ASSEMBLY OF TERRESTRIAL HEXAPODS ON THE MARGINS OF EL SIMBOLAR STREAM

ALEXIS E. BARRIOS MONTIVERO; MORALES FRANCO L; LENCINA ISMAEL E; SALAS LILIANA B

TUCUMAN

Jornada; TUCUMAN BIOLOGY ASSOCIATION XXXVIII ANNUAL SCIENTIFIC MEETING; 2022

TUCUMAN BIOLOGY ASSOCIATION

ASSEMBLY OF TERRESTRIAL HEXAPODS ON THE MARGINS OF EL SIMBOLAR STREAMBarrios Montivero AE1,2, Morales FL1,2, Lencina IE2, Romero NR2, Barros JR2 , Salas LB21Doctoral Fellow CONICET. 2Biodiversity Center. FACEN-UNCA. Belgrano Avenue 300. 4700. Catamarca. Argentina.E-mail: lbsalas@exactas.unca.edu.arThe “El Simbolar” stream is located in Concepción, Capayán department, Catamarca. The marginal flora of the lower middle basin corresponds to the Chaco Serrano su-region with Yungas elements. Hexapods are the most diversified and abundant group among animals. They are found in all environments forming a substantial part of food chains. The objectives of this research were: to describe the assemblage of terrestrial hexapods associated with the banks of the “El Simbolar” stream, based on simple biological metrics and ecological indices and evaluate the state of conservation of the studied environment. Two sampling stations (E) of 50 m2 , were established. Fort the collection of the hexapods, 10 pitfall traps were placed, active for 28 days, renewed every seven days. Hexapods were determined by stereoscopic microscopy down to the lowest taxon possible to discern based on the available keys. In E-I 930 hexapods, from 37 taxa, were collected. The percentage composition of high-ranking taxa was: Insecta, 61.08%; Collembola, 21.5%; Isopod, 8.92%; Arachnida, 8.39%; and Chilopoda, 0.11%. The Shannon–Wiener diversity index (H’) was = 2.80. Simpson Dominance (SD) was = 0.27. In E-II, 493 hexapods of 23 taxa were collected. The percentage composition of high-ranking taxa was: Insecta, 60.65%; Isopod, 15.82%; Collembola,14.00%; Arachnida, 9.33%; and Chilopoda, 0.2%. H’ = 2.71; DS = 0.26. Formicidae was dominant in both stations (48.92% and 46.86%, respectively). The Sorensen quantitative similarity coefficient was = 0.68, with 19 common taxa. The surveyed environments are in a good state of conservation.