Influência do gradiente longitudinal (rio-barragem) na similaridade das comunidades de desmídias perifíticas

Felisberto, Sirlene Aparecida; Rodrigues, Liliana

doi:10.1590/s0100-84042005000200005

Cited by 17 publications

(19 citation statements)

References 12 publications

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“…density and water transparency. This correlation is consistent with the findings of Felisberto and Rodrigues (2005), Martins and Fernandes (2007), Cavati and Fernandes (2008) for lakes and reservoirs in southeastern Brazil.…”

Section: Discussionsupporting

confidence: 92%

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Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Oliveira

Peret

2011

Braz. J. Biol.

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The limnological features and the phytoplankton community of the Cachoeira Dourada reservoir were analyzed in December 2006, May 2007 and November 2007. Temporal changes in the taxonomic composition, density, diversity and dominance of species were analyzed in relation to climatic factors and the physical and chemical characteristics of the water. A positive correlation was found between some of the physical and chemical variables and the phytoplankton community. According to the CCA, variables such as the extent of the euphotic zone, temperature, pH, nitrogen and phosphorus concentrations directly affected the phytoplankton dynamics. Organisms belonging to the class Cyanophyceae were the most representative in all the sampling periods, comprising the functional groups K, S1, M and H. Hydrodynamics and seasonal fluctuations of environmental factors were the driving forces determining the composition and abundance of the algal assemblages. Despite the prevalence of Cyanobacteria, the reservoir is still oligotrophic. The absence of blooms and the relatively low population abundances indicated that the quality of the reservoir's water still lies within the limits required for its multiples uses.Keywords: Cachoeira Dourada, phytoplankton ecology, tropical reservoir, algal community. Estrutura da comunidade fitoplanctônica do reservatório de Cachoeira Dourada, GO/MG, Brasil ResumoAs características limnológicas e a comunidade fitoplanctônica do reservatório de Cachoeira Dourada foram analisadas nos meses de dezembro de 2006, maio de 2007 e novembro de 2007. As flutuações temporais na composição taxonômica, densidade, diversidade e dominância de espécies foram analisadas em relação aos fatores climáticos e às variáveis físicas e químicas da água. Uma correlação positiva foi encontrada entre algumas das variáveis físicas e químicas analisadas e a comunidade fitoplanctônica. De acordo com a CCA, variáveis como a extensão da zona eufótica, temperatura, pH, nitrogênio e fósforo influenciaram diretamente na dinâmica do fitoplâncton. Organismos pertencentes à classe Cyanophyceae foram as mais representativas em todos os períodos amostrais, abrangendo os grupos funcionais K, S1, M e H. A hidrodinâmica e a variação sazonal dos fatores ambientais foram as forças determinantes da composição e abundância das assembleias de algas. Apesar do predomínio de cianobactérias, o ambiente do reservatório ainda é oligotrófico. A ausência de florações e as abundâncias populacionais relativamente baixas indicaram que a qualidade da água do reservatório continua se mantendo dentro dos limites estipulados para seus usos múltiplos.Palavras-chave: Cachoeira Dourada, ecologia de fitoplâncton, reservatório tropical, comunidade algal.

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Section: Discussionsupporting

confidence: 92%

“…These algae constitute a representative group of the periphyton, and are found mainly in environments of nutrient-poor acidic water with low electrical conductivity and high transparency (Felisberto and Rodrigues, 2005). In Cachoeira Dourada, a positive correlation was found between the Chlorophyceae (Scenedesmus sp.)…”

Section: Discussionmentioning

confidence: 99%

Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Oliveira

Peret

2011

Braz. J. Biol.

