Técnica para el estudio de las diatomeas

Müller-Melchers, F. C.; Ferrando, Hugo J.

doi:10.1590/s0373-55241956000100009

Cited by 11 publications

(9 citation statements)

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“…A identificação dos táxons de diatomáceas foi realizada através da observação de lâminas permanentes montadas segundo Müller-Melchers & Ferrando (1956) e através de imagens obtidas por intermédio de um Microscópio Eletrônico de Varredura (MEV) LEO, modelo 1450 VP.…”

Section: Methodsunclassified

Microfitoplâncton de águas costeiras amazônicas: Ilha Canela (Bragança, PA, Brasil)

et al. 2008

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RESUMO -(Microfitoplâncton de águas costeiras amazônicas: Ilha Canela (Bragança, PA, Brasil)). Variações sazonal e nictemeral do microfitoplâncton foram estudadas em uma estação fixa (00º46'37,2''S-046º43'24,5''W), localizada em uma área costeira próxima à ilha Canela (Norte do Brasil), durante os meses de setembro e dezembro/2004 (período seco) e março e junho/2005 (período chuvoso). As amostras destinadas à análise qualitativa do fitoplâncton foram obtidas a partir da filtragem de 400 L de água, através de uma rede planctônica (65 µm de abertura de malha), durante marés de sizígia, em intervalos regulares de três horas, por um período de 24 horas. O material coletado foi fixado com formol neutro a 4%. Paralelamente a essas coletas foi medida a salinidade da superfície da água. A salinidade apresentou variação significativa ao longo do período de estudo, variando entre 26,1 (junho/2005) e 39,0 (dezembro/2004), caracterizando o ambiente como eualino-polialino. Foram identificados 130 táxons incluídos nas divisões Cyanophyta (dois táxons), Bacillariophyta (115 táxons) e Dinophyta (13 táxons). As diatomáceas dominaram o microfitoplâncton da área, sendo Asterionellopsis glacialis, Dimeregramma minor, Skeletonema sp. e Thalassiosira subtilis os táxons mais freqüentes e abundantes. Os altos valores de salinidade condicionaram a maior representatividade das espécies marinhas neríticas, polialóbias. Os processos de ressuspensão provocados pelos ventos e arrebentação das ondas promoveram intercâmbios entre as populações planctônicas e ticoplanctônicas, dentre as quais as espécies Dimeregramma minor, Triceratium biquadratum e T. pentacrinus representaram novas ocorrências para as águas costeiras do litoral amazônico. Palavras-chave: fitoplâncton, composição, Ilha Canela, costa amazônicaABSTRACT -(Microphytoplankton of Amazon coastal waters: Canela Island (Bragança, Pará State, Brazil)). Seasonal and nyctemeral variations of the microphytoplankton were studied at a fixed station (00º46'37.2''S-046º43'24.5''W) on Canela Island (North Brazil) in September and December/2004 (dry season) and in March and June/2005 (rainy season). Samples for qualitative phytoplankton studies were obtained by filtering 400 L of surface water in the surf zone of the island through plankton nets (65 µm mesh size). Field work was carried out during spring tides and samples were collected every 3 hours during a 24-hour period. The collected material was fixed in neutral formaldehyde at 4%. Simultaneously, salinity of the water surface was also measured. Salinity showed significant variation throughout the study period, ranging from 26.1 (June/2005) to 39.0 (December/2004), characterizing the environment as euhalinepolyhaline. A total of 130 taxa were identified, belonging to Cyanophyta (two taxa), Bacillariophyta (115 taxa) and Dinophyta (13 taxa). Diatoms were the dominant group of microphytoplankton at Canela Island. Asterionellopsis glacialis, Dimeregramma minor, Skeletonema sp. and Thalassiosira subtilis were the most frequent and abundant tax...

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Section: Methodsunclassified

Microfitoplâncton de águas costeiras amazônicas: Ilha Canela (Bragança, PA, Brasil)

et al. 2008

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“…For this analysis, subsamples of 0.5 ml were observed under a Bausch & Lomb binocular microscope. Permanent slides were made for confirmation of diatom species (Muller-Melchers & Ferrando, 1956). Microalgae identification and diatom nomenclature followed (Desikachary, 1959;Prescott, 1975;Tomas, 1997;Hasle, 1983;Lange et al, 1992;Round et al, 1990).…”

