Production of the Copepod Pseudodiaptomus forbesi Is Not Enhanced by Ingestion of the Diatom Aulacoseira granulata During a Bloom

2020 ◽  
Author(s):  
Michelle Jungbluth ◽  
Calvin Lee ◽  
Cheryl Patel ◽  
Toni Ignoffo ◽  
Brian Bergamaschi ◽  
...  
Keyword(s):  
Aulacoseira Granulata

scholarly journals Phytoplankton community of a polymictic reservoir, La Plata River basin, Uruguay

1999 ◽  
Vol 59 (4) ◽  
pp. 535-541 ◽  
Author(s):  
M. C. PÉREZ ◽  
S. BONILLA ◽  
G. MARTÍNEZ
Keyword(s):  
Spatial Heterogeneity ◽  
River Basin ◽  
Phytoplankton Community ◽  
Water Reservoir ◽  
Phytoplankton Composition ◽  
Phytoplankton Abundance ◽  
La Plata ◽  
Phytoplankton Distribution ◽  
Aulacoseira Granulata

This paper deals with the analysis of phytoplankton composition and abundance from four sampling stations at the polymictic system, Rincón del Bonete water reservoir in Uruguay. Sampling data were obtained in 4 seasonal periods between February and November 1993. A hundred and twenty-four taxa were identified, where Aulacoseira granulata (Ehrenb.) Simon., A. granulata var. angustissima (Muller) Simon., A. granulata var. angustissima f. spiralis, (Muller) Simon., A. cf. ambigua, (Grun.) Simon., A. cf.. distans (Ehrenb.) Simon., Cryptomonas spp. and Synedra ulna (Nitzsch) Ehrenberg, were always present. Phytoplankton abundance fluctuated between 29 (autumn) and 2129 (summer) ind/ml. The general dominance of Aulacoseira spp. could be related to the polymictic condition of the system. In cold months phytoplankton distribution was homogeneous among sampling stations, while in warm months, spatial heterogeneity was detected, suggesting that sampling stations can behave as independent compartments.

scholarly journals Oxygen uptake during mineralization of photosynthesized carbon from phytoplankton of the Barra Bonita Reservoir: a mesocosm study

2008 ◽  
Vol 68 (1) ◽  
pp. 115-122 ◽  
Author(s):  
MB. Cunha-Santino ◽  
SP. Gouvêa ◽  
I. Bianchini Jr ◽  
AAH. Vieira
Keyword(s):  
Electrical Conductivity ◽  
Oxygen Consumption ◽  
Oxygen Uptake ◽  
Dissolved Oxygen ◽  
Water Samples ◽  
Microbial Respiration ◽  
Co2 Concentration ◽  
Ph Values ◽  
Organic Products ◽  
Aulacoseira Granulata

This study aimed to discuss and describe the oxygen consumption during aerobic mineralization of organic products (cells and excretion products) from five unialgal cultures: Cryptomonas sp., Microcystis aeruginosa, Anabaena spiroides, Thalassiosira sp. and Aulacoseira granulata. These species were isolated from Barra Bonita reservoir (22º 29’ S and 48º 34’ W) and cultivated in the laboratory. From each culture, two decomposition chambers were prepared; each chamber contained about 130 mg.L-1 of carbon from water samples of the reservoir. The chambers were aerated and incubated in the dark at 20.0 ºC. The concentration of dissolved oxygen, pH values and electrical conductivity of the solutions were determined during a period of 10 days. The results indicated increases in oxygen consumption for all the solutions studied and also for electrical conductivity. The pH values presented a decreasing tendency throughout the experiment. Oxygen consumption varied from 43 (Aulacoseira granulata chamber) to 345 mg O2 g-1 C (Anabaena spiroides chamber). Decrease in pH values was probably due to increase in CO2 concentration from microbial respiration. Increase in electrical conductivity might be due to the liberation of ions during decomposition. The results demonstrate the potentiality of the studied genera in influencing oxygen availability followed by a die-off event. It also indicates the possibility of changing of the electrical conductivity and pH values in the water column due the aerobic algae mineralization.