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“…Felisberto & Rodrigues (2005a, b, 2010b, 2012, Bortolini et al (2010b), Menezes et al (2011b) and Aquino et al (2014).…”

Section: Cosmarium Dispersummentioning

confidence: 99%

New records of Cosmarium Corda ex Ralfs in lotic environment, adjacent to the Iguaçu National Park, Paraná State, Brazil

Aquino

Bueno

Servat

et al. 2016

Hoehnea

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This study aimed to document the Cosmarium (Desmiadiales, Zygnematophyceae) taxa at a subtropical stream located in an area adjacent to the Iguaçu National Park, an important environmental protection area in the further west of Paraná State. For this purpose, monthly samplings of periphytic material associated to Eleocharis minima Kunth were performed in the period of August 2012 to July 2013. This taxonomic inventory allowed the identification of 37 taxa at specific and infra-specific levels. There were 15 new records for Paraná State: Cosmarium bipunctatum Börgensen, C. clepsydra Nordstedt var. bicardia (Reinsch) Croasdale, C. crenatum var. crenatum Ralfs, C. difficile Lütkemüller var. dilatatum Borge, C. isthmochondrum var. isthmochondrum Nordstedt, C.obsoletum (Hantzsch) Reinsch var. obsoletum, C. ordinatum (Borge) West & West var. ordinatum, C.ornatum Ralfs var. ornatum f. ornatum, C. pseudoconnatum Nordstedt var. pluriradians Scott & Grönblad, C. pseudoretusum F. Ducell. var. pseudoretusum Krieger et Gerlof, C. pyramidatum var. borgei Krieger & Gerloff, C. regnellii var. minimum Eichler & Gutwinski, C. repandum var. minus (West & West) Krieger & Gerloff, C. securiforme Borge var. brasiliense Grönblad and C. variolatum var. variolatum Lundell.

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“…Although it had a low value of explicability, axis 2 revealed a clear separation among seasonal periods (April and August), showing more homogeneous groups, especially in April for intermediate and Paulo: ; (Felisberto and Rodrigues, 2005a). This total taxa, 20 were distributed in the genera of Closterium (14), Gonatozygon (4), Netrium (1), and Penium (1), which ones can be seen in Table 2.…”

Section: Spatial and Temporal Characterizationmentioning

confidence: 93%

Taxonomical and ecological characteristics of the desmids placoderms in reservoir: analyzing the spatial and temporal distribution

2014

Self Cite

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Aim: This study aimed to evaluate the influence of river-dam axis and abiotic factors on the composition of Closteriaceae, Gonatozygaceae, Mesotaeniaceae and Peniaceae in a tropical reservoir. Methods: Water samples for physical, chemical and periphyton analysis were collected in April and August 2002 in different regions along the axis of the river-dam of Rosana Reservoir, River Basin Paranapanema. The substrates collected, always in the litoranea region, were petioles of Eichhornia azurea (Swartz) Kunth. To examine the relationship of abiotic variables with reservoir zones and between the floristic composition of desmids, we used principal component analysis (PCA) and canonical correspondence analysis (CCA). Results: The results of the PCA explained 81.3% of the total variability in the first two axes. In the first axis, the variables of conductivity, water temperature and the pH were related to the sampling regions of April with higher values, while for the month of August, nitrate, total phosphorus and dissolved oxygen showed higher values. We identified 20 taxa, distributed in the genera Closterium (14), Gonatozygon (4), Netrium (1) and Penium (1). Spatially, the higher taxa were recorded in the lacustrine region for both collection periods. The canonical correspondence analysis (CCA) summarized 62.2% of total data variability of taxa in the first two axes, and in August, Closterium incurvum Brébisson, C. cornu Ehrenberg ex Ralfs and Gonatozygon monotaenium De Bary, were related to higher values of turbidity and nitrate to the lacustrine and intermediate regions. Conclusion: Thus, the formation of groups was due to the regions along the longitudinal axis, then the seasonal period, which must be related to the low current velocity, the higher values of temperature and the water transparency, especially in late summer.

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Influência do gradiente longitudinal (rio-barragem) na similaridade das comunidades de desmídias perifíticas

Cited by 17 publications

References 12 publications

Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

Structure of the phytoplankton community in the Cachoeira Dourada reservoir (GO/MG), Brazil

New records of Cosmarium Corda ex Ralfs in lotic environment, adjacent to the Iguaçu National Park, Paraná State, Brazil

Taxonomical and ecological characteristics of the desmids placoderms in reservoir: analyzing the spatial and temporal distribution

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