Diversidade de cianobacterérias nas áreas da lagoa d Casamento e dos Butiazais de Tapes e seus ecossistemas associados (RS, Brasil)
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Data
2010-03-04
Autores
Martins, Mariéllen Dornelles [UNESP]
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Editor
Universidade Estadual Paulista (Unesp)
Resumo
As cianobactérias são dotadas de grande variabilidade morfológica e plasticidade ecológica e estão adaptadas aos mais diversos ambientes e regiões geográficas. O conhecimento taxonômico do grupo no Brasil ainda é restrito e concentrado principalmente no estado de São Paulo. Lagoas e banhados costeiros constituem hábitats de interesse científico, pois podem abrigar espécies não encontradas em outras condições ambientais e fornecer informações importantes do ponto de vista taxonômico, ecológico e evolutivo. A planície costeira do Rio Grande do Sul apresenta uma forte dominância de ecossistemas de áreas úmidas, destacandose entre eles, lagoas e lagunas de água doce e banhados. O objetivo deste estudo consiste no levantamento e estudo taxonômico das cianobactérias ocorrentes em ambientes aquáticos na área da lagoa do Casamento e ecossistemas associados, assim como na área dos butiazais (formação vegetal dominada pela palmeira butiá, Butia capitata (Martius) Beccari) nos arredores da cidade de Tapes. Os resultados obtidos baseiam-se na análise de 90 amostras de plâncton e espremidos de macrófitas que foram coletadas em maio, junho, outubro, novembro e dezembro de 2003, em 28 pontos das áreas (incluindo diferentes habitats como lagoas, banhados e sangradouro). Foram identificados 92 táxons específicos de cianobactérias, pertencentes a 39 gêneros. Synechococcophycidae foi representada por 34 espécies (37%), Oscillatoriophycidae por 33 espécies (36%) e Nostocophycidae por 25 espécies (27%). Entre as espécies identificadas, 24 (26%) são novas ocorrências para o Rio Grande do Sul. Três táxons foram identificados em nível genérico e provavelmente constituirão novos táxons para a ciência. Phormidium foi o gênero que apresentou o maior número de espécies identificadas (8), seguido de Aphanocapsa, Chroococcus e Oscillatoria (7 cada um)...
Cyanobacteria have wide morphological diversity and ecological plasticity and are adapted to different environments and geographic regions. The taxonomic knowledge of the group in Brazil is still limited and it is mainly concentrated in the São Paulo State. Additionally, coastal lagoons and wetlands are habitats of scientific interest because they may harbor species not found in other environmental conditions and provide important information in terms of taxonomic, ecological and evolutionary. The coastal plain of the Rio Grande do Sul State has a strong dominance of wetland ecosystems, especially lakes and freshwater lagoons and marshes. The aim of this paper is the taxonomic study of the cyanobacteria in aquatic environments in the areas of Casamento lagoon and of the butiazais (vegetation mainly composed by the palm tree Butia capitata (Martius) Beccari) around Tapes City, as well as associated ecosystems. Results are based on the analysis of 90 samples obtained during the project “Assessment of the biodiversity of the Casamento lagoon and butiazais areas, coastal plain of Rio Grande do Sul State”. Samples of plankton and squeezing submerged parts of aquatic macrophytes were collected in May, June, October, November and December 2003, in 28 sites (including different habitats such as ponds, wetlands and spillway). Ninety two specific taxa, belonging to 39 genera, were identified. Synechococcophycidae was represented by 34 species (37%), Oscillatoriophycidae by 33 species (36%) and Nostocophycidae, by 25 species (25%). Among the identified species, 24 (26%) are firstly recorded for Rio Grande do Sul State. Three taxa were identified only at generic level and are probably new to science. Phormidium was the genus which presented the highest number of identified species (8), followed by Aphanocapsa, Chroococcus and Oscillatoria (with 7 species each). Geitlerinema... (Complete abstract click electronic access below)
Cyanobacteria have wide morphological diversity and ecological plasticity and are adapted to different environments and geographic regions. The taxonomic knowledge of the group in Brazil is still limited and it is mainly concentrated in the São Paulo State. Additionally, coastal lagoons and wetlands are habitats of scientific interest because they may harbor species not found in other environmental conditions and provide important information in terms of taxonomic, ecological and evolutionary. The coastal plain of the Rio Grande do Sul State has a strong dominance of wetland ecosystems, especially lakes and freshwater lagoons and marshes. The aim of this paper is the taxonomic study of the cyanobacteria in aquatic environments in the areas of Casamento lagoon and of the butiazais (vegetation mainly composed by the palm tree Butia capitata (Martius) Beccari) around Tapes City, as well as associated ecosystems. Results are based on the analysis of 90 samples obtained during the project “Assessment of the biodiversity of the Casamento lagoon and butiazais areas, coastal plain of Rio Grande do Sul State”. Samples of plankton and squeezing submerged parts of aquatic macrophytes were collected in May, June, October, November and December 2003, in 28 sites (including different habitats such as ponds, wetlands and spillway). Ninety two specific taxa, belonging to 39 genera, were identified. Synechococcophycidae was represented by 34 species (37%), Oscillatoriophycidae by 33 species (36%) and Nostocophycidae, by 25 species (25%). Among the identified species, 24 (26%) are firstly recorded for Rio Grande do Sul State. Three taxa were identified only at generic level and are probably new to science. Phormidium was the genus which presented the highest number of identified species (8), followed by Aphanocapsa, Chroococcus and Oscillatoria (with 7 species each). Geitlerinema... (Complete abstract click electronic access below)
Descrição
Palavras-chave
Ficologia, Fitopatologia, Microorganismos fitopatogenicos, Cianobacteria, Biodiversidade, Diversidade biológica, Phytopathology
Como citar
MARTINS, Mariéllen Dornelles. Diversidade de cianobacterérias nas áreas da lagoa d Casamento e dos Butiazais de Tapes e seus ecossistemas associados (RS, Brasil). 2010. 228 f. Dissertação (mestrado) - Universidade Estadual Paulista, Instituto de Biociências, Letras e Ciências Exatas, 2010.