nägeli) De... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Algae; Desmids; Phytoplankton; Taxonomy. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062013000100001 |
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| Oliveira, Fábio Henrique Portella Corrêa de; Silva, Joanne D'Arc Bezerra da; Costa, Anapaula Nunes Silvestre Fernandes; Ramalho, Waldemir Pimentel; Moreira, César Henrique Pinto; Calazans, Tiago Luiz Santana. |
| This study investigated the effect of seasonality on the Cyanobacteria community in two tropical eutrophic reservoirs in northeastern Brazil. Monthly samplings were conducted in the sub-surface of reservoirs. The following abiotic variables were analyzed: apparent color, turbidity, conductivity, alkalinity, calcium, magnesium, sodium, potassium, sulfate, total phosphorous, ammonia, nitrate, nitrite, chlorides, total hardness and chlorophyll-a, according to APHA (2012). Cyanobacteria density was quantified through biomass. Data were analyzed using one-way ANOVA and Redundancy Analysis (RDA). Higher mean values of Cyanobacteria biomass occurred in the dry (9.9mm3 L-1) and rainy (19.0mm3 L-1) season in Jucazinho and Carpina reservoirs, respectively,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Abiotic parameters; Phytoplankton; Seasonality. |
| Ano: 2015 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/26418 |
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| Echenique,Ricardo; Giannuzzi,Leda; Ferrari,Luis. |
| In April 2000, alterations in drinking water quality, such as turbidity and odors similar to those of organochloride pesticides, were detected at Bahía Blanca (Argentina). This fact was associated to reports of dermic reactions and respiratory problems in the population. Samples drawn from Paso de las Piedras reservoir, two water treatment plants of at inlet and outlet points and at several particular houses were analyzed. Total phytoplankton in the reservoir varied between 49440 and 84832 cells.ml-1, while dominant species was, Anabaena circinalis. Efficiency to remove microorganisms (ER) by the treatment plants considering cell number of total phytoplankton was analyzed. Bacteriological analysis, qualitative and quantitative studies of phytoplankton,... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cyanobacteria; Phytoplankton; Blooms; Biogenic odour compounds. |
| Ano: 2006 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-37432006000200001 |
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| Garcia,Marinês; Odebrecht,Clarisse. |
| The diatom Palmerina hardmaniana (Greville) Hasle presents a wide geographical distribution in neritic tropical and subtropical regions. In the present work we analyzed plankton samples collected monthly between 1995 and 2007 at the surf zone of Cassino Beach, RS (32° 12' S and 52° 10' W), and in winter 2005 and summer 2007 at the continental shelf and slope in southern Brazil, Santa Marta Grande Cape, SC and Albardão-Chuí, RS regions (28° 23'-33° 07' S and 48° 41'-52° 26' W). We present the detailed morphological description of P. hardmaniana, and the first study including electron scanning microscope observations for material from the southwestern Atlantic Ocean. The morphometric data confirm the identity of the species in all its ultra-structural... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Phytoplankton; Seasonal variation; Biogeography; Ultra-structure. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032008000200009 |
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| Lubiana,Karoline Magalhães Ferreira; Dias Júnior,Camilo. |
| Abstract In spite of the length of the Brazilian coastline, studies of marine phytoplankton species in offshore areas have been largely neglected. Regarding phytoplankton species composition, the aim was to assess biodiversity status, species frequency, and the similarities at different sites along the Vitoria-Trindade Seamount Chain. Phytoplankton net samples were analyzed. One hundred and seventy five infrageneric taxa were identified. They represented four phyla, viz., Cyanobacteria, Bacillariophyta, Dinophyta, and Ochrophyta. Dinophyta was the most diverse, and its genus Tripos the largest contributor. This genus also represented more than half of the most common taxa in the sampled area. Thirty-five new infrageneric taxa were recorded, 12 of which are... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: South Atlantic; Tripos; Oceanic islands; Phytoplankton; Biodiversity. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000300206 |
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| Koening,Maria Luise; Leça,Enide Eskinazi; Neumann-Leitão,Sigrid; Macêdo,Silvio José de. |
| In order to address the impact on phytoplankton, sampling was conducted monthly at 4 fixed stations, from April/86 to March/87 at diurnal low and high tide using a plankton net (65 mum mesh size) and a 1 L Van Dorn bottle. Among the 133 taxa identified, marine littoral euryhaline species were most common, outranking Gyrosigma balticum (Ehrenberg) Rabenhorst, Nitzschia sigma (Kützing) Wm. Smith, Licmophora abbreviata Agardh, Climacosphenia moniligera Ehrenberg, Surirella febigerii Lewis, Terpsinoe musica Ehrenberg and Cylindrotheca closterium (Ehrenberg) Reiman and Lewis. The port construction caused significant changes to the phytoplankton community with a strong influence of marine species (mainly dinoflagellate) because of the opening of the reef near... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Phytoplankton; Environmental impacts; Estuary; Suape Port. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132003000100012 |
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| Siqueira,Adriana; Kolm,Hedda Elisabeth; Brandini,Frederico Pereira. |
| Studies were carried out on Thrichodesmium erythraeum occurring on the inner shelf in the state of Paraná, Brazil. Temperature, salinity, rainfall, wind velocity, total bacteria, bacterial biomass, chlorophyll-a, phytoplankton, Anabaena sp., Merismopedia sp. and T. erythraeum densities were measured in surface water. Centric and pennate diatoms, Anabaena sp. and Merismopedia sp. were most abundant at 15 m isobath, while dinoflagellate abundance was relatively constant among stations. Similarly, total bacterial densities were relatively homogeneous throughout the sampling area, suggesting that blooms of T. erythraeum were not yet in the senescent phase. Results showed that T. erythraeum was capable of surviving in relatively inhospitable environmental... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Trichodesmium erythraeum; Bloom; Cyanobacteria; Phytoplankton; South Brazil. |
| Ano: 2006 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000300018 |
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| Registros recuperados: 369 | |
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