BEHAVIOR OF PHYSICAL AND CHEMICAL PARAMETERS AS INDICATORS OF WATER QUALITY AND TROPHIC LEVEL OF LA PALAPA MICRORESERVOIR, MORELOS, MEXICO (Atena Editora)

Abstract

Microreservoirs (also called “bordos”) are shallow aquatic environments with maximum depths between one and five meters, affected by the rainy season and have been considered eutrophic systems in the dilution season and hypertrophic in the concentration stage, in climates warm. The objective of this work is to determine the water quality and the trophic level during the rainy and dry seasons in the La Palapa microreservoir and to analyze the relationship between the physical and chemical variables of the water in the aquatic system. Due to the health contingency caused by the SARS-CoV-II (COVID 19) pandemic, the data was collected from a database of the Limnology laboratory, from February 2019 to February 2020. The water samples from two stations monitoring, were taken with a Van Dorn bottle for the analysis of physical and chemical variables of the water of the aquatic system. The results showed that La Palapa can be considered as a continuous warm polymictic system, with water temperatures between 18 and 30°C, well oxygenated waters (>5 mg/L), very hard and productive (>40 mg/L CaCO3). Presents eutrophication processes, due to excessive enrichment by phosphorus and nitrogen, which allows proliferation of photosynthetic organisms, with a tendency to hypereutrophication, without significant differences between the rainy and dry seasons, and based on the different state indices used, no differences were observed in the behavior of the system between them, mainly due to the shallowness of the aquatic environment. It was determined that the hot dry season covers from mid-March to mid-June, the rainy season from late June to early November, and the cold dry season from early November to late February. The water from the “bordo” La Palapa is within the permissible limits of water quality according to regulations, so its use is suitable for carrying out agricultural and fishing activities.