Section: Methodsmentioning

confidence: 99%

Phytoplankton nyctemeral variation at a tropical river estuary (Itamaracá - Pernambuco - Brazil)

et al. 2004

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The Botafogo estuary is of socio-economical importance for Pernambuco State. It is located at the north of Santa Cruz Channel, Itamaracá, Pernambuco, Brazil (07 o 42'50"S and 34 o 52'10"W). There is a critical need to understand its functioning because of the rate at which this area is being converted to land uses. The phytoplankton dynamics was studied to enhance the knowledge of and verify the possible changes which have occurred in this ecosystem. Sampling was carried out with a plankton net 65 micrometers mesh size for qualitative data, and a Van Dorn bottle for quantitative data. Concurrent hydrological and chlorophyll-a data were collected. Samplings were made in one fixed station in July 1996 (rainy season) and December 1996 (dry season), at 3-hour intervals during 24 hours. Eighty-seven specific and infra-specific taxa were identified from net plankton samples. Diatoms were most frequent, mainly Coscinodiscus centralis and Odontella regia in the rainy and dry seasons, respectively. Phytoplankton density varied from 205,000 to 1,210,000 cell.L -1 in the dry season, and from 230,000 to 2,510,000 cell.L -1 in the rainy season, indicating eutrophic conditions. Most numerically abundant were the diatoms Cyclotella meneghiniana and Cylindrotheca closterium and the phytoflagellates. The ecosystem is polluted, and deleterious effects are minimized by the marine influence which allows periodic water renewal.Key words: estuarine phytoplankton, nyctemeral variation, tropical. RESUMO

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“…The samples were stored in plastic bottles and kept with buffered formalin 4%. In the laboratory, the identification was made through mounting of temporary and permanent slides (MÜLLER-MELCHERS; FERRANDO, 1956), using the recommended bibliography. For classification and updating of the taxa the website AlgaeBase was used (http://www.algaebase.…”

Section: Phytoplankton Compositionmentioning

confidence: 99%

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

et al. 2017

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Duarte-dos-Santos et al.: Spatial-seasonal variation of microphytoplankton 356 Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary -Maranhão -BrazilThe Bacanga River Estuary has a hydrodynamic behavior and its tidal flow is limited by a dam. It is considered as a hypertrophic environment that receives daily high loads of domestic sewage without treatment. This study aimed to evaluate the spatial and temporal variation of phytoplankton community and its relationship with environmental parameters. Bi-monthly sampling campaigns were carried out at six fixed sites between 2012 and 2013. Physical-chemical and biological parameters were collected (chlorophyll a, phytoplankton composition and abundance) to perform the statistical correlations. The results indicate that phytoplankton community is mostly represented by diatoms, with Skeletonema costatum being the dominant species responsible for bloom in April and June of 2012. The dominance of this species is related to the high silicate concentrations, pH and turbidity. Other blooms events as well as the Euglena gracilis and Chlamydomonas sp. were recorded in February 2013, when the total phosphorus concentrations were high and the dissolved oxygen concentrations were higher. Dinoflagellates, cyanobacteria and diatom Thallassiosira sp. were widely distributed in the dry period and highly correlated with salinity, water transparency and nutrients. Hence, the distribution of phytoplankton community is more defined seasonally, rather than spatially. AbstrActDescriptors: Algal bloom, Microalgae, Nutrients.O estuário do rio Bacanga apresenta um comportamento hidrodinâmico com fluxo de marés limitado por uma barragem. Ele é considerado como um ambiente hipereutrófico que recebe diariamente altas cargas de esgoto doméstico sem tratamento. Este trabalho teve como objetivo avaliar a variação espaço-sazonal da comunidade fitoplanctônica e suas relações com parâmetros ambientais. Amostragens bimestrais foram realizadas em seis pontos fixos entre 2012 e 2013, obtendo valores dos parâmetros físico-químicos e biológicos (clorofila a, composição e abundância do fitoplâncton) para realização das análises estatísticas. Os resultados indicam que a comunidade fitoplanctônica é representada por diatomáceas, sendo Skeletonema costatum a espécie dominante responsável por pulsos de florações em abril e junho de 2012. O predomínio dessa espécie está relacionado aos elevados teores de silicato, pH e turbidez da água. Outros eventos de florações como da Euglena gracilis e Chlamydomonas sp. foram registrados em fevereiro de 2013, quando os teores de fósforo total estiveram elevados e as taxas de oxigênio dissolvido foram superiores. Os dinoflagelados, cianobactérias e a diatomácea Thallassiosira sp. apresentaram ampla distribuição no período de estiagem e estão altamente correlacionados com a salinidade, transparência da água e nutrientes. Desta forma, a distribuição da comunidade fitoplanctônica é ...

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Técnica para el estudio de las diatomeas

Cited by 11 publications

References 0 publications

Microfitoplâncton de águas costeiras amazônicas: Ilha Canela (Bragança, PA, Brasil)

Microfitoplâncton de águas costeiras amazônicas: Ilha Canela (Bragança, PA, Brasil)

Phytoplankton nyctemeral variation at a tropical river estuary (Itamaracá - Pernambuco - Brazil)

Spatial and seasonal variation of microphytoplankton community and the correlation with environmental parameters in a hypereutrophic tropical estuary - Maranhão - Brazil

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