SURVEY OF A SUBTROPICAL RIVER UNDER THE EFFECTS OF THE CLIMATIC PHENOMENON ?EL NIÑO?

TANNURÉ FM; JUÁREZ LEIBOVICH MC; ARGAÑARAZ CM; CARRIZO WD; SAADE LS; ALBERTI P; LEYRIA N; ROTGER A; GROSSO DALUZ L; JUAN C. GONZALEZ

Tafi Viejo

Encuentro; XXXVI Jornadas Científicas ABT; 2019

Asociación de Biología de Tucumán

The systematic destruction of aquatic ecosystems leads to redouble studies on their functioning. Benthic macroinvertebrates, respond quickly to environmental variations, reflecting the degree of ecological integrity of the system. The biotic indices (IB) are a tool based on the sensitivity of several groups to pollutants, and allow to express a measure of the biological quality of a river using numerical values. Abrupt changes in the flow rate will be observed as changes in the Richness of fish. Students of Limnologia (Fac. De Cs. Nat, UNT) approach a field work and use what they have learned to apply in the Lules River. Objectives: To know and analyze physicochemical and biological parameters in a section of the Lules river during the dry season of the year 2019 and in the last month of the climatic phenomenon ?El Niño?, and compare the results with those obtained in other works carried out in the years 2005 -2007. Physicochemical parameters, macrobenthic samples using D-network, and ichthyological samples were measured by electric fishing. The Taxa Richness of macroinvertebrate was averaged at 8 (lower than expected) and the quality of the river with an IBY4 index was ?very good?. The fish community presented variations only in the diversity of species, the specimens found are characteristic of the dry season. We infer that the results are coincident with what was expected because the samples were collected at the end of the climatic phenomenon. Even so, they presented interesting variations, which we point out in this work.