Time-Series Analysis of Oxygen as an Important Environmental Parameter for Monitoring Diversity Hotspot Ecosystems: An Example of a River Sinking into the Karst Underground

Predicting variations in dissolved oxygen concentration (DO) is important for management and environmental monitoring of aquatic ecosystems. Regression analyses univariate multivariate time-series based on autoregressive methods were performed to investigate conditions the Pivka River, Slovenia. The site was established upstream where river sinks into karst cave Postojnska jama, which hosts one richest subterranean faunas yet studied worldwide. It found that abnormal DO started be noticeable at values < 3 mg/L became more pronounced until ecosystem reached fully anoxic conditions. fluctuations during critical summer period due conditions, organic load resident biota. Predictions future detection anomalies made from stable residuals measured data, it demonstrated model could used obtain a reliable estimate short period, such as day. example presented an analysis pipeline specific threshold values, particularly ecosystems with diversity hotspots prolonged low can pose threat their