This work sought the survey of species and information about the distribution of the Class Oligochaeta in reservoirs sampled in the Sediment Quality Monitoring Network of CETESB (Environmental Company of the State of São Paulo). As such, this study aimed to inventory the limnic oligochaetes fauna to expand knowledge of the ecology and distribution of this group in reservoirs in the state of São Paulo. Ninety replicates were performed in 12 reservoirs in the state of São Paulo between 2014 and 2016, using van Veen or Ponar samplers in the sublittoral region, and Ekman-Birge in the deep region. Twenty-eight taxa were inventoried, belonging to the families Naididae and Opistocystidae. The species Dero righii and Pristina longisoma were recorded for the first time in São Paulo State, Nais magnaseta and Spirosperma velutina were first recorded in Brazil. The results presented here make this inventory extremely important for understanding the distribution of aquatic oligochaetes throughout the Brazilian territory.
Aquatic worms are considered a suitable group to evaluate the effects of contaminants in the environment, although one of the main challenges is using native species. Recently, Pristina longiseta was suggested to be used in acute bioassays for tropical regions. In this context, the aim of this study was to establish a chronic exposure for ecotoxicological bioassays utilizing the tropical native species P. longiseta. Firstly, we tested three exposure times (96h, 7d, and 10d) in the presence and absence of aeration. After determining the best con guration, we evaluated the effects of the chronic exposures using the standardized reference substance potassium chloride, the antibiotic sulfamethoxazole, the ame retardant tetrabromobisphenol-A, and sugarcane vinasse. Our results showed the suitability for applying the chronic exposure using P. longiseta and indicated the sensitivity of the offspring to KCl (EC50 = 0.51 g/L). Sulfamethoxazole and TBBPA caused a signi cant reduction in the offspring of P. longiseta (EC50 = 59.9 µg/L and 166.1 µg/L, respectively). Sugarcane vinasse showed high toxicity for the species, and a fraction of 4.26% of vinasse was calculated as EC50. Therefore, the described protocol was successfully applied as an ecotoxicological assessment to evaluate the effects of contaminants on the reproduction rate of the freshwater worm P. longiseta.
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