99 Marco Alésio Figueiredo Pereira, Tatiana Moraes da Silva Heck, Fabiano Costa de Oliveira, Rodrigo Staggemeier, Daniela Müller de Quevedo e Sabrina Esteves de Matos Almeida understand the dispersion dynamics of circulating viruses in water resources (Hunter, 2003; Ebi et al., 2006; Hata et al., 2014; Victoria et al., 2014). Although there are several studies that approach the presence of AdV as bioindicators (Oliveira et al., 2012; Vecchia et al., 2012; Fongaro et al., 2013; Bergamaschi et al., 2015; Dalla Vecchia et al., 2015; Rodrigues et al., 2015; Silva et al., 2015; Tahmasebi et al., 2020; Demoliner et al., 2021) in Brazil due to their spatial magnitude, there are still several watersheds that need to study their environmental conditions, especially to better understand the relationships between abiotic factors and fecal contamination. In this sense, this work presents an analysis between the presence of Human Mastadenovirus (HAdV) type C serotypes 2 e 5 – HAdV-C (2 and 5) and type F serotypes 40 e 41 – HAdV-F (40 and 41), as well as bovine Mastadenovirus (BAdV) suspended on the water’s blade of river, correlating them with the antecedent precipitation, flow of the water body, water temperature, and soil use around the sampled points. For this, samples used for analysis were collected on the water’s blade of river in the lower third of the Caí River Watershed, located in Rio Grande do Sul state, south of Brazil. 2. MATERIALS AND METHODS 2.1 Caí River Watershed (CRW) CRWhas an area of approximately 4,978 km2 and is located in the northeast of the Rio Grande do Sul state, Brazil, between the geodesic coordinates 29°06’ at 30°00’ S and 50°24’ at 51°40’ W, Figure 1. Its headwaters occur at about 1,000 m of altitude and its mouth is around 15 m, in Lake Guaíba. The watershed is composed of 42 municipalities, some of which have the entire territory within it. At the study level, it is divided into three stretches (high, medium and low), in which the high stretch is characterized by high altitudes and flat areas. In the middle stretch is the most urbanized and industrialized portion, with more rugged relief with slopes of great slope. The low section has flat relief and lower altitudes, marked by the occurrence of floods (Sema, 2010; Comitê Caí, 2013). In this work, monitoring was carried out on the low section, covering a length of 98.5 km. The points were selected based on
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