Resumo: As cianobactérias e as microalgas compõem um grupo bastante diversificado e exibem diversas diferenças morfológicas, bioquímicas e fisiológicas. O conhecimento desses organismos que habitam as águas epicontinentais no Brasil é extremamente heterogêneo em relação à região geográfica e ao grupo taxonômico. Taxonomicamente, há muito mais conhecimento sobre as algas das regiões Sul e Sudeste do país do que sobre as algas das regiões Norte e Centro-Oeste. Portanto, esta pesquisa apresenta um conhecimento revisado e atualizado das algas que ocorrem no Parque Nacional da Chapada dos Guimarães (PNCG) e arredores. Nossa área de estudo está localizada no estado de Mato Grosso, na região centro-oeste do Brasil. O banco de dados foi obtido a partir de literatura publicada relacionada a inventários taxonômicos e ecológicos, assim como novas coletas realizadas na área. Os métodos de coletas foram bastante diversos de modo que abrangesse todo tipo de organismos, no plâncton, perifíton, massas filamentosas, lodo e água acumulada em bromélias, as novas coletas são amostras coletadas exclusivamente no plâncton. Foram listados 182 táxons, distribuídos em 83 gêneros, 45 famílias, 11 classes e sete divisões taxonômicas. No total, 89 táxons foram encontrados nas novas amostragens realizadas, destes, nove táxons, já haviam sido registrados na literatura existente, portanto 80 táxons são novos registros para a região. Um grande número de táxons citados anteriormente na literatura, não foram registrados nos ambientes amostrados, na sua grande maioria constituído por Bacillariophyceae, Conjugatophyceae e Euglenophyceae. Como também foram registradas três espécies de cianobactérias de grande importância sanitária. Sendo assim o PNCG possui grande importância na manutenção da biodiversidade aquática e conhecer essa comunidade torna-se cada vez mais importante para embasar medidas de manejo.

Abstract: Cyanobacteria and microalgae make up a very diverse group and exhibit diverse morphological, biochemical and physiological differences. The knowledge of these organisms that inhabit epicontinental waters in Brazil is extremely heterogeneous in relation to the geographic region and the taxonomic group. Taxonomically there is much more knowledge about the algae of the South and Southeast regions of the country than there is about the algae of the North and Central-West regions. Therefore, this research presents a revised and updated knowledge of the algae that occur in the National Park of the Chapada dos Guimarães (PNCG) and surrounding areas. Our area of study is located in the state of Mato Grosso, in the center-west region of Brazil. The database was obtained from published literature related to taxonomic and ecological inventories, as well as new collections carried out in the area. The collection methods were quite diverse to cover all types of organisms, in plankton, periphyton, filamentous masses, sludge and water accumulated in bromeliads, the new collections are samples collected exclusively in the plankton. They were listed 182 taxa, distributed in 83 genera, 45 families, 11 classes and seven taxonomic divisions. In total, 89 taxa were found in the new samplings, of which nine taxa were already registered in the existing literature, so 80 taxa are new records for the region. A large number of taxa previously mentioned in the literature were not recorded in the sampled environments, most of them composed of Bacillariophyceae, Conjugatophyceae and Euglenophyceae. As well as three species of cyanobacteria of great sanitary importance were registered. Therefore, CGNP has great importance in the maintenance of aquatic biodiversity and to know this community becomes increasingly important to support management measures.

A preliminary analyses of the possible contamination of superficial and underground water by the active ingredients of the pesticide products used in the surroundings of the urban area of Primavera do Leste, Mato Grosso, Brazil, was carried out. A description of the study region and of its environmental characteristics, which can favor the contamination of the local aquatic environment, was presented. The EPA screening criteria, the groundwater ubiquity score (GUS) and the criteria proposed by Goss were used to evaluate which pesticides might contaminate the local waters. Among the active ingredients studied, several present risks to the local aquatic environment.