Cianobactérias perifíticas em dois ambientes lênticos da planície de inundação do alto Rio Paraná, PR, Brasil

Fonseca, Iraúza Arroteia; Rodrigues, Liliana

doi:10.1590/s0100-84042005000400016

Cited by 5 publications

(8 citation statements)

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“…According to Fonseca and Rodrigues (2005b) greater presence of cyanobacteria in the rainy season is related to different levels of features present in this period, as higher concentrations of nitrate and ammonium. In addition, Fernandes et al (2009) reported that the toleration of cyanobacteria to high temperatures associated to its ability to utilize nitrogen forms make them extremely competitive compared to other groups of algae favoring its prevalence.…”

Section: Discussionmentioning

confidence: 99%

Periphytic algae dynamics in lentic ecosystems in the Brazilian semiarid

et al. 2016

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The hydrological periods drive the structure and organization of aquatic communities in semiarid regions. We hypothesize that a decrease of the precipitation during the dry period will favor the development of the periphytic algal community, leading to higher richness and density in this period. To test this hypothesis, we investigated the changes in the periphytic algal community structure in three shallow and eutrophic ecosystems of the Brazilian semiarid. The sampling was performed between 2007 and 2010 at two-mensal intervals. The sampling of periphytic algal was performed in aquatic macrophytes and rocks. The abiotic variables were analyzed simultaneously. Dominance in diatoms, cyanobacteria and chlorophytes, respectively, was observed in two periods. In the dry period, waters were alkaline and had high concentrations of nitrate and total phosphorus associated with the highest densities of Bacillariophyceae. In the rainy period the water was warmer, oxygenated and high concentrations of ammonia and soluble reactive phosphorus with diatoms remained dominant but with reduced density, while cyanobacteria and chlorophytes increased. Overall, periphytic algal community composition no responded to changes in the hydrological periods. However, the hydrological periods altered the dynamics of periphytic algal community, supported by the alternation of the most representative classes (diatoms and cyanobacteria) between the hydrologic periods. Our data suggest that the morphometric and chemical and physical characteristics of lentic aquatic ecosystems studied were more important in the dynamics of periphytic algal community than the hydrological periods and types of substrates.Keywords: seasonality, reservoirs, lentic aquatic ecosystems, periphyton. Estrutura da comunidade de algas perifíticas do semiárido brasileiro ResumoOs períodos hidrológicos impulsionam a estrutura e organização das comunidades aquáticas em regiões semiáridas. Nós hipotetizamos que uma diminuição da precipitação durante o período seco irá favorecer o desenvolvimento da comunidade de algas perifíticas, levando a uma maior riqueza e densidade nesse período. Para testar esta hipótese, nós investigamos as mudanças na estrutura da comunidade de algas perifíticas em três ecossistemas rasos e eutróficos do semiárido brasileiro. As amostragens foram realizadas entre 2007 e 2010 em intervalos de bimensais. A amostragem das algas perifíticas foi realizada em macrófitas aquáticas e rochas. As variáveis abióticas foram analisadas simultaneamente. A dominância de diatomáceas, cianobactérias e clorófitas, respectivamente, foi observada em todos os períodos. No período seco, as águas foram alcalinas com altas concentrações de nitrato e fósforo total associado às maiores densidades de Bacillariophyceae. Durante o período chuvoso as águas apresentaram-se mais quentes, oxigenadas e com altas concentrações de amônia e fósforo reativo solúvel. As diatomáceas permaneceram dominantes, mas com densidade reduzida, enquanto as cianobactérias e clorofíceas aumen...

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Section: Discussionmentioning

confidence: 99%

Periphytic algae dynamics in lentic ecosystems in the Brazilian semiarid

et al. 2016

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“…Qualitative analyses were performed by temporary glass slides in a binocular optical microscope, with micrometre oculars of 400x and 1000x, for species identification alone. The species identification was performed using classical literature such as Prescott (1982), Round et al (1990), Bourrelly & Couté (1991), Dillard (1991), John et al (2002), Wehr & Sheath (2003) and Bicudo & Menezes (2006) and regional studies (Fonseca & Rodrigues 2005a, Biolo & Rodrigues 2010, Bartozek et al 2013) for reference. The classification system adopted was that proposed by Round (1965Round ( , 1971).…”

Section: Methodsmentioning

confidence: 99%

Periphytic algae in a floodplain lake and river under low water conditions

et al. 2016

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Drought events will become more frequent due the climate change. In floodplains, periphytic algae are responsible for part of the primary production, are the principal source of organic carbon deposition, play an important role in mineralization and nutrient cycling, and are the base of the food web for many organisms. As algae distribution in aquatic environments is a strong indicator of physical and chemical conditions of the sites, we aimed to determine the structure of periphytic algae in lentic and lotic environments during drought conditions and to uncover the main local abiotic factors in community structuring. We hypothesized diatoms would be more frequent than green algae and desmids at both sites, due to their resistance characteristics, and that higher periphyton algal richness, density and diversity would occur in the lake due to the greater availability of nutrients and the absence of flow. The study was carried out in the Finado Raimundo lake and the Ivinhema river in the Upper Paraná river floodplain during the low water period of 2011. Petioles of the aquatic macrophyte Eichhornia azurea (Sw.) Kunth were used as a substrate for periphytic algae. We found a total of 171 species, 104 species in the lake and 80 in the river. Diatoms were predominant at both sites due to their strategic traits, and between sites, there were different patterns in the periphytic algal community structure, owing to the distinctive physical and chemical characteristics of the lake and the river. Achnanthidium minutissimum (Kützing) Czarnecki and Nitzschia palea (Kützing) W. Smith were the most abundant species in both environments. Our results showed patterns of periphytic algae in a floodplain during drought conditions, which will assist in understanding their structuring during future drought scenarios.

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“…ocorrência em literatura na planície de inundação do alto Rio Paraná: lagoa Clara e lagoa das garças (Fonseca & Rodrigues 2005a) Filamentos curvados, às vezes retos, formando massas ou tufos, bainha fina, conspícua, incolor, difluente, tricomas distintamente constrito, não granulados, célula apical arredondada, sem caliptra, células isodiamétricas, conteúdo celular homogêneo com grânulos esparsamente distribuídos; células 1-2 µm compr., 1-2 µm larg.…”

Section: Pseudanabaenaceaeunclassified

“…ocorrência em literatura na planície de inundação do alto Rio Paraná: lagoa Clara e lagoa das garças (Fonseca & Rodrigues 2005a Células pequenas, 1,1 vezes mais longas que largas, constrição mediana profunda, seno mediano linear, fechado, semicélulas transversalmente angular-ovaladas, com 5 lados, margem lateral inferior divergente, reta, para um ângulo médio arredondado, às vezes levemente pronunciado, margem superior convergente, retas a quase retas, para um ápice relativamente amplo, truncado, parede celular lisa, cloroplasto 1, pirenóide 1; células 9-18 µm compr. ; 8,5-16 µm larg.…”

Section: Pseudanabaena Moniliformisunclassified

“…Para a planície de inundação do alto Rio Paraná, a informação taxonômica das algas perifíticas, em literatura, consta em apenas duas publicações. Fonseca & Rodrigues (2005a) realizaram o levantamento das cianobactérias de dois ambientes lênticos, a partir da análise da comunidade perifítica presente no substrato Eichhornia azurea Kunth. Biolo & Rodrigues (2010) descreveram, na comunidade perifítica da macrófita Ricciocarpus natans (l.) Corda, os táxons pertencentes às classes Xanthophyceae e euglenophyceae em um ambiente semilótico da planície.…”

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