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The Piraquara river basin (Upper Iguaçu River basin - Brazil) was studied as an ecological system throughout a complete seasonal cycle, comprising the rainy and dry season. Analyzes of 16 physical and chemical water variables (dissolved oxygen, biochemical oxygen demand, temperature, pH, conductivity, total nitrogen, total phosphorus, ortophosphates, nitrite, nitrate, ammonium, reagent silicate, total suspended solids, chlorophyll - a, flow velocity and depth) showed correlations between water composition and watershed physiographic features, and the Principal Component Analysis allowed to evidence spatial gradients and seasonal differences. The sampling points were clustered in patches with homogeneous behavior, according to ecologycal concepts: patch 1, with strong influence of Serra do Mar mountains; patch 2, medium course, under Piraquara Dam influence and patch 3, under wetlands influence. Two main factors of serial discontinuity were identified: the Piraquara dam effect and the influence of wetlands. The watershed zoning based on limnological characteristics seeks to subsidize research and biomonitoring for this public springs area. A bacia hidrográfica do rio Piraquara (Bacia do Alto Rio Iguaçu - PR) foi estudada como sistema ecológico ao longo de um ciclo sazonal completo, abrangendo os períodos seco e chuvoso. Análises de 16 variáveis físicas e químicas da água (oxigênio dissolvido, pH, condutividade, DBO5, temperatura, nitrogênio total, fósforo total, ortofosfato, nitrito, nitrato, amônio, silicato, sólidos totais em suspensão, clorofila-a, profundidade e velocidade da corrente) demonstraram correlações entre a composição da água e as características fisiográficas da bacia. Os gradiente espaciais e as diferenças sazonais foram evidenciadas pela Análise de Componentes Principais, e a bacia foi dividida em trechos de comportamento homogêneo, sendo identificadas descontinuidades seriais: Trecho 1, com forte influência da Serra do Mar; Trecho 2, curso médio do rio, sob influência da Represa do Piraquara e Trecho 3, sob influência das várzeas. O trabalho Pretende subsidiar ações de pesquisa, planejamento e biomonitoramento para este manancial público

Limnological study of Piraquara river (Upper Iguaçu basin): spatiotemporal variation of physical and chemical variables and watershed zoning