River pollution Rivers Santiago-Guadalajara River Santiago-guadalajarum river Water quality Water quality indexes Annual cycle Aquatic ecosystems Aquatic life Aquatic organisms Classification algorithm Ecosystem-specific water quality index Ecosystems Forecasting Index predictions Jalisco Land use Land uses Linear regression Me-xico Mexico [North America] Multiple linear regression models Multivariant analysis Novel methods Parameter estimation Protection of aquatic life Quality assurance Quality control Regression algorithms Sampling