Os inventários de espécies fornecem amplo conhecimento sobre a distribuição, ecologia e riqueza dos táxons tornando-o uma ferramenta importante para programas de conservação de biodiversidade e gestão dos ecossistemas. Os organismos inventariados neste estudo são pertencentes à classe Oligochaeta, um importante táxon da fauna aquática continental e um dos grupos mais importantes na ciclagem de matéria orgânica nos ecossistemas de água doce. Dessa forma, este estudo tem como objetivo realizar o levantamento das espécies de Oligochaeta em três córregos urbanos (Córrego Himalaia, Ribeirão da Bocaina e Córrego Bocaina) do município de Bocaina, localizado na região central do estado de São Paulo. Para isso, as amostras de sedimento foram coletadas em sete pontos com o auxílio de uma rede (malha 0,25 mm) pelo método de varredura. O material coletado foi triado para obtenção dos organismos, fixado com formalina 10% e identificado até nível de espécie. Foram registrados 20 táxons de um total de 1395 organismos, distribuídos em 10 gêneros (Allonais, Aulophorus, Bothrioneurum, Brinkhurstia, Dero, Limnodrilus, Nais, Opistocysta, Pristina e Slavina) e 4 famílias: Família Naididae Opistocystidae, Alluroididae e Enchytraeidae. Assim, o presente inventário obteve uma riqueza de 20 táxons, representando aproximadamente 23% das 86 espécies registradas em ecossistemas aquáticos brasileiros. Por fim, muitos estudos ainda precisam ser realizados para fornecer dados mais completos sobre a distribuição e ecologia desse táxon, para enfatizar sua importância como bioindicadores de qualidade da água e para manutenção do equilíbrio ecológico em ambientes aquáticos.

Abstract:Oligochaeta is one of the most common and abundant taxon in continental aquatic fauna. However, knowledge of their distribution in Brazilian ecosystems is still incomplete and fragmented. Thus, the aim of this study was to develop an inventory of aquatic oligochaetes in the Extractive Reserve of Lake Cuniã in the State of Rondônia, Brazil. Collections of data were performed during the dry (August 2015) and rainy seasons (February 2016). The sediment samples were collected near the lakeside region using the kick sampling method and a kick-net sampler (mesh size of 0.25mm). This paper provides a catalog with 12 taxon from a total of 383 specimens, distributed into two families: Naididae (95.08%) and Opistocystidae (4.92%). The Pristininae subfamily was the most significant (85.68%), followed by subfamilies: Naidinae (8.36%), Tubificinae (0.52%) and Rhyacondrilinae (0.52%). In addition, some species such as Allonais inaequalis, Aulophorus furcatus, Dero nivea, Pristina synclites, Pristina menoni and Opistocysta serrata, were recorded for the first time in the Brazilian Amazon region. Therefore, the results of this study contribute to increase knowledge on the distribution of the Oligochaeta class in Brazil, particularly in the North of the country, which is so extensive and rich in water resources, but not extensively studied. Keywords

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Freshwater invertebrates occupy important roles in ecological processes and are frequently used as indicators of water quality. Their existence, however, is still obscure in many regions of the country, i.e. very few relevant studies have been conducted regarding their presence especially in the Amazon region. Thus, this study aimed to present an inventory of aquatic macroinvertebrates from the marginal region of an Amazonian lake. This study was conducted in a floodplain area, at the Extractivist Reserve of Cuniã Lake (margin of the Madeira River).To sample macrofauna, were collected sediment and aquatic macrophytes near the marginal region in seven sites during low-water season (August 2015) and the high-water season (February 2016). The environmental variables (water temperature (ºC), electric conductivity (μS /cm), pH, and dissolved oxygen (mg/L) were measured at each site and concentrations of organic matter in the sediment were also determined. A total of 28 taxa were recorded. The most significant taxa for the lake were the genera: Campsurus (Ephemeroptera: Polymitarcydae) and Tenagobia (Hemiptera: Corixidae. The lake presents diverse macrofauna, indicating good environmental quality and organic enrichment, which highlights the importance of flood in composition of local macrofauna.

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