scholarly journals Monitoramento do fitoplâncton na água bruta da ETA Macapá e inferências sobre a covid-19

2021 ◽  
Vol 12 (3) ◽  
pp. 664-678
Author(s):  
Elcliane Da Costa Cavalcante ◽  
Silvia Maria Mathes Faustino ◽  
Luís Maurício Abdon da Silva ◽  
Alan Cavalcanti da Cunha ◽  
Elane Domênica Cunha de Oliveira
Keyword(s):  
Aulacoseira Granulata

O fitoplâncton é formado por microalgas e cianobactérias, fornecedores de oxigênio para o meio aquático. Em ecossistemas desequilibrados esses organismos podem se multiplicar e produzir toxinas que afetam a saúde humana e animal. Este estudo teve como objetivo identificar padrões de densidade no fitoplâncton da água bruta da ETAm e relacionar a influência de fatores físicos, químicos e ambientais sobre a densidade das espécies. As amostragens foram realizadas entre maio de 2019 e agosto de 2020 (exceto em março-maio/2020, devido ao isolamento social). Foram identificados 86 táxons: Bacillariophyta (45), Cyanophyta (18), Chlorophyta (10), Charophyta (10), Dinophyta (1), Euglenophyta (1) e Rhodophyta (1), sendo as cianobactérias e diatomáceas os grupos mais abundantes. E as espécies mais abundantes foram Aulacoseira granulata e Limnothrix planctonica, respectivamente. Em relação à densidade de cianobactérias, observou-se que há padrão de aumento no período maio-agosto similar aos anos anteriores (2015-2016). Porém a densidade de cianobactérias observada neste estudo em 2019 (7083,2 cels. mL-1) foi 7x maior que em anos anteriores (1090 cels.mL-1 em 2015), todavia ainda estão em conformidade com os padrões estabelecidos pelo Ministério da Saúde (<10.000 cels.mL-1). Em junho e julho de 2020, quando era esperado o pico de cianobactérias, ocorreu queda expressiva na densidade. Pode-se inferir que isto ocorreu pela relação entre o aumento do isolamento social em Macapá e a diminuição da abundância de cianobactérias observada neste período de 2020 (R2= 0,94). Quanto à influência dos parâmetros ambientais, a transparência da água foi o parâmetro com maior influência na densidade de cianobactérias.

scholarly journals A Rapid Growth of Aulacoseira granulata (Bacillariophyceae) during the Typhoon Season in the South Basin of Lake Biwa

1996 ◽  
Vol 57 (4-2) ◽  
pp. 493-500 ◽  
Author(s):  
Shin-ichi NAKANO ◽  
Yasushi SEIKE ◽  
Tatsuki SEKINO ◽  
Minoru OKUMURA ◽  
Keiichi KAWABATA ◽  
...  
Keyword(s):  
Rapid Growth ◽  
Lake Biwa ◽  
The South ◽  
South Basin ◽  
Typhoon Season ◽  
Aulacoseira Granulata

scholarly journals Algal flora of Rajarani Lake, Dhankuta and their seasonal distribution

Our Nature ◽  
2017 ◽  
Vol 15 (1-2) ◽  
pp. 44-54
Author(s):  
Govinda Shrestha ◽  
Shiva Kumar Rai
Keyword(s):  
Seasonal Variation ◽  
Rainy Season ◽  
Physicochemical Parameters ◽  
Winter Season ◽  
Single Species ◽  
Seasonal Distribution ◽  
Algal Flora ◽  
Ankistrodesmus Falcatus ◽  
Different Seasons ◽  
Aulacoseira Granulata

