Average concentrations of phosphate (a) and nitrate (b) measured in each sampled sub-basins (Level 10 HydroBasins on y axis) in Buenos Aires, Curitiba, Mexico City, Rio de Janeiro, São Paulo and Vancouver. A. LoiselleSteven CunhaDavi Gasparini Fernandes ShupeScott ValienteElsa RochaLuciana HeasleyEleanore BelmontPatricia Pérez BaruchAvinoam 2016 <p>Bars indicate 2 standard errors (SE).</p>