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The Regime of Oxygen and Nutrients in St. Ana Lake. St Ana Lake is located in Ciomad crater, the youngest formation of the volcanic chain that timbers the Carpathians. The lake is exclusively supplied with rainfall, as there are no flowing waters inside the crater. For this reason, the quantity of mineral substances dissolved in water is very small. All these characteristics influence the physical, chemical and biological parameters of the water. The temporal differentiations of the oxygen and nutrients’ regime are small. The period of analysis extends between 2000-2004, and the control points are at northern and southern ends and in the centre. The analyses refer to dissolved oxygen, saturation in oxygen, the biochemical consumption of oxygen, the chemical consumption of oxygen, nitrate, nitrite, ammonium, total mineral nitrogen, phosphate, total phosphorus and phytoplankton.

Key words: St. Ana Lake, physical, chemical and biological features, oxygen, nutrients, eutrophication, state of the water