In this paper, a total 46 algae belonging to 34 genera and 3 classes (Chlorophyceae 54%, Bacillariophyceae 28%, Cyanophyceae 18%) have been reported from Rajarani Lake, Dhankuta, Nepal. Among these, 13 algae were reported as new to the country. Genera Ankistrodesmus, Closterium, and Desmodesmus had maximum number of species whereas 25 genera were represented by single species. Seasonal variation of algae showed that there was changing number and type of algae with physicochemical parameters in different seasons. Cyanophycean algae Microcystis flos-aque was dominant and observed in all sites in every collection of winter, summer and rainy seasons, and followed by bacillariophyceaean algae i.e., Aulacoseira granulata var. angustissima. The maximum number of algae was found in summer (59%) followed by winter (50%) and rainy (31%) seasons. There were 6 common algae found in all season’s viz. Ankistrodesmus falcatus, Aulacoseira granulata var. angustissima, Flagilaria tenera, Microcystis flos-aquae, Navicula radiosa and Oedogonium sp. Algae viz., Anabaena affinis, Cyclotella meneghiana, Pinnularia divergens, Pinnularia interrupta, Tetrastrum heteracanthum, and Ulothrix subtilissima were found only in winter season whereas, Aulacoseirsa granulata var. muzzanensis, Bolbochaete sp, Closterium striolatum, Cylindrospermum muscicola, Desmodesmus abundans, Desmodesmous quadricauda var.bicaudatus, Eunotia bilunaris, Gomphonema lacusrankaloides and Gomphonema pseudoaugur were observed only in summer. Similarly, Aphanocapsa pulchra, Oscillatoria sancta and Pediastrum duplex var. gracillimum were reported only in rainy season.

ASSEMBLÉIAS MICROFITOPLANCTÔNICAS NUM LAGO URBANO DA CIDADE DE CURITIBA (ESTADO DO PARANÁ, BRASIL)

2007 ◽  
Vol 29 (66) ◽  
Author(s):  
Gilmar Perbiche-Neves ◽  
Mateus Ferrareze ◽  
André Ricardo Ghidini ◽  
Lineu de Brito ◽  
Madalena Tomi Shirata
Keyword(s):  
Microcystis Aeruginosa ◽  
Scenedesmus Quadricauda ◽  
Aulacoseira Granulata

O lago artificial do Parque Passeio Público tem sido submetido a grandes descargas de nutrientes, que associado à baixa profundidade e ao longo tempo de residência da água, contribuiu para a ocorrência de florações de fitoplâncton. O principal objetivo deste estudo foi analisar a variabilidade sazonal da estrutura das assembléias microfitoplanctônicas (composição e dominância) num lago urbano de Curitiba(PR). Os dados foram obtidos mensalmente, entre agosto/2002 a julho/2003, em quatro pontos de amostragem. O número total de táxons identificados foi vinte e nove. Houve predominância de Chlorococcaceae (17 taxa), seguido de Cyanophyceae (6 taxa) e Coscinodiscophyceae (4 taxa). As espécies com maior ocorrência, em ordem decrescente, foram: Scenedesmus quadricauda, Golenkinia radiata, Microcystis aeruginosa, Pediastrum duplex var. boryanum, Kirchneriella lunaris, Staurastrum paradoxum, Micractinium pusillum,Aulacoseira granulata, Lagerheimia ciliata e Sphaerocystis schroeteri. O estudo conclui que a comunidade fitoplanctônica responde às variações ambientais no lago, espacial e temporalmente.

scholarly journals Cryoseston of the Pirin Mountains, Bulgaria

2013 ◽  
Vol 72 (2) ◽  
pp. 257-268 ◽  
Author(s):  
Vladislav Cepák ◽  
Jaromír Lukavský
Keyword(s):  
New Genus ◽  
Pollen Grains ◽  
Rhodosporidium Toruloides ◽  
High Mountains ◽  
New Genus And Species ◽  
Alternaria Sp ◽  
Aulacoseira Granulata

Abstract - In the cryoseston community of the Pirin Mountains, 18 species were determined. Chlorophyta: Chlamydomonas nivalis (predominant), Chloromonas brevispina, Chloromonas rostafinski, Chlainomonas rubra (new genus and species for Bulgaria, documented in Europe for only the second time), Cystococcus nivicolus and Stichococcus nivalis. Bacillariophyceae: Aulacoseira granulata var. angustissima, Hantzchia amphioxys, cf. Surirella. Fungi: cf. Chytridium chlamydococcii. Deuteromycetes: Selenotila nivalis, Chionaster nivalis, and saprophytic fungae cf. Myzocytium, Rhodosporidium toruloides, Alternaria sp. and cf. Cladosporium, in pollen grains. Bacteria: Leptothrix ochracea. Ciliata: Vorticella campanula. The composition of cryoseston in the Pirin Mountains is characteristic for high mountains where Chlamydomonas nivalis predominates.

Morphological observations of Aulacoseira using scanning electron microscopy

1997 ◽  
Vol 75 (11) ◽  
pp. 1807-1835 ◽  
Author(s):  
Peter A. Siver ◽  
Hedy Kling
Keyword(s):  
Current Literature ◽  
Common Species ◽  
Additional Source ◽  
Common Component ◽  
Phytoplankton Communities ◽  
Central Canada ◽  
Morphological Detail ◽  
Aulacoseira Granulata ◽  
Scanning Electron ◽  
Made In

Despite the fact that the genus Aulacoseira Thwaites is a common component of phytoplankton communities in many North American water bodies, there are relatively few taxonomic based surveys utilizing the scanning electron microscope (SEM). In addition, based on the current literature, some species are difficult to identify or distinguish from other taxa. We present taxonomic and morphological observations on 19 taxa based primarily on collections made in Connecticut, U.S.A., and from central and northern Canada. Aulacoseira ambigua (Grunow) Simonsen, Aulacoseira subarctica (O. Müller) Haworth, and Aulacoseira tenella (Nygaard) Simonsen were the most common species encountered in Connecticut, while Aulacoseira islandica (O. Müller) Simonsen, Aulacoseira granulata (Ehrenberg) Simonsen, A. subarctica, and A. ambigua were the dominant species from many central Canada localities. In the Canadian Shield region, specimens of the Aulacoseira disions (Ehrenberg) Simonsen group, the Aulacoseira lirata (Ehrenberg) Ross in Hartley group, and Aulacoseira perglabra (Oestrup) Haworth were more common. We had the most difficulty identifying taxa in the A. distorts and A. perglabra complexes and distinguishing A. lirata from Aulacoseira alpigena (Grunow) Krammer. The primary objectives of the paper were to provide an additional source of high-resolution SEM micrographs for many of the more common species of Aulacoseira, comment on the morphological detail of each taxon, and to discuss the difficulties we encountered using the current literature to identify some of the species. A few ecological observations are also provided. Lastly, we propose two new combinations, Aulacoseira pseudoamericana (Camburn) comb.nov. and Aulacoseira distans var. nivaloides (Camburn) comb.nov. Key words: diatoms, Aulacoseira, North America, taxonomy, morphology.

scholarly journals Influência da variação do nível hidrométrico na comunidade fitoplanctônica do Rio Paranapanema e de uma lagoa marginal na zona de desembocadura na Represa de Jurumirim (SP)

Hoehnea ◽  
2009 ◽  
Vol 36 (1) ◽  
pp. 113-129 ◽  
Author(s):  
Danielli Cristina Granado ◽  
Raoul Henry ◽  
Andréa Tucci
Keyword(s):  
Aulacoseira Granulata

Este estudo visou analisar os efeitos da variação do nível hidrométrico na estrutura do fitoplâncton do Rio Paranapanema e de uma lagoa marginal na zona de desembocadura no Reservatório de Jurumirim (SP). As amostragens foram realizadas em duas estações em cada ambiente de julho/2004 a julho/2005. Os maiores valores de riqueza e diversidade foram encontrados na estiagem, enquanto que as maiores densidade e biovolume foram registradas na cheia. A espécie Cryptomonas brasiliensis Castro, C. Bicudo & D. Bicudo (R - estrategista) foi constante ao longo de todo o estudo, sendo dominante, principalmente, no final da estiagem e na enchente, quando os eventos de distúrbios foram mais freqüentes. As diatomáceas foram predominantes quanto à biomassa, representadas, principalmente, por Aulacoseira granulata (Ehrenberg) Simonsem e suas variedades. Conclui-se que, o volume de água acumulada no reservatório à jusante não permite que o pulso hidrológico ocasione um distúrbio que resulte em elevado aumento da diversidade nos ambientes estudados, após a enchente.

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